Class NativeSymbol

java.lang.Object

org.mozilla.javascript.ScriptableObject

org.mozilla.javascript.IdScriptableObject

org.mozilla.javascript.NativeSymbol

All Implemented Interfaces:

Serializable, ConstProperties, DebuggableObject, IdFunctionCall, Scriptable, Symbol, SymbolScriptable

public class NativeSymbol
extends IdScriptableObject
implements Symbol

This is an implementation of the standard "Symbol" type that implements all of its weird properties. One of them is that some objects can have an "internal data slot" that makes them a Symbol and others cannot.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class ScriptableObject

ScriptableObject.KeyComparator

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CLASS_NAME
private static final Object	CONSTRUCTOR_SLOT
private static final int	ConstructorId_for
private static final int	ConstructorId_keyFor
private static final Object	GLOBAL_TABLE_KEY
private static final int	Id_constructor
private static final int	Id_toString
private static final int	Id_valueOf
private final SymbolKey	key
private static final int	MAX_PROTOTYPE_ID
private static final long	serialVersionUID
private final NativeSymbol	symbolData
private static final int	SymbolId_toPrimitive
private static final int	SymbolId_toStringTag
static final String	TYPE_NAME

Fields inherited from class ScriptableObject

CONST, DONTENUM, EMPTY, PERMANENT, READONLY, UNINITIALIZED_CONST

Fields inherited from interface Scriptable

NOT_FOUND

Constructor Summary

Constructors

Modifier	Constructor	Description
private	NativeSymbol(String desc)	This has to be used only for constructing the prototype instance.
	NativeSymbol(NativeSymbol s)
private	NativeSymbol(SymbolKey key)

Method Summary

Modifier and Type	Method	Description
static NativeSymbol	construct(Context cx, Scriptable scope, Object[] args)	Use this when we need to create symbols internally because of the convoluted way we have to construct them.
private static void	createStandardSymbol(Context cx, Scriptable scope, ScriptableObject ctor, String name, SymbolKey key)
boolean	equals(Object x)
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 void	fillConstructorProperties(IdFunctionObject ctor)
protected int	findPrototypeId(String s)
protected int	findPrototypeId(Symbol key)
String	getClassName()	Return the name of the class.
private Map<String, NativeSymbol>	getGlobalMap()
(package private) SymbolKey	getKey()
private static NativeSymbol	getSelf(Context cx, Scriptable scope, Object thisObj)
String	getTypeOf()	Gets the value that will be returned by calling the typeof operator on this object.
int	hashCode()
static void	init(Context cx, Scriptable scope, boolean sealed)
protected void	initPrototypeId(int id)
private static boolean	isStrictMode()
boolean	isSymbol()	Object() on a Symbol constructs an object which is NOT a symbol, but which has an "internal data slot" that is.
private static NativeSymbol	js_constructor(Object[] args)
private Object	js_for(Context cx, Scriptable scope, Object[] args)
private Object	js_keyFor(Context cx, Scriptable scope, Object[] args)
private Object	js_valueOf()
void	put(int index, Scriptable start, Object value)	Sets the value of the indexed property, creating it if need be.
void	put(String name, Scriptable start, Object value)	Sets the value of the named property, creating it if need be.
void	put(Symbol key, Scriptable start, Object value)	Implementation of put required by SymbolScriptable objects.
String	toString()

Methods inherited from class IdScriptableObject

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

Methods inherited from class 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, has, hasInstance, hasProperty, hasProperty, hasProperty, isAccessorDescriptor, isConst, isDataDescriptor, isEmpty, isExtensible, isFalse, isGenericDescriptor, isGetterOrSetter, isSealed, isTrue, preventExtensions, putConst, putConstProperty, putProperty, putProperty, putProperty, querySlot, redefineProperty, sameValue, sealObject, setAttributes, setAttributes, setAttributes, setAttributes, setCommonDescriptorProperties, setExternalArrayData, setGetterOrSetter, setParentScope, setPrototype, size

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

CLASS_NAME

public static final String CLASS_NAME

See Also:

• Constant Field Values

TYPE_NAME

public static final String TYPE_NAME

See Also:

