## org.mozilla.javascript
Class ScriptableObject

    java.lang.Object
      org.mozilla.javascript.ScriptableObject

All Implemented Interfaces:
  java.io.Serializable, ConstProperties, DebuggableObject, Scriptable

Direct Known Subclasses:
  IdScriptableObject, NativeJavaPackage

    public abstract class ScriptableObject

extends java.lang.Object
implements Scriptable, java.io.Serializable, DebuggableObject, ConstProperties

This is the default implementation of the Scriptable interface. This class provides convenient default behavior that makes it easier to define host objects.

Various properties and methods of JavaScript objects can be conveniently defined using methods of ScriptableObject.

Classes extending ScriptableObject must define the getClassName method.

Author:
  Norris Boyd
See Also:
  `Scriptable`, Serialized Form

Field Summary
`static int` `CONST`
`static int` `DONTENUM` Property attribute indicating property is not enumerated.
`static int` `EMPTY` The empty property attribute.
`static int` `PERMANENT` Property attribute indicating property cannot be deleted.
`static int` `READONLY` Property attribute indicating assignment to this property is ignored.
`static int` `UNINITIALIZED_CONST` Property attribute indicating that this is a const property that has not been assigned yet.

Fields inherited from interface org.mozilla.javascript.Scriptable
`NOT_FOUND`

Constructor Summary
`ScriptableObject()`
`ScriptableObject(Scriptable scope, Scriptable prototype)`

Method Summary
`protected int` `applyDescriptorToAttributeBitset(int attributes, ScriptableObject desc)`
`java.lang.Object` `associateValue(java.lang.Object key, java.lang.Object value)` Associate arbitrary application-specific value with this object.
`boolean` `avoidObjectDetection()` Emulate the SpiderMonkey (and Firefox) feature of allowing custom objects to avoid detection by normal "object detection" code patterns.
`protected static ScriptableObject` `buildDataDescriptor(Scriptable scope, java.lang.Object value, int attributes)`
`static java.lang.Object` `callMethod(Context cx, Scriptable obj, java.lang.String methodName, java.lang.Object[] args)` Call a method of an object.
`static java.lang.Object` `callMethod(Scriptable obj, java.lang.String methodName, java.lang.Object[] args)` Call a method of an object.

`static

`<T extends Scriptable> void`

`

`defineClass(Scriptable scope, java.lang.Class<T> clazz)`
Defines JavaScript objects from a Java class that implements Scriptable.

`static

`<T extends Scriptable> void`

`

`defineClass(Scriptable scope, java.lang.Class<T> clazz, boolean sealed)`
Defines JavaScript objects from a Java class, optionally allowing sealing.

`static

`<T extends Scriptable> java.lang.String`

`

`defineClass(Scriptable scope, java.lang.Class<T> clazz, boolean sealed, boolean mapInheritance)`
Defines JavaScript objects from a Java class, optionally allowing sealing and mapping of Java inheritance to JavaScript prototype-based inheritance.

`void` `defineConst(java.lang.String name, Scriptable start)` Reserves a definition spot for a const.
`static void` `defineConstProperty(Scriptable destination, java.lang.String propertyName)` Utility method to add properties to arbitrary Scriptable object.
`void` `defineFunctionProperties(java.lang.String[] names, java.lang.Class<?> clazz, int attributes)` Search for names in a class, adding the resulting methods as properties.
`void` `defineOwnProperties(Context cx, ScriptableObject props)`
`void` `defineOwnProperty(Context cx, java.lang.Object id, ScriptableObject desc)` Defines a property on an object Based on [[DefineOwnProperty]] from 8.12.10 of the spec
`static void` `defineProperty(Scriptable destination, java.lang.String propertyName, java.lang.Object value, int attributes)` Utility method to add properties to arbitrary Scriptable object.
`void` `defineProperty(java.lang.String propertyName, java.lang.Class<?> clazz, int attributes)` Define a JavaScript property with getter and setter side effects.
`void` `defineProperty(java.lang.String propertyName, java.lang.Object value, int attributes)` Define a JavaScript property.
`void` `defineProperty(java.lang.String propertyName, java.lang.Object delegateTo, java.lang.reflect.Method getter, java.lang.reflect.Method setter, int attributes)` Define a JavaScript property.
`void` `delete(int index)` Removes the indexed property from the object.
`void` `delete(java.lang.String name)` Removes a named property from the object.
`static boolean` `deleteProperty(Scriptable obj, int index)` Removes the property from an object or its prototype chain.
`static boolean` `deleteProperty(Scriptable obj, java.lang.String name)` Removes the property from an object or its prototype chain.
`protected Scriptable` `ensureScriptable(java.lang.Object arg)`
`protected ScriptableObject` `ensureScriptableObject(java.lang.Object arg)`
`protected java.lang.Object` `equivalentValues(java.lang.Object value)` Custom `==` operator.
`java.lang.Object` `get(int index, Scriptable start)` Returns the value of the indexed property or NOT_FOUND.
`java.lang.Object` `get(java.lang.Object key)`
`java.lang.Object` `get(java.lang.String name, Scriptable start)` Returns the value of the named property or NOT_FOUND.
`java.lang.Object[]` `getAllIds()` Returns an array of ids for the properties of the object.
`static Scriptable` `getArrayPrototype(Scriptable scope)`
`java.lang.Object` `getAssociatedValue(java.lang.Object key)` Get arbitrary application-specific value associated with this object.
`int` `getAttributes(int index)` Get the attributes of an indexed property.
`int` `getAttributes(int index, Scriptable start)` Deprecated. Use `getAttributes(int index)`. The engine always ignored the start argument.
`int` `getAttributes(java.lang.String name)` Get the attributes of a named property.
`int` `getAttributes(java.lang.String name, Scriptable start)` Deprecated. Use `getAttributes(String name)`. The engine always ignored the start argument.
`abstract java.lang.String` `getClassName()` Return the name of the class.
`static Scriptable` `getClassPrototype(Scriptable scope, java.lang.String className)` Get the prototype for the named class.
`java.lang.Object` `getDefaultValue(java.lang.Class<?> typeHint)` Implements the [[DefaultValue]] internal method.
`static java.lang.Object` `getDefaultValue(Scriptable object, java.lang.Class<?> typeHint)`
`static Scriptable` `getFunctionPrototype(Scriptable scope)` Get the Function.prototype property.
`java.lang.Object` `getGetterOrSetter(java.lang.String name, int index, boolean isSetter)` Get the getter or setter for a given property.
`java.lang.Object[]` `getIds()` Returns an array of ids for the properties of the object.
`static Scriptable` `getObjectPrototype(Scriptable scope)` Get the Object.prototype property.
`protected ScriptableObject` `getOwnPropertyDescriptor(Context cx, java.lang.Object id)`
`Scriptable` `getParentScope()` Returns the parent (enclosing) scope of the object.
`static java.lang.Object` `getProperty(Scriptable obj, int index)` Gets an indexed property from an object or any object in its prototype chain.
`static java.lang.Object` `getProperty(Scriptable obj, java.lang.String name)` Gets a named property from an object or any object in its prototype chain.
`static java.lang.Object[]` `getPropertyIds(Scriptable obj)` Returns an array of all ids from an object and its prototypes.
`Scriptable` `getPrototype()` Returns the prototype of the object.
`protected org.mozilla.javascript.ScriptableObject.Slot` `getSlot(Context cx, java.lang.Object id, int accessType)`
`static Scriptable` `getTopLevelScope(Scriptable obj)` Get the global scope.
`static java.lang.Object` `getTopScopeValue(Scriptable scope, java.lang.Object key)` Get arbitrary application-specific value associated with the top scope of the given scope.

