org.mozilla.javascript

## Class IdScriptableObject

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

- All Implemented Interfaces:
    java.io.Serializable, ConstProperties, DebuggableObject, IdFunctionCall, Scriptable
  Direct Known Subclasses:
    BaseFunction, NativeArray, NativeCall, NativeContinuation, NativeGenerator, NativeIterator, NativeJSON, NativeObject, NativeRegExp, TopLevel, XMLObject

      public abstract class IdScriptableObject
      extends ScriptableObject
      implements IdFunctionCall

  Base class for native object implementation that uses IdFunctionObject to export its methods to script via .prototype object. Any descendant should implement at least the following methods: findInstanceIdInfo getInstanceIdName execIdCall methodArity To define non-function properties, the descendant should override getInstanceIdValue setInstanceIdValue to get/set property value and provide its default attributes. To customize initialization of constructor and prototype objects, descendant may override scopeInit or fillConstructorProperties methods.
  See Also:
    Serialized Form

- - ### Field Summary

    - ### Fields inherited from class org.mozilla.javascript.ScriptableObject

      `CONST, DONTENUM, EMPTY, PERMANENT, READONLY, UNINITIALIZED_CONST`

    - ### Fields inherited from interface org.mozilla.javascript.Scriptable

      `NOT_FOUND`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `IdScriptableObject()`
    `IdScriptableObject(Scriptable scope, Scriptable prototype)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `activatePrototypeMap(int maxPrototypeId)`
    `protected void` | `addIdFunctionProperty(Scriptable obj, java.lang.Object tag, int id, java.lang.String name, int arity)`
    `protected java.lang.Object` | `defaultGet(java.lang.String name)`
    `protected void` | `defaultPut(java.lang.String name, java.lang.Object value)`
    `void` | `defineOwnProperty(Context cx, java.lang.Object key, ScriptableObject desc)` Defines a property on an object.
    `void` | `delete(java.lang.String name)` Removes a named property from the object.
    `java.lang.Object` | `execIdCall(IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, java.lang.Object[] args)` 'thisObj' will be null if invoked as constructor, in which case instance of Scriptable should be returned.
    `IdFunctionObject` | `exportAsJSClass(int maxPrototypeId, Scriptable scope, boolean sealed)`
    `protected void` | `fillConstructorProperties(IdFunctionObject ctor)`
    `protected int` | `findInstanceIdInfo(java.lang.String name)` Map name to id of instance property.
    `protected int` | `findPrototypeId(java.lang.String name)`
    `java.lang.Object` | `get(java.lang.String name, Scriptable start)` Returns the value of the named property or NOT_FOUND.
    `int` | `getAttributes(java.lang.String name)` Get the attributes of a named property.
    `protected java.lang.String` | `getInstanceIdName(int id)` Map id back to property name it defines.
    `protected java.lang.Object` | `getInstanceIdValue(int id)` Get id value.
    `protected int` | `getMaxInstanceId()` Get maximum id findInstanceIdInfo can generate.
    `protected ScriptableObject` | `getOwnPropertyDescriptor(Context cx, java.lang.Object id)`
    `boolean` | `has(java.lang.String name, Scriptable start)` Returns true if the named property is defined.
    `boolean` | `hasPrototypeMap()`
    `protected static EcmaError` | `incompatibleCallError(IdFunctionObject f)` Utility method to construct type error to indicate incompatible call when converting script thisObj to a particular type is not possible.
    `void` | `initPrototypeConstructor(IdFunctionObject f)`
    `protected void` | `initPrototypeId(int id)`
    `void` | `initPrototypeMethod(java.lang.Object tag, int id, java.lang.String name, int arity)`
    `void` | `initPrototypeValue(int id, java.lang.String name, java.lang.Object value, int attributes)`
    `protected static int` | `instanceIdInfo(int attributes, int id)`
    `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` | `setAttributes(java.lang.String name, int attributes)` Set the attributes of a named property.
    `protected void` | `setInstanceIdAttributes(int id, int attr)` Update the attributes of the given instance property.
    `protected void` | `setInstanceIdValue(int id, java.lang.Object value)` Set or delete id value.

