Package org.mozilla.javascript

Class NativeWeakMap

java.lang.Object

org.mozilla.javascript.ScriptableObject

org.mozilla.javascript.IdScriptableObject

org.mozilla.javascript.NativeWeakMap

All Implemented Interfaces:

Serializable, ConstProperties, DebuggableObject, IdFunctionCall, Scriptable, SymbolScriptable

public class NativeWeakMap
extends IdScriptableObject

This is an implementation of the ES6 WeakMap class. As per the spec, keys must be ordinary objects. Since there is no defined "equality" for objects, comparisions are done strictly by object equality. Both ES6 and the java.util.WeakHashMap class have the same basic structure -- entries are removed automatically when the sole remaining reference to the key is a weak reference. Therefore, we can use WeakHashMap as the basis of this implementation and preserve the same semantics.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.mozilla.javascript.ScriptableObject

ScriptableObject.KeyComparator

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	Id_constructor
private static final int	Id_delete
private static final int	Id_get
private static final int	Id_has
private static final int	Id_set
private boolean	instanceOfWeakMap
private WeakHashMap<Scriptable,Object>	map
private static final Object	MAP_TAG
private static final int	MAX_PROTOTYPE_ID
private static final Object	NULL_VALUE
private static final long	serialVersionUID
private static final int	SymbolId_toStringTag

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	Description
NativeWeakMap()

Method Summary

Modifier and Type	Method	Description
Object	execIdCall(IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args)	'thisObj' will be null if invoked as constructor, in which case * instance of Scriptable should be returned.
protected int	findPrototypeId(String s)
protected int	findPrototypeId(Symbol k)
String	getClassName()	Return the name of the class.
(package private) static void	init(Scriptable scope, boolean sealed)
protected void	initPrototypeId(int id)
private Object	js_delete(Object key)
private Object	js_get(Object key)
private Object	js_has(Object key)
private Object	js_set(Object key, Object v)
private void	readObject(ObjectInputStream stream)
private static NativeWeakMap	realThis(Scriptable thisObj, IdFunctionObject f)

Methods inherited from class org.mozilla.javascript.IdScriptableObject

activatePrototypeMap, addIdFunctionProperty, defaultGet, defaultHas, defaultPut, defineOwnProperty, delete, delete, ensureType, exportAsJSClass, fillConstructorProperties, findInstanceIdInfo, findInstanceIdInfo, get, get, getAttributes, getAttributes, getIds, getInstanceIdName, getInstanceIdValue, getMaxInstanceId, getOwnPropertyDescriptor, has, has, hasPrototypeMap, initPrototypeConstructor, initPrototypeMethod, initPrototypeMethod, initPrototypeMethod, initPrototypeValue, initPrototypeValue, instanceIdInfo, put, put, setAttributes, setInstanceIdAttributes, setInstanceIdValue

Methods inherited from class org.mozilla.javascript.ScriptableObject

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

Methods inherited from class java.lang.Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

MAP_TAG

private static final Object MAP_TAG

instanceOfWeakMap

private boolean instanceOfWeakMap

map

private transient WeakHashMap<Scriptable,Object> map

NULL_VALUE

private static final Object NULL_VALUE

Id_constructor

private static final int Id_constructor

See Also:

• Constant Field Values

Id_delete

private static final int Id_delete

See Also:

• Constant Field Values

Id_get

private static final int Id_get

See Also:

• Constant Field Values

Id_has

private static final int Id_has

See Also:

• Constant Field Values

Id_set

private static final int Id_set

See Also:

• Constant Field Values

SymbolId_toStringTag

private static final int SymbolId_toStringTag

See Also:

• Constant Field Values

MAX_PROTOTYPE_ID

private static final int MAX_PROTOTYPE_ID

See Also:

• Constant Field Values

Constructor Details

NativeWeakMap

public NativeWeakMap()

Method Details

init

static void init(Scriptable scope,
 boolean sealed)

getClassName

public String getClassName()

Description copied from class: ScriptableObject

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

Specified by:

getClassName in class ScriptableObject

execIdCall

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

Description copied from class: IdScriptableObject

'thisObj' will be null if invoked as constructor, in which case * instance of Scriptable should be returned.

Specified by:

execIdCall in interface IdFunctionCall

Overrides:

execIdCall in class IdScriptableObject

js_delete

private Object js_delete(Object key)

js_get

private Object js_get(Object key)

js_has

private Object js_has(Object key)

js_set

private Object js_set(Object key,
 Object v)

realThis

private static NativeWeakMap realThis(Scriptable thisObj,
 IdFunctionObject f)

initPrototypeId

protected void initPrototypeId(int id)

Overrides:

initPrototypeId in class IdScriptableObject

findPrototypeId

protected int findPrototypeId(Symbol k)

Overrides:

findPrototypeId in class IdScriptableObject

findPrototypeId

protected int findPrototypeId(String s)

Overrides:

findPrototypeId in class IdScriptableObject

readObject

private void readObject(ObjectInputStream stream)
                 throws IOException,
ClassNotFoundException

Throws:

IOException

ClassNotFoundException