`static

`<T> T`

`

`getTypedProperty(Scriptable s, int index, java.lang.Class<T> type)`
Gets an indexed property from an object or any object in its prototype chain and coerces it to the requested Java type.

`static

`<T> T`

`

`getTypedProperty(Scriptable s, java.lang.String name, java.lang.Class<T> type)`
Gets a named property from an object or any object in its prototype chain and coerces it to the requested Java type.

`java.lang.String` `getTypeOf()` Gets the value that will be returned by calling the typeof operator on this object.
`boolean` `has(int index, Scriptable start)` Returns true if the property index is defined.
`boolean` `has(java.lang.String name, Scriptable start)` Returns true if the named property is defined.
`boolean` `hasInstance(Scriptable instance)` Implements the instanceof operator.
`static boolean` `hasProperty(Scriptable obj, int index)` Returns whether an indexed property is defined in an object or any object in its prototype chain.
`static boolean` `hasProperty(Scriptable obj, java.lang.String name)` Returns whether a named property is defined in an object or any object in its prototype chain.
`protected boolean` `isAccessorDescriptor(ScriptableObject desc)`
`boolean` `isConst(java.lang.String name)` Returns true if the named property is defined as a const on this object.
`protected boolean` `isDataDescriptor(ScriptableObject desc)`
`boolean` `isEmpty()`
`boolean` `isExtensible()`
`protected static boolean` `isFalse(java.lang.Object value)`
`protected boolean` `isGenericDescriptor(ScriptableObject desc)`
`protected boolean` `isGetterOrSetter(java.lang.String name, int index, boolean setter)` Returns whether a property is a getter or a setter
`boolean` `isSealed()` Return true if this object is sealed.
`protected static boolean` `isTrue(java.lang.Object value)`
`void` `preventExtensions()`
`void` `put(int index, Scriptable start, java.lang.Object value)` Sets the value of the indexed property, creating it if need be.
`void` `put(java.lang.String name, Scriptable start, java.lang.Object value)` Sets the value of the named property, creating it if need be.
`void` `putConst(java.lang.String name, Scriptable start, java.lang.Object value)` Sets the value of the named const property, creating it if need be.
`static void` `putConstProperty(Scriptable obj, java.lang.String name, java.lang.Object value)` Puts a named property in an object or in an object in its prototype chain.
`static void` `putProperty(Scriptable obj, int index, java.lang.Object value)` Puts an indexed property in an object or in an object in its prototype chain.
`static void` `putProperty(Scriptable obj, java.lang.String name, java.lang.Object value)` Puts a named property in an object or in an object in its prototype chain.
`static void` `redefineProperty(Scriptable obj, java.lang.String name, boolean isConst)` If hasProperty(obj, name) would return true, then if the property that was found is compatible with the new property, this method just returns.
`void` `sealObject()` Seal this object.
`void` `setAttributes(int index, int attributes)` Set the attributes of an indexed property.
`void` `setAttributes(int index, Scriptable start, int attributes)` Deprecated. Use `setAttributes(int index, int attributes)`. The engine always ignored the start argument.
`void` `setAttributes(java.lang.String name, int attributes)` Set the attributes of a named property.
`void` `setAttributes(java.lang.String name, Scriptable start, int attributes)` Deprecated. Use `setAttributes(String name, int attributes)`. The engine always ignored the start argument.
`void` `setGetterOrSetter(java.lang.String name, int index, Callable getterOrSetter, boolean isSetter)` XXX: write docs.
`void` `setParentScope(Scriptable m)` Sets the parent (enclosing) scope of the object.
`void` `setPrototype(Scriptable m)` Sets the prototype of the object.
`int` `size()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### EMPTY

    public static final int EMPTY

  The empty property attribute. Used by getAttributes() and setAttributes().

  See Also:
    `getAttributes(String)`, `setAttributes(String, int)`, Constant Field Values

### READONLY

    public static final int READONLY

  Property attribute indicating assignment to this property is ignored.

  See Also:
    `#put(String, Scriptable, Object)`, `getAttributes(String)`, `setAttributes(String, int)`, Constant Field Values

### DONTENUM

    public static final int DONTENUM

  Property attribute indicating property is not enumerated. Only enumerated properties will be returned by getIds().