• Constant Field Values

GLOBAL_TABLE_KEY

private static final Object GLOBAL_TABLE_KEY

CONSTRUCTOR_SLOT

private static final Object CONSTRUCTOR_SLOT

key

private final SymbolKey key

symbolData

private final NativeSymbol symbolData

ConstructorId_keyFor

private static final int ConstructorId_keyFor

See Also:

• Constant Field Values

ConstructorId_for

private static final int ConstructorId_for

See Also:

• Constant Field Values

Id_constructor

private static final int Id_constructor

See Also:

• Constant Field Values

Id_toString

private static final int Id_toString

See Also:

• Constant Field Values

Id_valueOf

private static final int Id_valueOf

See Also:

• Constant Field Values

SymbolId_toStringTag

private static final int SymbolId_toStringTag

See Also:

• Constant Field Values

SymbolId_toPrimitive

private static final int SymbolId_toPrimitive

See Also:

• Constant Field Values

MAX_PROTOTYPE_ID

private static final int MAX_PROTOTYPE_ID

See Also:

• Constant Field Values

Constructor Details

NativeSymbol

private NativeSymbol(String desc)

This has to be used only for constructing the prototype instance. This sets symbolData to null (see isSymbol() for more).

Parameters:

desc - the description

NativeSymbol

private NativeSymbol(SymbolKey key)

NativeSymbol

public NativeSymbol(NativeSymbol s)

Method Details

init

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

construct

public static NativeSymbol construct(Context cx,
 Scriptable scope,
 Object[] args)

Use this when we need to create symbols internally because of the convoluted way we have to construct them.

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

fillConstructorProperties

protected void fillConstructorProperties(IdFunctionObject ctor)

Overrides:

fillConstructorProperties in class IdScriptableObject

createStandardSymbol

private static void createStandardSymbol(Context cx,
 Scriptable scope,
 ScriptableObject ctor,
 String name,
 SymbolKey key)

findPrototypeId

protected int findPrototypeId(String s)

Overrides:

findPrototypeId in class IdScriptableObject

findPrototypeId

protected int findPrototypeId(Symbol key)

Overrides:

findPrototypeId in class IdScriptableObject

initPrototypeId

protected void initPrototypeId(int id)

Overrides:

initPrototypeId in class IdScriptableObject

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

getSelf

private static NativeSymbol getSelf(Context cx,
 Scriptable scope,
 Object thisObj)

js_constructor

private static NativeSymbol js_constructor(Object[] args)

js_valueOf

private Object js_valueOf()

js_for

private Object js_for(Context cx,
 Scriptable scope,
 Object[] args)

js_keyFor

private Object js_keyFor(Context cx,
 Scriptable scope,
 Object[] args)

toString

public String toString()

Overrides:

toString in class Object

isStrictMode

private static boolean isStrictMode()

put

public void put(String name,
 Scriptable start,
 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 IdScriptableObject

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)

put

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

Description copied from class: ScriptableObject

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

Specified by:

put in interface Scriptable

Overrides:

put in class ScriptableObject

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)
• ScriptableObject.putProperty(Scriptable, int, Object)
• Context.toObject(Object, Scriptable)

put

public void put(Symbol key,
 Scriptable start,
 Object value)

Description copied from class: ScriptableObject

Implementation of put required by SymbolScriptable objects.

Specified by:

put in interface SymbolScriptable

Overrides:

put in class IdScriptableObject

isSymbol

public boolean isSymbol()

Object() on a Symbol constructs an object which is NOT a symbol, but which has an "internal data slot" that is. Furthermore, such an object has the Symbol prototype so this particular object is still used. Account for that here: an "Object" that was created from a Symbol has a different value of the slot.

getTypeOf

public String getTypeOf()

Description copied from class: ScriptableObject

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

Overrides:

getTypeOf in class ScriptableObject

Returns:

default is "object" unless ScriptableObject.avoidObjectDetection() is true in which case it returns "undefined"

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object x)

Overrides:

equals in class Object

getKey

SymbolKey getKey()

getGlobalMap

private Map<String, NativeSymbol> getGlobalMap()