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139 lines (114 loc) · 3.88 KB
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* 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 Netscape are
* Copyright (C) 1997-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Norris Boyd
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (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 NPL, indicate your decision by
* deleting the provisions above and replace 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 NPL or the GPL.
*/
package org.mozilla.javascript;
/**
* This class implements the Undefined value in JavaScript.
*/
public class Undefined implements Scriptable {
static final public Scriptable instance = new Undefined();
public String getClassName() {
return "undefined";
}
public boolean has(String id, Scriptable start) {
return false;
}
public boolean has(int index, Scriptable start) {
return false;
}
public Object get(String id, Scriptable start) {
throw reportError();
}
public Object get(int index, Scriptable start) {
throw reportError();
}
public void put(String id,Scriptable start, Object value) {
throw reportError();
}
public void put(int index, Scriptable start, Object value) {
throw reportError();
}
public void delete(String id) {
throw reportError();
}
public void delete(int index) {
throw reportError();
}
public short getAttributes(String id, Scriptable start) {
throw reportError();
}
public short getAttributes(int index, Scriptable start) {
throw reportError();
}
public void setAttributes(String id, Scriptable start, short attributes) {
throw reportError();
}
public void setAttributes(int index, Scriptable start, short attributes) {
throw reportError();
}
public Scriptable getPrototype() {
throw reportError();
}
public void setPrototype(Scriptable prototype) {
throw reportError();
}
public Scriptable getParentScope() {
throw reportError();
}
public void setParentScope(Scriptable parent) {
throw reportError();
}
public Object[] getIds() {
throw reportError();
}
public Object getDefaultValue(Class cl) {
if (cl == ScriptRuntime.StringClass)
return "undefined";
if (cl == ScriptRuntime.NumberClass)
return ScriptRuntime.NaNobj;
if (cl == ScriptRuntime.BooleanClass)
return Boolean.FALSE;
return this;
}
public boolean hasInstance(Scriptable value) {
throw reportError();
}
public boolean instanceOf(Scriptable prototype) {
return false;
}
private RuntimeException reportError() {
String message = Context.getMessage("msg.undefined", null);
return Context.reportRuntimeError(message);
}
}