  See Also:
    `getIds()`, `getAttributes(String)`, `setAttributes(String, int)`, Constant Field Values

### PERMANENT

    public static final int PERMANENT

  Property attribute indicating property cannot be deleted.

  See Also:
    `delete(String)`, `getAttributes(String)`, `setAttributes(String, int)`, Constant Field Values

### UNINITIALIZED_CONST

    public static final int UNINITIALIZED_CONST

  Property attribute indicating that this is a const property that has not been assigned yet. The first 'const' assignment to the property will clear this bit.

  See Also:
    Constant Field Values

### CONST

    public static final int CONST

See Also:
  Constant Field Values

Constructor Detail

### ScriptableObject

    public ScriptableObject()

### ScriptableObject

    public ScriptableObject(Scriptable scope,
                            Scriptable prototype)

Method Detail

### buildDataDescriptor

    protected static ScriptableObject buildDataDescriptor(Scriptable scope,
                                                          java.lang.Object value,
                                                          int attributes)

### getTypeOf

    public java.lang.String getTypeOf()

  Gets the value that will be returned by calling the typeof operator on this object.

  Returns:
    default is "object" unless `avoidObjectDetection()` is `true` in which case it returns "undefined"

### getClassName

    public abstract java.lang.String getClassName()

  Return the name of the class. This is typically the same name as the constructor. Classes extending ScriptableObject must implement this abstract method.

  Specified by:
    `getClassName` in interface `Scriptable`

### has

    public boolean has(java.lang.String name,
                       Scriptable start)

  Returns true if the named property is defined.

  Specified by:
    `has` in interface `Scriptable`
  Parameters:
    `name` - the name of the property
    `start` - the object in which the lookup began
  Returns:
    true if and only if the property was found in the object
  See Also:
    `Scriptable.get(String, Scriptable)`, `getProperty(Scriptable, String)`

### has

    public boolean has(int index,
                       Scriptable start)

  Returns true if the property index is defined.

  Specified by:
    `has` in interface `Scriptable`
  Parameters:
    `index` - the numeric index for the property
    `start` - the object in which the lookup began
  Returns:
    true if and only if the property was found in the object
  See Also:
    `Scriptable.get(int, Scriptable)`, `getProperty(Scriptable, int)`

### get

    public java.lang.Object get(java.lang.String name,
                                Scriptable start)

  Returns the value of the named property or NOT_FOUND. If the property was created using defineProperty, the appropriate getter method is called.

  Specified by:
    `get` in interface `Scriptable`
  Parameters:
    `name` - the name of the property
    `start` - the object in which the lookup began
  Returns:
    the value of the property (may be null), or NOT_FOUND
  See Also:
    `Context.getUndefinedValue()`

### get

    public java.lang.Object get(int index,
                                Scriptable start)

  Returns the value of the indexed property or NOT_FOUND.

  Specified by:
    `get` in interface `Scriptable`
  Parameters:
    `index` - the numeric index for the property
    `start` - the object in which the lookup began
  Returns:
    the value of the property (may be null), or NOT_FOUND
  See Also:
    `Scriptable.get(String,Scriptable)`

### put

    public void put(java.lang.String name,
                    Scriptable start,
                    java.lang.Object value)

  Sets the value of the named property, creating it if need be. If the property was created using defineProperty, the appropriate setter method is called.

  If the property's attributes include READONLY, no action is taken. This method will actually set the property in the start object.

  Specified by:
    `put` in interface `Scriptable`
  Parameters:
    `name` - the name of the property
    `start` - the object whose property is being set
    `value` - value to set the property to
  See Also:
    `Scriptable.has(String, Scriptable)`, `Scriptable.get(String, Scriptable)`, `putProperty(Scriptable, String, Object)`, `Context.toObject(Object, Scriptable)`

### put

    public void put(int index,
                    Scriptable start,
                    java.lang.Object value)

  Sets the value of the indexed property, creating it if need be.

  Specified by:
    `put` in interface `Scriptable`
  Parameters:
    `index` - the numeric index for the property
    `start` - the object whose property is being set
    `value` - value to set the property to
  See Also:
    `Scriptable.has(int, Scriptable)`, `Scriptable.get(int, Scriptable)`, `putProperty(Scriptable, int, Object)`, `Context.toObject(Object, Scriptable)`

### delete

    public void delete(java.lang.String name)

  Removes a named property from the object. If the property is not found, or it has the PERMANENT attribute, no action is taken.

  Specified by:
    `delete` in interface `Scriptable`
  Parameters:
    `name` - the name of the property
  See Also:
    `Scriptable.get(String, Scriptable)`, `deleteProperty(Scriptable, String)`

### delete

    public void delete(int index)

  Removes the indexed property from the object. If the property is not found, or it has the PERMANENT attribute, no action is taken.

  Specified by:
    `delete` in interface `Scriptable`
  Parameters:
    `index` - the numeric index for the property
  See Also:
    `Scriptable.get(int, Scriptable)`, `deleteProperty(Scriptable, int)`

### putConst

    public void putConst(java.lang.String name,
                         Scriptable start,
                         java.lang.Object value)

  Sets the value of the named const property, creating it if need be. If the property was created using defineProperty, the appropriate setter method is called.

  If the property's attributes include READONLY, no action is taken. This method will actually set the property in the start object.

  Specified by:
    `putConst` in interface `ConstProperties`
  Parameters:
    `name` - the name of the property
    `start` - the object whose property is being set
    `value` - value to set the property to
  See Also:
    `Scriptable.has(String, Scriptable)`, `Scriptable.get(String, Scriptable)`, `putProperty(Scriptable, String, Object)`, `Context.toObject(Object, Scriptable)`

### defineConst

    public void defineConst(java.lang.String name,
                            Scriptable start)

  Description copied from interface: `ConstProperties`
  Reserves a definition spot for a const. This will set up a definition of the const property, but set its value to undefined. The semantics of the start parameter is the same as for putConst.

