/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Norris Boyd
* Raphael Speyer
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript;
/**
* The class for results of the Function.bind operation
* EcmaScript 5 spec, 15.3.4.5
* @author Raphael Speyer
*/
public class BoundFunction extends BaseFunction {
private final Callable targetFunction;
private final Scriptable boundThis;
private final Object[] boundArgs;
private final int length;
public BoundFunction(Context cx, Scriptable scope, Callable targetFunction, Scriptable boundThis,
Object[] boundArgs)
{
this.targetFunction = targetFunction;
this.boundThis = boundThis;
this.boundArgs = boundArgs;
if (targetFunction instanceof BaseFunction) {
length = Math.max(0, ((BaseFunction) targetFunction).getLength() - boundArgs.length);
} else {
length = 0;
}
ScriptRuntime.setFunctionProtoAndParent(this, scope);
Function thrower = ScriptRuntime.typeErrorThrower();
NativeObject throwing = new NativeObject();
throwing.put("get", throwing, thrower);
throwing.put("set", throwing, thrower);
throwing.put("enumerable", throwing, false);
throwing.put("configurable", throwing, false);
throwing.preventExtensions();
this.defineOwnProperty(cx, "caller", throwing);
this.defineOwnProperty(cx, "arguments", throwing);
}
@Override
public Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] extraArgs)
{
Scriptable callThis = boundThis != null ? boundThis : ScriptRuntime.getTopCallScope(cx);
return targetFunction.call(cx, scope, callThis, concat(boundArgs, extraArgs));
}
@Override
public Scriptable construct(Context cx, Scriptable scope, Object[] extraArgs) {
if (targetFunction instanceof Function) {
return ((Function) targetFunction).construct(cx, scope, concat(boundArgs, extraArgs));
}
throw ScriptRuntime.typeError0("msg.not.ctor");
}
@Override
public boolean hasInstance(Scriptable instance) {
if (targetFunction instanceof Function) {
return ((Function) targetFunction).hasInstance(instance);
}
throw ScriptRuntime.typeError0("msg.not.ctor");
}
@Override
public int getLength() {
return length;
}
private Object[] concat(Object[] first, Object[] second) {
Object[] args = new Object[first.length + second.length];
System.arraycopy(first, 0, args, 0, first.length);
System.arraycopy(second, 0, args, first.length, second.length);
return args;
}
}