org.mozilla.javascript

Class NativeJavaArray

java.lang.Object

org.mozilla.javascript.NativeJavaObject

org.mozilla.javascript.NativeJavaArray

All Implemented Interfaces:

java.io.Serializable, Scriptable, Wrapper

public class NativeJavaArray
extends NativeJavaObject

This class reflects Java arrays into the JavaScript environment.

Author:

Mike Shaver

See Also:

NativeJavaClass, NativeJavaObject, NativeJavaPackage, Serialized Form

Field Summary

Fields inherited from class org.mozilla.javascript.NativeJavaObject

isAdapter, javaObject, members, parent, prototype, staticType

Fields inherited from interface org.mozilla.javascript.Scriptable

NOT_FOUND

Constructor Summary

Constructors

Constructor and Description
NativeJavaArray(Scriptable scope, java.lang.Object array)

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	get(int index, Scriptable start) Get a property from the object selected by an integral index.
java.lang.Object	get(java.lang.String id, Scriptable start) Get a named property from the object.
java.lang.String	getClassName() Get the name of the set of objects implemented by this Java class.
java.lang.Object	getDefaultValue(java.lang.Class<?> hint) Get the default value of the object with a given hint.
java.lang.Object[]	getIds() Get an array of property ids.
Scriptable	getPrototype() Get the prototype of the object.
boolean	has(int index, Scriptable start) Indicates whether or not an indexed property is defined in an object.
boolean	has(java.lang.String id, Scriptable start) Indicates whether or not a named property is defined in an object.
boolean	hasInstance(Scriptable value) The instanceof operator.
void	put(int index, Scriptable start, java.lang.Object value) Sets an indexed property in this object.
void	put(java.lang.String id, Scriptable start, java.lang.Object value) Sets a named property in this object.
java.lang.Object	unwrap() Unwrap the object by returning the wrapped value.
static NativeJavaArray	wrap(Scriptable scope, java.lang.Object array)

Methods inherited from class org.mozilla.javascript.NativeJavaObject

canConvert, coerceType, createInterfaceAdapter, delete, delete, getParentScope, initMembers, setParentScope, setPrototype, wrap

Methods inherited from class java.lang.Object

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

Constructor Detail

NativeJavaArray

public NativeJavaArray(Scriptable scope,
               java.lang.Object array)

Method Detail

getClassName

public java.lang.String getClassName()

Description copied from interface: Scriptable

Get the name of the set of objects implemented by this Java class. This corresponds to the [[Class]] operation in ECMA and is used by Object.prototype.toString() in ECMA.

See ECMA 8.6.2 and 15.2.4.2.

Specified by:

getClassName in interface Scriptable

Overrides:

getClassName in class NativeJavaObject

wrap

public static NativeJavaArray wrap(Scriptable scope,
                   java.lang.Object array)

unwrap

public java.lang.Object unwrap()

Description copied from interface: Wrapper

Unwrap the object by returning the wrapped value.

Specified by:

unwrap in interface Wrapper

Overrides:

unwrap in class NativeJavaObject

Returns:

a wrapped value

has

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

Description copied from interface: Scriptable

Indicates whether or not a named property is defined in an object. Does not traverse the prototype chain.

The property is specified by a String name as defined for the get method.

Specified by:

has in interface Scriptable

Overrides:

has in class NativeJavaObject

Parameters:

id - the name of the property

start - the object in which the lookup began

Returns:

true if and only if the named property is found in the object

See Also:

Scriptable.get(String, Scriptable), ScriptableObject.getProperty(Scriptable, String)

has

public boolean has(int index,
          Scriptable start)

Description copied from interface: Scriptable

Indicates whether or not an indexed property is defined in an object. Does not traverse the prototype chain.

The property is specified by an integral index as defined for the get method.