  Specified by:
    `defineConst` in interface `ConstProperties`
  Parameters:
    `name` - The name of the property.
    `start` - The object whose property is being reserved.

### isConst

    public boolean isConst(java.lang.String name)

  Returns true if the named property is defined as a const on this object.

  Specified by:
    `isConst` in interface `ConstProperties`
  Parameters:
    `name` -
  Returns:
    true if the named property is defined as a const, false otherwise.

### getAttributes

    public final int getAttributes(java.lang.String name,
                                   Scriptable start)

  Deprecated. Use `getAttributes(String name)`. The engine always ignored the start argument.

### getAttributes

    public final int getAttributes(int index,
                                   Scriptable start)

  Deprecated. Use `getAttributes(int index)`. The engine always ignored the start argument.

### setAttributes

    public final void setAttributes(java.lang.String name,
                                    Scriptable start,
                                    int attributes)

  Deprecated. Use `setAttributes(String name, int attributes)`. The engine always ignored the start argument.

### setAttributes

    public void setAttributes(int index,
                              Scriptable start,
                              int attributes)

  Deprecated. Use `setAttributes(int index, int attributes)`. The engine always ignored the start argument.

### getAttributes

    public int getAttributes(java.lang.String name)

  Get the attributes of a named property. The property is specified by `name` as defined for `has`.

  Parameters:
    `name` - the identifier for the property
  Returns:
    the bitset of attributes
  Throws:
    `EvaluatorException` - if the named property is not found
  See Also:
    `has(String, Scriptable)`, `READONLY`, `DONTENUM`, `PERMANENT`, `EMPTY`

### getAttributes

    public int getAttributes(int index)

  Get the attributes of an indexed property.

  Parameters:
    `index` - the numeric index for the property
  Returns:
    the bitset of attributes
  Throws:
    `EvaluatorException` - if the named property is not found is not found
  See Also:
    `has(String, Scriptable)`, `READONLY`, `DONTENUM`, `PERMANENT`, `EMPTY`

### setAttributes

    public void setAttributes(java.lang.String name,
                              int attributes)

  Set the attributes of a named property. The property is specified by `name` as defined for `has`.

  The possible attributes are READONLY, DONTENUM, and PERMANENT. Combinations of attributes are expressed by the bitwise OR of attributes. EMPTY is the state of no attributes set. Any unused bits are reserved for future use.

  Parameters:
    `name` - the name of the property
    `attributes` - the bitset of attributes
  Throws:
    `EvaluatorException` - if the named property is not found
  See Also:
    `Scriptable.has(String, Scriptable)`, `READONLY`, `DONTENUM`, `PERMANENT`, `EMPTY`

### setAttributes

    public void setAttributes(int index,
                              int attributes)

  Set the attributes of an indexed property.

  Parameters:
    `index` - the numeric index for the property
    `attributes` - the bitset of attributes
  Throws:
    `EvaluatorException` - if the named property is not found
  See Also:
    `Scriptable.has(String, Scriptable)`, `READONLY`, `DONTENUM`, `PERMANENT`, `EMPTY`

### setGetterOrSetter

    public void setGetterOrSetter(java.lang.String name,
                                  int index,
                                  Callable getterOrSetter,
                                  boolean isSetter)

  XXX: write docs.

### getGetterOrSetter

    public java.lang.Object getGetterOrSetter(java.lang.String name,
                                              int index,
                                              boolean isSetter)

  Get the getter or setter for a given property. Used by __lookupGetter__ and __lookupSetter__.

  Parameters:
    `name` - Name of the object. If nonnull, index must be 0.
    `index` - Index of the object. If nonzero, name must be null.
    `isSetter` - If true, return the setter, otherwise return the getter.
  Returns:
    Null if the property does not exist. Otherwise returns either the getter or the setter for the property, depending on the value of isSetter (may be undefined if unset).
  Throws:
    `java.lang.IllegalArgumentException` - if both name and index are nonnull and nonzero respectively.

### isGetterOrSetter

    protected boolean isGetterOrSetter(java.lang.String name,
                                       int index,
                                       boolean setter)

  Returns whether a property is a getter or a setter

  Parameters:
    `name` - property name
    `index` - property index
    `setter` - true to check for a setter, false for a getter
  Returns:
    whether the property is a getter or a setter

### getPrototype

    public Scriptable getPrototype()

  Returns the prototype of the object.

  Specified by:
    `getPrototype` in interface `Scriptable`
  Returns:
    the prototype

### setPrototype

    public void setPrototype(Scriptable m)

  Sets the prototype of the object.

  Specified by:
    `setPrototype` in interface `Scriptable`
  Parameters:
    `m` - the prototype to set

### getParentScope

    public Scriptable getParentScope()

  Returns the parent (enclosing) scope of the object.

  Specified by:
    `getParentScope` in interface `Scriptable`
  Returns:
    the parent scope

### setParentScope

    public void setParentScope(Scriptable m)

  Sets the parent (enclosing) scope of the object.

  Specified by:
    `setParentScope` in interface `Scriptable`
  Parameters:
    `m` - the parent scope to set

### getIds

    public java.lang.Object[] getIds()

  Returns an array of ids for the properties of the object.

  Any properties with the attribute DONTENUM are not listed.

  Specified by:
    `getIds` in interface `Scriptable`
  Returns:
    an array of java.lang.Objects with an entry for every listed property. Properties accessed via an integer index will have a corresponding Integer entry in the returned array. Properties accessed by a String will have a String entry in the returned array.

### getAllIds

    public java.lang.Object[] getAllIds()

  Returns an array of ids for the properties of the object.

  All properties, even those with attribute DONTENUM, are listed.

  Specified by:
    `getAllIds` in interface `DebuggableObject`
  Returns:
    an array of java.lang.Objects with an entry for every listed property. Properties accessed via an integer index will have a corresponding Integer entry in the returned array. Properties accessed by a String will have a String entry in the returned array.