    - ### Methods inherited from class org.mozilla.javascript.ScriptableObject

      `applyDescriptorToAttributeBitset, associateValue, avoidObjectDetection, buildDataDescriptor, callMethod, callMethod, checkPropertyChange, checkPropertyDefinition, defineClass, defineClass, defineClass, defineConst, defineConstProperty, defineFunctionProperties, defineOwnProperties, defineOwnProperty, defineProperty, defineProperty, defineProperty, defineProperty, delete, deleteProperty, deleteProperty, ensureScriptable, ensureScriptableObject, equivalentValues, get, get, getAllIds, getArrayPrototype, getAssociatedValue, getAttributes, getAttributes, getAttributes, getClassName, getClassPrototype, getDefaultValue, getDefaultValue, getFunctionPrototype, getGetterOrSetter, getIds, getObjectPrototype, getParentScope, getProperty, getProperty, getPropertyIds, getPrototype, getSlot, getTopLevelScope, getTopScopeValue, getTypedProperty, getTypedProperty, getTypeOf, has, hasInstance, hasProperty, hasProperty, isAccessorDescriptor, isConst, isDataDescriptor, isEmpty, isExtensible, isFalse, isGenericDescriptor, isGetterOrSetter, isSealed, isTrue, preventExtensions, put, putConst, putConstProperty, putProperty, putProperty, redefineProperty, sameValue, sealObject, setAttributes, setAttributes, setAttributes, setGetterOrSetter, setParentScope, setPrototype, size`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### IdScriptableObject

          public IdScriptableObject()

    - #### IdScriptableObject

          public IdScriptableObject(Scriptable scope,
                            Scriptable prototype)

  - ### Method Detail

    - #### defaultGet

          protected final java.lang.Object defaultGet(java.lang.String name)

    - #### defaultPut

          protected final void defaultPut(java.lang.String name,
                        java.lang.Object value)

    - #### has

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

      Description copied from class: `ScriptableObject`
      Returns true if the named property is defined.
      Specified by:
        `has` in interface `Scriptable`
      Overrides:
        `has` in class `ScriptableObject`
      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)`, `ScriptableObject.getProperty(Scriptable, String)`

    - #### get

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

      Description copied from class: `ScriptableObject`
      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`
      Overrides:
        `get` in class `ScriptableObject`
      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()`

    - #### put

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

      Description copied from class: `ScriptableObject`
      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`
      Overrides:
        `put` in class `ScriptableObject`
      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)`, `ScriptableObject.putProperty(Scriptable, String, Object)`, `Context.toObject(Object, Scriptable)`

    - #### delete

          public void delete(java.lang.String name)

      Description copied from class: `ScriptableObject`
      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`
      Overrides:
        `delete` in class `ScriptableObject`
      Parameters:
        `name` - the name of the property
      See Also:
        `Scriptable.get(String, Scriptable)`, `ScriptableObject.deleteProperty(Scriptable, String)`

    - #### getAttributes

          public int getAttributes(java.lang.String name)

      Description copied from class: `ScriptableObject`
      Get the attributes of a named property. The property is specified by `name` as defined for `has`.

      Overrides:
        `getAttributes` in class `ScriptableObject`
      Parameters:
        `name` - the identifier for the property
      Returns:
        the bitset of attributes
      See Also:
        `ScriptableObject.has(String, Scriptable)`, `ScriptableObject.READONLY`, `ScriptableObject.DONTENUM`, `ScriptableObject.PERMANENT`, `ScriptableObject.EMPTY`

    - #### setAttributes

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

      Description copied from class: `ScriptableObject`
      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.

      Overrides:
        `setAttributes` in class `ScriptableObject`
      Parameters:
        `name` - the name of the property
        `attributes` - the bitset of attributes
      See Also:
        `Scriptable.has(String, Scriptable)`, `ScriptableObject.READONLY`, `ScriptableObject.DONTENUM`, `ScriptableObject.PERMANENT`, `ScriptableObject.EMPTY`

    - #### getMaxInstanceId

          protected int getMaxInstanceId()

      Get maximum id findInstanceIdInfo can generate.