Specified by:

has in interface Scriptable

Overrides:

has in class NativeJavaObject

Parameters:

index - the numeric index for the property

start - the object in which the lookup began

Returns:

true if and only if the indexed property is found in the object

See Also:

Scriptable.get(int, Scriptable), ScriptableObject.getProperty(Scriptable, int)

get

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

Description copied from interface: Scriptable

Get a named property from the object. Looks property up in this object and returns the associated value if found. Returns NOT_FOUND if not found. Note that this method is not expected to traverse the prototype chain. This is different from the ECMA [[Get]] operation. Depending on the property selector, the runtime will call this method or the form of get that takes an integer:

JavaScript code	Java code
a.b	a.get("b", a)
a["foo"]	a.get("foo", a)
a[3]	a.get(3, a)
a["3"]	a.get(3, a)
a[3.0]	a.get(3, a)
a["3.0"]	a.get("3.0", a)
a[1.1]	a.get("1.1", a)
a[-4]	a.get(-4, a)

The values that may be returned are limited to the following:

• java.lang.Boolean objects
• java.lang.String objects
• java.lang.Number objects
• org.mozilla.javascript.Scriptable objects
• null
• The value returned by Context.getUndefinedValue()
• NOT_FOUND

Specified by:

get in interface Scriptable

Overrides:

get in class NativeJavaObject

Parameters:

id - 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)

Description copied from interface: Scriptable

Get a property from the object selected by an integral index. Identical to get(String, Scriptable) except that an integral index is used to select the property.

Specified by:

get in interface Scriptable

Overrides:

get in class NativeJavaObject

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 id,
       Scriptable start,
       java.lang.Object value)

Description copied from interface: Scriptable

Sets a named property in this object.

The property is specified by a string name as defined for get.

The possible values that may be passed in are as defined for get. A class that implements this method may choose to ignore calls to set certain properties, in which case those properties are effectively read-only.

For properties defined in a prototype chain, use putProperty in ScriptableObject.

Note that if a property a is defined in the prototype p of an object o, then evaluating o.a = 23 will cause set to be called on the prototype p with o as the start parameter. To preserve JavaScript semantics, it is the Scriptable object's responsibility to modify o.

This design allows properties to be defined in prototypes and implemented in terms of getters and setters of Java values without consuming slots in each instance.

The values that may be set are limited to the following:

• java.lang.Boolean objects
• java.lang.String objects
• java.lang.Number objects
• org.mozilla.javascript.Scriptable objects
• null
• The value returned by Context.getUndefinedValue()

Arbitrary Java objects may be wrapped in a Scriptable by first calling Context.toObject. This allows the property of a JavaScript object to contain an arbitrary Java object as a value.

Note that has will be called by the runtime first before set is called to determine in which object the property is defined. Note that this method is not expected to traverse the prototype chain, which is different from the ECMA [[Put]] operation.

Specified by:

put in interface Scriptable

Overrides:

put in class NativeJavaObject

Parameters:

id - 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,
       java.lang.Object value)

Description copied from interface: Scriptable

Sets an indexed property in this object.

The property is specified by an integral index as defined for get.

Identical to put(String, Scriptable, Object) except that an integral index is used to select the property.

Specified by:

put in interface Scriptable

Overrides:

put in class NativeJavaObject

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)

getDefaultValue

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

Description copied from interface: Scriptable

Get the default value of the object with a given hint. The hints are String.class for type String, Number.class for type Number, Scriptable.class for type Object, and Boolean.class for type Boolean.

A hint of null means "no hint". See ECMA 8.6.2.6.

Specified by:

getDefaultValue in interface Scriptable

Overrides:

getDefaultValue in class NativeJavaObject

Parameters:

hint - the type hint

Returns:

the default value

getIds

public java.lang.Object[] getIds()

Description copied from interface: Scriptable

Get an array of property ids. Not all property ids need be returned. Those properties whose ids are not returned are considered non-enumerable.

Specified by:

getIds in interface Scriptable

Overrides:

getIds in class NativeJavaObject

Returns:

an array of Objects. Each entry in the array is either a java.lang.String or a java.lang.Number

hasInstance

public boolean hasInstance(Scriptable value)

Description copied from interface: Scriptable

The instanceof operator.

The JavaScript code "lhs instanceof rhs" causes rhs.hasInstance(lhs) to be called.

The return value is implementation dependent so that embedded host objects can return an appropriate value. See the JS 1.3 language documentation for more detail.

This operator corresponds to the proposed EMCA [[HasInstance]] operator.

Specified by:

hasInstance in interface Scriptable

Overrides:

hasInstance in class NativeJavaObject

Parameters:

value - The value that appeared on the LHS of the instanceof operator

Returns:

an implementation dependent value

getPrototype

public Scriptable getPrototype()

Description copied from interface: Scriptable

Get the prototype of the object.

Specified by:

getPrototype in interface Scriptable

Overrides:

getPrototype in class NativeJavaObject

Returns:

the prototype