### getDefaultValue

    public java.lang.Object getDefaultValue(java.lang.Class<?> typeHint)

  Implements the [[DefaultValue]] internal method.

  Note that the toPrimitive conversion is a no-op for every type other than Object, for which [[DefaultValue]] is called. See ECMA 9.1.

  A `hint` of null means "no hint".

  Specified by:
    `getDefaultValue` in interface `Scriptable`
  Parameters:
    `typeHint` - the type hint
  Returns:
    the default value for the object See ECMA 8.6.2.6.

### getDefaultValue

    public static java.lang.Object getDefaultValue(Scriptable object,
                                                   java.lang.Class<?> typeHint)

### hasInstance

    public boolean hasInstance(Scriptable instance)

  Implements the instanceof operator.

  This operator has been proposed to ECMA.

  Specified by:
    `hasInstance` in interface `Scriptable`
  Parameters:
    `instance` - The value that appeared on the LHS of the instanceof operator
  Returns:
    true if "this" appears in value's prototype chain

### avoidObjectDetection

    public boolean avoidObjectDetection()

  Emulate the SpiderMonkey (and Firefox) feature of allowing custom objects to avoid detection by normal "object detection" code patterns. This is used to implement document.all. See https://bugzilla.mozilla.org/show_bug.cgi?id=412247. This is an analog to JOF_DETECTING from SpiderMonkey; see https://bugzilla.mozilla.org/show_bug.cgi?id=248549. Other than this special case, embeddings should return false.

  Returns:
    true if this object should avoid object detection
  Since:
    1.7R1

### equivalentValues

    protected java.lang.Object equivalentValues(java.lang.Object value)

  Custom `==` operator. Must return `Scriptable.NOT_FOUND` if this object does not have custom equality operator for the given value, `Boolean.TRUE` if this object is equivalent to `value`, `Boolean.FALSE` if this object is not equivalent to `value`.

  The default implementation returns Boolean.TRUE if `this == value` or `Scriptable.NOT_FOUND` otherwise. It indicates that by default custom equality is available only if `value` is `this` in which case true is returned.

### defineClass

    public static <T extends Scriptable> void defineClass(Scriptable scope,
                                                          java.lang.Class<T> clazz)
                            throws java.lang.IllegalAccessException,
                                   java.lang.InstantiationException,
                                   java.lang.reflect.InvocationTargetException

  Defines JavaScript objects from a Java class that implements Scriptable. If the given class has a method

       static void init(Context cx, Scriptable scope, boolean sealed);

  or its compatibility form

       static void init(Scriptable scope);

  then it is invoked and no further initialization is done.

  However, if no such a method is found, then the class's constructors and methods are used to initialize a class in the following manner.

  First, the zero-parameter constructor of the class is called to create the prototype. If no such constructor exists, a `EvaluatorException` is thrown.

  Next, all methods are scanned for special prefixes that indicate that they have special meaning for defining JavaScript objects. These special prefixes are

  - `jsFunction_` for a JavaScript function
  - `jsStaticFunction_` for a JavaScript function that is a property of the constructor
  - `jsGet_` for a getter of a JavaScript property
  - `jsSet_` for a setter of a JavaScript property
  - `jsConstructor` for a JavaScript function that is the constructor

  If the method's name begins with "jsFunction_", a JavaScript function is created with a name formed from the rest of the Java method name following "jsFunction_". So a Java method named "jsFunction_foo" will define a JavaScript method "foo". Calling this JavaScript function will cause the Java method to be called. The parameters of the method must be of number and types as defined by the FunctionObject class. The JavaScript function is then added as a property of the prototype.

  If the method's name begins with "jsStaticFunction_", it is handled similarly except that the resulting JavaScript function is added as a property of the constructor object. The Java method must be static. If the method's name begins with "jsGet_" or "jsSet_", the method is considered to define a property. Accesses to the defined property will result in calls to these getter and setter methods. If no setter is defined, the property is defined as READONLY.

  If the method's name is "jsConstructor", the method is considered to define the body of the constructor. Only one method of this name may be defined. You may use the varargs forms for constructors documented in `FunctionObject.FunctionObject(String, Member, Scriptable)` If no method is found that can serve as constructor, a Java constructor will be selected to serve as the JavaScript constructor in the following manner. If the class has only one Java constructor, that constructor is used to define the JavaScript constructor. If the the class has two constructors, one must be the zero-argument constructor (otherwise an `EvaluatorException` would have already been thrown when the prototype was to be created). In this case the Java constructor with one or more parameters will be used to define the JavaScript constructor. If the class has three or more constructors, an `EvaluatorException` will be thrown.

  Finally, if there is a method

       static void finishInit(Scriptable scope, FunctionObject constructor,
                              Scriptable prototype)

  it will be called to finish any initialization. The `scope` argument will be passed, along with the newly created constructor and the newly created prototype.

  Parameters:
    `scope` - The scope in which to define the constructor.
    `clazz` - The Java class to use to define the JavaScript objects and properties.
  Throws:
    `java.lang.IllegalAccessException` - if access is not available to a reflected class member
    `java.lang.InstantiationException` - if unable to instantiate the named class
    `java.lang.reflect.InvocationTargetException` - if an exception is thrown during execution of methods of the named class
  See Also:
    `Function`, `FunctionObject`, `READONLY`, `#defineProperty(String, Class, int)`

### defineClass

    public static <T extends Scriptable> void defineClass(Scriptable scope,
                                                          java.lang.Class<T> clazz,
                                                          boolean sealed)
                            throws java.lang.IllegalAccessException,
                                   java.lang.InstantiationException,
                                   java.lang.reflect.InvocationTargetException

  Defines JavaScript objects from a Java class, optionally allowing sealing. Similar to `defineClass(Scriptable scope, Class clazz)` except that sealing is allowed. An object that is sealed cannot have properties added or removed. Note that sealing is not allowed in the current ECMA/ISO language specification, but is likely for the next version.