    - #### instanceIdInfo

          protected static int instanceIdInfo(int attributes,
                           int id)

    - #### findInstanceIdInfo

          protected int findInstanceIdInfo(java.lang.String name)

      Map name to id of instance property. Should return 0 if not found or the result of `instanceIdInfo(int, int)`.

    - #### getInstanceIdName

          protected java.lang.String getInstanceIdName(int id)

      Map id back to property name it defines.

    - #### getInstanceIdValue

          protected java.lang.Object getInstanceIdValue(int id)

      Get id value. If id value is constant, descendant can call cacheIdValue to store value in the permanent cache. Default implementation creates IdFunctionObject instance for given id and cache its value

    - #### setInstanceIdValue

          protected void setInstanceIdValue(int id,
                                java.lang.Object value)

      Set or delete id value. If value == NOT_FOUND , the implementation should make sure that the following getInstanceIdValue return NOT_FOUND.

    - #### setInstanceIdAttributes

          protected void setInstanceIdAttributes(int id,
                                     int attr)

      Update the attributes of the given instance property. Classes which want to support changing property attributes via Object.defineProperty must override this method. The default implementation throws InternalError.
      Parameters:
        `id` - the instance property id
        `attr` - the new attribute bitset

    - #### execIdCall

          public java.lang.Object execIdCall(IdFunctionObject f,
                                    Context cx,
                                    Scriptable scope,
                                    Scriptable thisObj,
                                    java.lang.Object[] args)

      'thisObj' will be null if invoked as constructor, in which case instance of Scriptable should be returned.
      Specified by:
        `execIdCall` in interface `IdFunctionCall`

    - #### exportAsJSClass

          public final IdFunctionObject exportAsJSClass(int maxPrototypeId,
                                         Scriptable scope,
                                         boolean sealed)

    - #### hasPrototypeMap

          public final boolean hasPrototypeMap()

    - #### activatePrototypeMap

          public final void activatePrototypeMap(int maxPrototypeId)

    - #### initPrototypeMethod

          public final void initPrototypeMethod(java.lang.Object tag,
                                 int id,
                                 java.lang.String name,
                                 int arity)

    - #### initPrototypeConstructor

          public final void initPrototypeConstructor(IdFunctionObject f)

    - #### initPrototypeValue

          public final void initPrototypeValue(int id,
                                java.lang.String name,
                                java.lang.Object value,
                                int attributes)

    - #### initPrototypeId

          protected void initPrototypeId(int id)

    - #### findPrototypeId

          protected int findPrototypeId(java.lang.String name)

    - #### fillConstructorProperties

          protected void fillConstructorProperties(IdFunctionObject ctor)

    - #### addIdFunctionProperty

          protected void addIdFunctionProperty(Scriptable obj,
                                   java.lang.Object tag,
                                   int id,
                                   java.lang.String name,
                                   int arity)

    - #### incompatibleCallError

          protected static EcmaError incompatibleCallError(IdFunctionObject f)

      Utility method to construct type error to indicate incompatible call when converting script thisObj to a particular type is not possible. Possible usage would be to have a private function like realThis:

            private static NativeSomething realThis(Scriptable thisObj,
                                                    IdFunctionObject f)
            {
                if (!(thisObj instanceof NativeSomething))
                    throw incompatibleCallError(f);
                return (NativeSomething)thisObj;
           }

      Note that although such function can be implemented universally via java.lang.Class.isInstance(), it would be much more slower.
      Parameters:
        `f` - function that is attempting to convert 'this' object.
      Returns:
        Scriptable object suitable for a check by the instanceof operator.
      Throws:
        `java.lang.RuntimeException` - if no more instanceof target can be found

    - #### defineOwnProperty

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

      Description copied from class: `ScriptableObject`
      Defines a property on an object.
      Overrides:
        `defineOwnProperty` in class `ScriptableObject`
      Parameters:
        `cx` - the current Context
        `key` - the name/index of the property
        `desc` - the new property descriptor, as described in 8.6.1

    - #### getOwnPropertyDescriptor

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

      Overrides:
        `getOwnPropertyDescriptor` in class `ScriptableObject`