Package org.mozilla.javascript

Class WrapFactory

java.lang.Object

org.mozilla.javascript.WrapFactory

public class WrapFactory
extends Object

Embeddings that wish to provide their own custom wrappings for Java objects may extend this class and call Context.setWrapFactory(WrapFactory) Once an instance of this class or an extension of this class is enabled for a given context (by calling setWrapFactory on that context), Rhino will call the methods of this class whenever it needs to wrap a value resulting from a call to a Java method or an access to a Java field.

Since:

1.5 Release 4

See Also:

Context.setWrapFactory(WrapFactory)

Constructor Summary

Constructors

Constructor	Description
WrapFactory()

Method Summary

Modifier and Type	Method	Description
boolean	isJavaPrimitiveWrap()	Return false if result of Java method, which is instance of String, Number, Boolean and Character, should be used directly as JavaScript primitive type.
void	setJavaPrimitiveWrap(boolean value)
Object	wrap(Context cx, Scriptable scope, Object obj, Class<?> staticType)	Wrap the object.
Scriptable	wrapAsJavaObject(Context cx, Scriptable scope, Object javaObject, Class<?> staticType)	Wrap Java object as Scriptable instance to allow full access to its methods and fields from JavaScript.
Scriptable	wrapJavaClass(Context cx, Scriptable scope, Class<?> javaClass)	Wrap a Java class as Scriptable instance to allow access to its static members and fields and use as constructor from JavaScript.
Scriptable	wrapNewObject(Context cx, Scriptable scope, Object obj)	Wrap an object newly created by a constructor call.

Methods inherited from class java.lang.Object

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

Constructor Detail

WrapFactory

public WrapFactory()

Method Detail

wrap

public Object wrap(Context cx,
                   Scriptable scope,
                   Object obj,
                   Class<?> staticType)

Wrap the object.

The value returned must be one of

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

Parameters:

cx - the current Context for this thread

scope - the scope of the executing script

obj - the object to be wrapped. Note it can be null.

staticType - type hint. If security restrictions prevent to wrap object based on its class, staticType will be used instead.

Returns:

the wrapped value.

wrapNewObject

public Scriptable wrapNewObject(Context cx,
                                Scriptable scope,
                                Object obj)

Wrap an object newly created by a constructor call.

Parameters:

cx - the current Context for this thread

scope - the scope of the executing script

obj - the object to be wrapped

Returns:

the wrapped value.

wrapAsJavaObject

public Scriptable wrapAsJavaObject(Context cx,
                                   Scriptable scope,
                                   Object javaObject,
                                   Class<?> staticType)

Wrap Java object as Scriptable instance to allow full access to its methods and fields from JavaScript.

wrap(Context, Scriptable, Object, Class) and wrapNewObject(Context, Scriptable, Object) call this method when they can not convert javaObject to JavaScript primitive value or JavaScript array.

Subclasses can override the method to provide custom wrappers for Java objects.

Parameters:

cx - the current Context for this thread

scope - the scope of the executing script

javaObject - the object to be wrapped

staticType - type hint. If security restrictions prevent to wrap object based on its class, staticType will be used instead.

Returns:

the wrapped value which shall not be null

wrapJavaClass

public Scriptable wrapJavaClass(Context cx,
                                Scriptable scope,
                                Class<?> javaClass)

Wrap a Java class as Scriptable instance to allow access to its static members and fields and use as constructor from JavaScript.

Subclasses can override this method to provide custom wrappers for Java classes.

Parameters:

cx - the current Context for this thread

scope - the scope of the executing script

javaClass - the class to be wrapped

Returns:

the wrapped value which shall not be null

Since:

1.7R3

isJavaPrimitiveWrap

public final boolean isJavaPrimitiveWrap()

Return false if result of Java method, which is instance of String, Number, Boolean and Character, should be used directly as JavaScript primitive type. By default the method returns true to indicate that instances of String, Number, Boolean and Character should be wrapped as any other Java object and scripts can access any Java method available in these objects. Use setJavaPrimitiveWrap(boolean) to change this.

setJavaPrimitiveWrap

public final void setJavaPrimitiveWrap(boolean value)

See Also:

isJavaPrimitiveWrap()