  Parameters:
    `scope` - The scope in which to define the constructor.
    `clazz` - The Java class to use to define the JavaScript objects and properties. The class must implement Scriptable.
    `sealed` - Whether or not to create sealed standard objects that cannot be modified.
  Throws:
    `java.lang.IllegalAccessException` - if access is not available to a reflected class member
    `java.lang.InstantiationException` - if unable to instantiate the named class
    `java.lang.reflect.InvocationTargetException` - if an exception is thrown during execution of methods of the named class
  Since:
    1.4R3

### defineClass

    public static <T extends Scriptable> java.lang.String defineClass(Scriptable scope,
                                                                      java.lang.Class<T> clazz,
                                                                      boolean sealed,
                                                                      boolean mapInheritance)
                                        throws java.lang.IllegalAccessException,
                                               java.lang.InstantiationException,
                                               java.lang.reflect.InvocationTargetException

  Defines JavaScript objects from a Java class, optionally allowing sealing and mapping of Java inheritance to JavaScript prototype-based inheritance. Similar to `defineClass(Scriptable scope, Class clazz)` except that sealing and inheritance mapping are allowed. An object that is sealed cannot have properties added or removed. Note that sealing is not allowed in the current ECMA/ISO language specification, but is likely for the next version.

  Parameters:
    `scope` - The scope in which to define the constructor.
    `clazz` - The Java class to use to define the JavaScript objects and properties. The class must implement Scriptable.
    `sealed` - Whether or not to create sealed standard objects that cannot be modified.
    `mapInheritance` - Whether or not to map Java inheritance to JavaScript prototype-based inheritance.
  Returns:
    the class name for the prototype of the specified class
  Throws:
    `java.lang.IllegalAccessException` - if access is not available to a reflected class member
    `java.lang.InstantiationException` - if unable to instantiate the named class
    `java.lang.reflect.InvocationTargetException` - if an exception is thrown during execution of methods of the named class
  Since:
    1.6R2

### defineProperty

    public void defineProperty(java.lang.String propertyName,
                               java.lang.Object value,
                               int attributes)

  Define a JavaScript property. Creates the property with an initial value and sets its attributes.

  Parameters:
    `propertyName` - the name of the property to define.
    `value` - the initial value of the property
    `attributes` - the attributes of the JavaScript property
  See Also:
    `Scriptable.put(String, Scriptable, Object)`

### defineProperty

    public static void defineProperty(Scriptable destination,
                                      java.lang.String propertyName,
                                      java.lang.Object value,
                                      int attributes)

  Utility method to add properties to arbitrary Scriptable object. If destination is instance of ScriptableObject, calls defineProperty there, otherwise calls put in destination ignoring attributes

### defineConstProperty

    public static void defineConstProperty(Scriptable destination,
                                           java.lang.String propertyName)

  Utility method to add properties to arbitrary Scriptable object. If destination is instance of ScriptableObject, calls defineProperty there, otherwise calls put in destination ignoring attributes

### defineProperty

    public void defineProperty(java.lang.String propertyName,
                               java.lang.Class<?> clazz,
                               int attributes)

  Define a JavaScript property with getter and setter side effects. If the setter is not found, the attribute READONLY is added to the given attributes.

  The getter must be a method with zero parameters, and the setter, if found, must be a method with one parameter.

  Parameters:
    `propertyName` - the name of the property to define. This name also affects the name of the setter and getter to search for. If the propertyId is "foo", then `clazz` will be searched for "getFoo" and "setFoo" methods.
    `clazz` - the Java class to search for the getter and setter
    `attributes` - the attributes of the JavaScript property
  See Also:
    `Scriptable.put(String, Scriptable, Object)`

### defineProperty

    public void defineProperty(java.lang.String propertyName,
                               java.lang.Object delegateTo,
                               java.lang.reflect.Method getter,
                               java.lang.reflect.Method setter,
                               int attributes)

  Define a JavaScript property. Use this method only if you wish to define getters and setters for a given property in a ScriptableObject. To create a property without special getter or setter side effects, use `defineProperty(String,int)`. If `setter` is null, the attribute READONLY is added to the given attributes.

  Several forms of getters or setters are allowed. In all cases the type of the value parameter can be any one of the following types: Object, String, boolean, Scriptable, byte, short, int, long, float, or double. The runtime will perform appropriate conversions based upon the type of the parameter (see description in FunctionObject). The first forms are nonstatic methods of the class referred to by 'this':

       Object getFoo();
       void setFoo(SomeType value);

  Next are static methods that may be of any class; the object whose property is being accessed is passed in as an extra argument:

       static Object getFoo(Scriptable obj);
       static void setFoo(Scriptable obj, SomeType value);

  Finally, it is possible to delegate to another object entirely using the `delegateTo` parameter. In this case the methods are nonstatic methods of the class delegated to, and the object whose property is being accessed is passed in as an extra argument:

       Object getFoo(Scriptable obj);
       void setFoo(Scriptable obj, SomeType value);

  Parameters:
    `propertyName` - the name of the property to define.
    `delegateTo` - an object to call the getter and setter methods on, or null, depending on the form used above.
    `getter` - the method to invoke to get the value of the property
    `setter` - the method to invoke to set the value of the property
    `attributes` - the attributes of the JavaScript property

### defineOwnProperties

    public void defineOwnProperties(Context cx,
                                    ScriptableObject props)

### defineOwnProperty

    public void defineOwnProperty(Context cx,
                                  java.lang.Object id,
                                  ScriptableObject desc)

  Defines a property on an object Based on [[DefineOwnProperty]] from 8.12.10 of the spec

  Parameters:
    `cx` - the current Context
    `id` - the name/index of the property
    `desc` - the new property descriptor, as described in 8.6.1

### isTrue

    protected static boolean isTrue(java.lang.Object value)

### isFalse

    protected static boolean isFalse(java.lang.Object value)

### applyDescriptorToAttributeBitset

    protected int applyDescriptorToAttributeBitset(int attributes,
                                                   ScriptableObject desc)

### isDataDescriptor

    protected boolean isDataDescriptor(ScriptableObject desc)

### isAccessorDescriptor

    protected boolean isAccessorDescriptor(ScriptableObject desc)

### isGenericDescriptor

    protected boolean isGenericDescriptor(ScriptableObject desc)

### ensureScriptable

    protected Scriptable ensureScriptable(java.lang.Object arg)

### ensureScriptableObject

    protected ScriptableObject ensureScriptableObject(java.lang.Object arg)

### defineFunctionProperties

    public void defineFunctionProperties(java.lang.String[] names,
                                         java.lang.Class<?> clazz,
                                         int attributes)

  Search for names in a class, adding the resulting methods as properties.

