267 lines
8.0 KiB
Java
267 lines
8.0 KiB
Java
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Delegator.java, released
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* Sep 27, 2000.
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*
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* The Initial Developer of the Original Code is
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* Matthias Radestock. <matthias@sorted.org>.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License Version 2 or later (the "GPL"), in which
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* case the provisions of the GPL are applicable instead of those above. If
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* you wish to allow use of your version of this file only under the terms of
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* the GPL and not to allow others to use your version of this file under the
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* MPL, indicate your decision by deleting the provisions above and replacing
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* them with the notice and other provisions required by the GPL. If you do
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* not delete the provisions above, a recipient may use your version of this
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* file under either the MPL or the GPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// API class
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package org.mozilla.javascript;
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/**
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* This is a helper class for implementing wrappers around Scriptable
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* objects. It implements the Function interface and delegates all
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* invocations to a delegee Scriptable object. The normal use of this
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* class involves creating a sub-class and overriding one or more of
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* the methods.
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*
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* A useful application is the implementation of interceptors,
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* pre/post conditions, debugging.
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*
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* @see Function
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* @see Scriptable
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* @author Matthias Radestock
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*/
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public class Delegator implements Function {
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protected Scriptable obj = null;
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/**
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* Create a Delegator prototype.
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*
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* This constructor should only be used for creating prototype
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* objects of Delegator.
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*
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* @see org.mozilla.javascript.Delegator#construct
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*/
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public Delegator() {
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}
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/**
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* Create a new Delegator that forwards requests to a delegee
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* Scriptable object.
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*
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* @param obj the delegee
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* @see org.mozilla.javascript.Scriptable
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*/
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public Delegator(Scriptable obj) {
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this.obj = obj;
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}
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/**
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* Crete new Delegator instance.
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* The default implementation calls this.getClass().newInstance().
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*
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* @see #construct(Context cx, Scriptable scope, Object[] args)
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*/
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protected Delegator newInstance()
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{
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try {
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return this.getClass().newInstance();
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} catch (Exception ex) {
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throw Context.throwAsScriptRuntimeEx(ex);
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}
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}
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/**
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* Retrieve the delegee.
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*
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* @return the delegee
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*/
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public Scriptable getDelegee() {
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return obj;
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}
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/**
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* Set the delegee.
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*
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* @param obj the delegee
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* @see org.mozilla.javascript.Scriptable
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*/
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public void setDelegee(Scriptable obj) {
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this.obj = obj;
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}
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/**
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* @see org.mozilla.javascript.Scriptable#getClassName
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*/
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public String getClassName() {
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return obj.getClassName();
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}
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/**
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* @see org.mozilla.javascript.Scriptable#get(String, Scriptable)
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*/
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public Object get(String name, Scriptable start) {
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return obj.get(name,start);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#get(int, Scriptable)
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*/
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public Object get(int index, Scriptable start) {
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return obj.get(index,start);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#has(String, Scriptable)
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*/
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public boolean has(String name, Scriptable start) {
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return obj.has(name,start);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#has(int, Scriptable)
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*/
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public boolean has(int index, Scriptable start) {
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return obj.has(index,start);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#put(String, Scriptable, Object)
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*/
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public void put(String name, Scriptable start, Object value) {
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obj.put(name,start,value);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#put(int, Scriptable, Object)
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*/
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public void put(int index, Scriptable start, Object value) {
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obj.put(index,start,value);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#delete(String)
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*/
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public void delete(String name) {
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obj.delete(name);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#delete(int)
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*/
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public void delete(int index) {
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obj.delete(index);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#getPrototype
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*/
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public Scriptable getPrototype() {
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return obj.getPrototype();
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}
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/**
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* @see org.mozilla.javascript.Scriptable#setPrototype
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*/
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public void setPrototype(Scriptable prototype) {
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obj.setPrototype(prototype);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#getParentScope
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*/
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public Scriptable getParentScope() {
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return obj.getParentScope();
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}
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/**
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* @see org.mozilla.javascript.Scriptable#setParentScope
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*/
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public void setParentScope(Scriptable parent) {
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obj.setParentScope(parent);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#getIds
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*/
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public Object[] getIds() {
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return obj.getIds();
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}
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/**
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* Note that this method does not get forwarded to the delegee if
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* the <code>hint</code> parameter is null,
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* <code>ScriptRuntime.ScriptableClass</code> or
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* <code>ScriptRuntime.FunctionClass</code>. Instead the object
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* itself is returned.
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*
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* @param hint the type hint
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* @return the default value
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*
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* @see org.mozilla.javascript.Scriptable#getDefaultValue
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*/
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public Object getDefaultValue(Class<?> hint) {
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return (hint == null ||
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hint == ScriptRuntime.ScriptableClass ||
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hint == ScriptRuntime.FunctionClass) ?
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this : obj.getDefaultValue(hint);
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}
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/**
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* @see org.mozilla.javascript.Scriptable#hasInstance
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*/
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public boolean hasInstance(Scriptable instance) {
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return obj.hasInstance(instance);
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}
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/**
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* @see org.mozilla.javascript.Function#call
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*/
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public Object call(Context cx, Scriptable scope, Scriptable thisObj,
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Object[] args)
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{
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return ((Function)obj).call(cx,scope,thisObj,args);
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}
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/**
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* Note that if the <code>delegee</code> is <code>null</code>,
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* this method creates a new instance of the Delegator itself
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* rathert than forwarding the call to the
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* <code>delegee</code>. This permits the use of Delegator
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* prototypes.
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*
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* @param cx the current Context for this thread
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* @param scope an enclosing scope of the caller except
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* when the function is called from a closure.
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* @param args the array of arguments
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* @return the allocated object
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*
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* @see Function#construct(Context, Scriptable, Object[])
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*/
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public Scriptable construct(Context cx, Scriptable scope, Object[] args)
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{
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if (obj == null) {
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//this little trick allows us to declare prototype objects for
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//Delegators
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Delegator n = newInstance();
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Scriptable delegee;
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if (args.length == 0) {
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delegee = new NativeObject();
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} else {
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delegee = ScriptRuntime.toObject(cx, scope, args[0]);
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}
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n.setDelegee(delegee);
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return n;
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}
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else {
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return ((Function)obj).construct(cx,scope,args);
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}
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}
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}
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