votorola.g.web.gwt

Class JavaScriptObjectX

java.lang.Object

com.google.gwt.core.client.JavaScriptObject

JavaScriptObjectX

Direct Known Subclasses:

DiffLookJS, DiffMessageJS, JsMap, SacJS, TheatrePageJS

public class JavaScriptObjectX
extends JavaScriptObject

An extended handle to a native JavaScript object.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JavaScriptObjectX()

Method Summary

Methods

Modifier and Type	Method and Description
JsArrayString	_enumerablePropertyNames() Returns the names of all enumerable properties of this object, including any inherited ones.
Iterable<String>	_in() Constructs an iterable over the enumerable property names of this object.
static boolean	_isDuckType(JavaScriptObject js, String... ownPropertyNames) Answers whether the specified object looks like an instance of a particular JavaScriptObject subclass defined by the names of its non-inherited, own properties.
static boolean	_isDuckType(Object o, String... ownPropertyNames) Answers whether the specified object looks like an instance of a particular JavaScriptObject subclass defined by the names of its non-inherited, own properties.

Methods inherited from class com.google.gwt.core.client.JavaScriptObject

_delete, _get, _getBoolean, _getByte, _getChar, _getDouble, _getFloat, _getInt, _getShort, _getString, _hasOwnProperty, _hasProperty, _propertyIsEnumerable, _set, _setBoolean, _setByte, _setChar, _setDouble, _setFloat, _setInt, _setShort, _setString, cast, createArray, createArray, createFunction, createObject, equals, hashCode, toSource, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaScriptObjectX

protected JavaScriptObjectX()

Method Detail

_enumerablePropertyNames

public final JsArrayString _enumerablePropertyNames()

Returns the names of all enumerable properties of this object, including any inherited ones.

See Also:

_in(), JavaScriptObject._propertyIsEnumerable(String)

_isDuckType

public static boolean _isDuckType(JavaScriptObject js,
                  String... ownPropertyNames)

Answers whether the specified object looks like an instance of a particular JavaScriptObject subclass defined by the names of its non-inherited, own properties. Returns true if it might be an instance, false if it definitely is not. This duck typing is required for instances of JavaScriptObject because they are typeless at runtime, having only compile-time "overlay typing".

See Also:

Overlay typing and instanceof operator

_isDuckType

public static boolean _isDuckType(Object o,
                  String... ownPropertyNames)

Answers whether the specified object looks like an instance of a particular JavaScriptObject subclass defined by the names of its non-inherited, own properties. Returns true if it might be an instance, false if it definitely is not. This duck typing is required for instances of JavaScriptObject because they are typeless at runtime, having only compile-time "overlay typing".

See Also:

Overlay typing and instanceof operator

_in

public final Iterable<String> _in()

Constructs an iterable over the enumerable property names of this object. This allows for iteration over the property names of the underlying JavaScript object (o), using something like JavaScript's for/in syntax:

     for( var name in o ) window.alert( name ); // JavaScript

The ideal equivalent in Java would probably be a foreach loop over an iterable JavaScriptObject (jso), similar to this:

     for( String name: jso ) Window.alert( name ); // not possible

But that is not possible because a GWT bug prevents JavaScriptObject from implementing Iterable. Hence this method, which allows for iteration over a JavaScriptObjectX (jsox) like this:

     for( String name: jsox._in() ) Window.alert( name );

See Also:

_enumerablePropertyNames(), JavaScriptObject with Iterable<T> breaks Development Mode