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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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/* -*- 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
* Frank Mitchell
* Mike Shaver
*
* 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;
/**
* This class reflects Java packages into the JavaScript environment. We
* lazily reflect classes and subpackages, and use a caching/sharing
* system to ensure that members reflected into one JavaPackage appear
* in all other references to the same package (as with Packages.java.lang
* and java.lang).
*
* @author Mike Shaver
* @see NativeJavaArray
* @see NativeJavaObject
* @see NativeJavaClass
*/
public class NativeJavaTopPackage
extends NativeJavaPackage implements Function, IdFunctionCall
{
static final long serialVersionUID = -1455787259477709999L;
// we know these are packages so we can skip the class check
// note that this is ok even if the package isn't present.
private static final String[][] commonPackages = {
{"java", "lang", "reflect"},
{"java", "io"},
{"java", "math"},
{"java", "net"},
{"java", "util", "zip"},
{"java", "text", "resources"},
{"java", "applet"},
{"javax", "swing"}
};
NativeJavaTopPackage(ClassLoader loader)
{
super(true, "", loader);
}
public Object call(Context cx, Scriptable scope, Scriptable thisObj,
Object[] args)
{
return construct(cx, scope, args);
}
public Scriptable construct(Context cx, Scriptable scope, Object[] args)
{
ClassLoader loader = null;
if (args.length != 0) {
Object arg = args[0];
if (arg instanceof Wrapper) {
arg = ((Wrapper)arg).unwrap();
}
if (arg instanceof ClassLoader) {
loader = (ClassLoader)arg;
}
}
if (loader == null) {
Context.reportRuntimeError0("msg.not.classloader");
return null;
}
return new NativeJavaPackage(true, "", loader);
}
public static void init(Context cx, Scriptable scope, boolean sealed)
{
ClassLoader loader = cx.getApplicationClassLoader();
final NativeJavaTopPackage top = new NativeJavaTopPackage(loader);
top.setPrototype(getObjectPrototype(scope));
top.setParentScope(scope);
for (int i = 0; i != commonPackages.length; i++) {
NativeJavaPackage parent = top;
for (int j = 0; j != commonPackages[i].length; j++) {
parent = parent.forcePackage(commonPackages[i][j], scope);
}
}
// getClass implementation
IdFunctionObject getClass = new IdFunctionObject(top, FTAG, Id_getClass,
"getClass", 1, scope);
// We want to get a real alias, and not a distinct JavaPackage
// with the same packageName, so that we share classes and top
// that are underneath.
String[] topNames = { "java", "javax", "org", "com", "edu", "net" };
NativeJavaPackage[] topPackages = new NativeJavaPackage[topNames.length];
for (int i=0; i < topNames.length; i++) {
topPackages[i] = (NativeJavaPackage)top.get(topNames[i], top);
}
// It's safe to downcast here since initStandardObjects takes
// a ScriptableObject.
ScriptableObject global = (ScriptableObject) scope;
if (sealed) {
getClass.sealObject();
}
getClass.exportAsScopeProperty();
global.defineProperty("Packages", top, ScriptableObject.DONTENUM);
for (int i=0; i < topNames.length; i++) {
global.defineProperty(topNames[i], topPackages[i],
ScriptableObject.DONTENUM);
}
}
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (f.hasTag(FTAG)) {
if (f.methodId() == Id_getClass) {
return js_getClass(cx, scope, args);
}
}
throw f.unknown();
}
private Scriptable js_getClass(Context cx, Scriptable scope, Object[] args)
{
if (args.length > 0 && args[0] instanceof Wrapper) {
Scriptable result = this;
Class cl = ((Wrapper) args[0]).unwrap().getClass();
// Evaluate the class name by getting successive properties of
// the string to find the appropriate NativeJavaClass object
String name = cl.getName();
int offset = 0;
for (;;) {
int index = name.indexOf('.', offset);
String propName = index == -1
? name.substring(offset)
: name.substring(offset, index);
Object prop = result.get(propName, result);
if (!(prop instanceof Scriptable))
break; // fall through to error
result = (Scriptable) prop;
if (index == -1)
return result;
offset = index+1;
}
}
throw Context.reportRuntimeError0("msg.not.java.obj");
}
private static final Object FTAG = "JavaTopPackage";
private static final int Id_getClass = 1;
}