  Uses reflection to find the methods of the given names. Then FunctionObjects are constructed from the methods found, and are added to this object as properties with the given names.

  Parameters:
    `names` - the names of the Methods to add as function properties
    `clazz` - the class to search for the Methods
    `attributes` - the attributes of the new properties
  See Also:
    `FunctionObject`

### getObjectPrototype

    public static Scriptable getObjectPrototype(Scriptable scope)

  Get the Object.prototype property. See ECMA 15.2.4.

### getFunctionPrototype

    public static Scriptable getFunctionPrototype(Scriptable scope)

  Get the Function.prototype property. See ECMA 15.3.4.

### getArrayPrototype

    public static Scriptable getArrayPrototype(Scriptable scope)

### getClassPrototype

    public static Scriptable getClassPrototype(Scriptable scope,
                                               java.lang.String className)

  Get the prototype for the named class. For example, `getClassPrototype(s, "Date")` will first walk up the parent chain to find the outermost scope, then will search that scope for the Date constructor, and then will return Date.prototype. If any of the lookups fail, or the prototype is not a JavaScript object, then null will be returned.

  Parameters:
    `scope` - an object in the scope chain
    `className` - the name of the constructor
  Returns:
    the prototype for the named class, or null if it cannot be found.

### getTopLevelScope

    public static Scriptable getTopLevelScope(Scriptable obj)

  Get the global scope.

  Walks the parent scope chain to find an object with a null parent scope (the global object).

  Parameters:
    `obj` - a JavaScript object
  Returns:
    the corresponding global scope

### isExtensible

    public boolean isExtensible()

### preventExtensions

    public void preventExtensions()

### sealObject

    public void sealObject()

  Seal this object. It is an error to add properties to or delete properties from a sealed object. It is possible to change the value of an existing property. Once an object is sealed it may not be unsealed.

  Since:
    1.4R3

### isSealed

    public final boolean isSealed()

  Return true if this object is sealed.

  Returns:
    true if sealed, false otherwise.
  Since:
    1.4R3
  See Also:
    `sealObject()`

### getProperty

    public static java.lang.Object getProperty(Scriptable obj,
                                               java.lang.String name)

  Gets a named property from an object or any object in its prototype chain.

  Searches the prototype chain for a property named `name`.

  Parameters:
    `obj` - a JavaScript object
    `name` - a property name
  Returns:
    the value of a property with name `name` found in `obj` or any object in its prototype chain, or `Scriptable.NOT_FOUND` if not found
  Since:
    1.5R2

### getTypedProperty

    public static <T> T getTypedProperty(Scriptable s,
                                         int index,
                                         java.lang.Class<T> type)

  Gets an indexed property from an object or any object in its prototype chain and coerces it to the requested Java type.

  Searches the prototype chain for a property with integral index `index`. Note that if you wish to look for properties with numerical but non-integral indicies, you should use getProperty(Scriptable,String) with the string value of the index.

  Parameters:
    `s` - a JavaScript object
    `index` - an integral index
    `type` - the required Java type of the result
  Returns:
    the value of a property with name `name` found in `obj` or any object in its prototype chain, or null if not found. Note that it does not return `Scriptable.NOT_FOUND` as it can ordinarily not be converted to most of the types.
  Since:
    1.7R3

### getProperty

    public static java.lang.Object getProperty(Scriptable obj,
                                               int index)

  Gets an indexed property from an object or any object in its prototype chain.

  Searches the prototype chain for a property with integral index `index`. Note that if you wish to look for properties with numerical but non-integral indicies, you should use getProperty(Scriptable,String) with the string value of the index.

  Parameters:
    `obj` - a JavaScript object
    `index` - an integral index
  Returns:
    the value of a property with index `index` found in `obj` or any object in its prototype chain, or `Scriptable.NOT_FOUND` if not found
  Since:
    1.5R2

### getTypedProperty

    public static <T> T getTypedProperty(Scriptable s,
                                         java.lang.String name,
                                         java.lang.Class<T> type)

  Gets a named property from an object or any object in its prototype chain and coerces it to the requested Java type.

  Searches the prototype chain for a property named `name`.

  Parameters:
    `s` - a JavaScript object
    `name` - a property name
    `type` - the required Java type of the result
  Returns:
    the value of a property with name `name` found in `obj` or any object in its prototype chain, or null if not found. Note that it does not return `Scriptable.NOT_FOUND` as it can ordinarily not be converted to most of the types.
  Since:
    1.7R3

### hasProperty

    public static boolean hasProperty(Scriptable obj,
                                      java.lang.String name)

  Returns whether a named property is defined in an object or any object in its prototype chain.

  Searches the prototype chain for a property named `name`.

  Parameters:
    `obj` - a JavaScript object
    `name` - a property name
  Returns:
    the true if property was found
  Since:
    1.5R2

### redefineProperty

    public static void redefineProperty(Scriptable obj,
                                        java.lang.String name,
                                        boolean isConst)

  If hasProperty(obj, name) would return true, then if the property that was found is compatible with the new property, this method just returns. If the property is not compatible, then an exception is thrown. A property redefinition is incompatible if the first definition was a const declaration or if this one is. They are compatible only if neither was const.

