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

Fields

Modifier and Type	Field and Description
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

Constructors

Constructor and Description
ScriptableObject()
ScriptableObject(Scriptable scope, Scriptable prototype)

Method Summary

Methods

Modifier and Type	Method and Description
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.
protected void	checkPropertyChange(java.lang.String id, ScriptableObject current, ScriptableObject desc)
protected void	checkPropertyDefinition(ScriptableObject desc)
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) Defines one or more properties on this object.
void	defineOwnProperty(Context cx, java.lang.Object id, ScriptableObject desc) Defines a property on an object.
protected void	defineOwnProperty(Context cx, java.lang.Object id, ScriptableObject desc, boolean checkValid) Defines a property on an object.
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 static Scriptable	ensureScriptable(java.lang.Object arg)
protected static 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) Implements IsAccessorDescriptor as described in ES5 8.10.1
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) Implements IsDataDescriptor as described in ES5 8.10.2
boolean	isEmpty()
boolean	isExtensible()
protected static boolean	isFalse(java.lang.Object value)
protected boolean	isGenericDescriptor(ScriptableObject desc) Implements IsGenericDescriptor as described in ES5 8.10.3
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.
protected boolean	sameValue(java.lang.Object newValue, java.lang.Object currentValue) Implements SameValue as described in ES5 9.12, additionally checking if new value is defined.
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)

Defines one or more properties on this object.

Parameters:

cx - the current Context

props - a map of property ids to property descriptors

defineOwnProperty

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

Defines a property on an object.

Parameters:

cx - the current Context

id - the name/index of the property

desc - the new property descriptor, as described in 8.6.1

defineOwnProperty

protected void defineOwnProperty(Context cx,
                     java.lang.Object id,
                     ScriptableObject desc,
                     boolean checkValid)

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

checkValid - whether to perform validity checks

checkPropertyDefinition

protected void checkPropertyDefinition(ScriptableObject desc)

checkPropertyChange

protected void checkPropertyChange(java.lang.String id,
                       ScriptableObject current,
                       ScriptableObject desc)

isTrue

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

isFalse

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

sameValue

protected boolean sameValue(java.lang.Object newValue,
                java.lang.Object currentValue)

Implements SameValue as described in ES5 9.12, additionally checking if new value is defined.

Parameters:

newValue - the new value

currentValue - the current value

Returns:

true if values are the same as defined by ES5 9.12

applyDescriptorToAttributeBitset

protected int applyDescriptorToAttributeBitset(int attributes,
                                   ScriptableObject desc)

isDataDescriptor

protected boolean isDataDescriptor(ScriptableObject desc)

Implements IsDataDescriptor as described in ES5 8.10.2

Parameters:

desc - a property descriptor

Returns:

true if this is a data descriptor.

isAccessorDescriptor

protected boolean isAccessorDescriptor(ScriptableObject desc)

Implements IsAccessorDescriptor as described in ES5 8.10.1

Parameters:

desc - a property descriptor

Returns:

true if this is an accessor descriptor.

isGenericDescriptor

protected boolean isGenericDescriptor(ScriptableObject desc)

Implements IsGenericDescriptor as described in ES5 8.10.3

Parameters:

desc - a property descriptor

Returns:

true if this is a generic descriptor.

ensureScriptable

protected static Scriptable ensureScriptable(java.lang.Object arg)

ensureScriptableObject

protected static 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)