### hasProperty

    public static boolean hasProperty(Scriptable obj,
                                      int index)

  Returns whether an indexed property is defined in an object or any object in its prototype chain.

  Searches the prototype chain for a property with index `index`.

  Parameters:
    `obj` - a JavaScript object
    `index` - a property index
  Returns:
    the true if property was found
  Since:
    1.5R2

### putProperty

    public static void putProperty(Scriptable obj,
                                   java.lang.String name,
                                   java.lang.Object value)

  Puts a named property in an object or in an object in its prototype chain.

  Searches for the named property in the prototype chain. If it is found, the value of the property in `obj` is changed through a call to `Scriptable.put(String, Scriptable, Object)` on the prototype passing `obj` as the `start` argument. This allows the prototype to veto the property setting in case the prototype defines the property with [[ReadOnly]] attribute. If the property is not found, it is added in `obj`.

  Parameters:
    `obj` - a JavaScript object
    `name` - a property name
    `value` - any JavaScript value accepted by Scriptable.put
  Since:
    1.5R2

### putConstProperty

    public static void putConstProperty(Scriptable obj,
                                        java.lang.String name,
                                        java.lang.Object value)

  Puts a named property in an object or in an object in its prototype chain.

  Searches for the named property in the prototype chain. If it is found, the value of the property in `obj` is changed through a call to `Scriptable.put(String, Scriptable, Object)` on the prototype passing `obj` as the `start` argument. This allows the prototype to veto the property setting in case the prototype defines the property with [[ReadOnly]] attribute. If the property is not found, it is added in `obj`.

  Parameters:
    `obj` - a JavaScript object
    `name` - a property name
    `value` - any JavaScript value accepted by Scriptable.put
  Since:
    1.5R2

### putProperty

    public static void putProperty(Scriptable obj,
                                   int index,
                                   java.lang.Object value)

  Puts an indexed property in an object or in an object in its prototype chain.

  Searches for the indexed property in the prototype chain. If it is found, the value of the property in `obj` is changed through a call to `Scriptable.put(int, Scriptable, Object)` on the prototype passing `obj` as the `start` argument. This allows the prototype to veto the property setting in case the prototype defines the property with [[ReadOnly]] attribute. If the property is not found, it is added in `obj`.

  Parameters:
    `obj` - a JavaScript object
    `index` - a property index
    `value` - any JavaScript value accepted by Scriptable.put
  Since:
    1.5R2

### deleteProperty

    public static boolean deleteProperty(Scriptable obj,
                                         java.lang.String name)

  Removes the property from an object or its prototype chain.

  Searches for a property with `name` in obj or its prototype chain. If it is found, the object's delete method is called.

  Parameters:
    `obj` - a JavaScript object
    `name` - a property name
  Returns:
    true if the property doesn't exist or was successfully removed
  Since:
    1.5R2

### deleteProperty

    public static boolean deleteProperty(Scriptable obj,
                                         int index)

  Removes the property from an object or its prototype chain.

  Searches for a property with `index` in obj or its prototype chain. If it is found, the object's delete method is called.

  Parameters:
    `obj` - a JavaScript object
    `index` - a property index
  Returns:
    true if the property doesn't exist or was successfully removed
  Since:
    1.5R2

### getPropertyIds

    public static java.lang.Object[] getPropertyIds(Scriptable obj)

  Returns an array of all ids from an object and its prototypes.

  Parameters:
    `obj` - a JavaScript object
  Returns:
    an array of all ids from all object in the prototype chain. If a given id occurs multiple times in the prototype chain, it will occur only once in this list.
  Since:
    1.5R2

### callMethod

    public static java.lang.Object callMethod(Scriptable obj,
                                              java.lang.String methodName,
                                              java.lang.Object[] args)

  Call a method of an object.

  Parameters:
    `obj` - the JavaScript object
    `methodName` - the name of the function property
    `args` - the arguments for the call
  See Also:
    `Context.getCurrentContext()`

### callMethod

    public static java.lang.Object callMethod(Context cx,
                                              Scriptable obj,
                                              java.lang.String methodName,
                                              java.lang.Object[] args)

  Call a method of an object.

  Parameters:
    `cx` - the Context object associated with the current thread.
    `obj` - the JavaScript object
    `methodName` - the name of the function property
    `args` - the arguments for the call

### getAssociatedValue

    public final java.lang.Object getAssociatedValue(java.lang.Object key)

  Get arbitrary application-specific value associated with this object.

  Parameters:
    `key` - key object to select particular value.
  See Also:
    `associateValue(Object key, Object value)`

### getTopScopeValue

    public static java.lang.Object getTopScopeValue(Scriptable scope,
                                                    java.lang.Object key)

  Get arbitrary application-specific value associated with the top scope of the given scope. The method first calls `getTopLevelScope(Scriptable scope)` and then searches the prototype chain of the top scope for the first object containing the associated value with the given key.

  Parameters:
    `scope` - the starting scope.
    `key` - key object to select particular value.
  See Also:
    `getAssociatedValue(Object key)`

### associateValue

    public final java.lang.Object associateValue(java.lang.Object key,
                                                 java.lang.Object value)

  Associate arbitrary application-specific value with this object. Value can only be associated with the given object and key only once. The method ignores any subsequent attempts to change the already associated value.

  The associated values are not serialized.

  Parameters:
    `key` - key object to select particular value.
    `value` - the value to associate
  Returns:
    the passed value if the method is called first time for the given key or old value for any subsequent calls.
  See Also:
    `getAssociatedValue(Object key)`

### getOwnPropertyDescriptor

    protected ScriptableObject getOwnPropertyDescriptor(Context cx,
                                                        java.lang.Object id)

### getSlot

    protected org.mozilla.javascript.ScriptableObject.Slot getSlot(Context cx,
                                                                   java.lang.Object id,
                                                                   int accessType)

### size

    public int size()

### isEmpty

    public boolean isEmpty()

### get

    public java.lang.Object get(java.lang.Object key)