325 lines
11 KiB
Java
325 lines
11 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 Rhino code, released
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* May 6, 1999.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Norris Boyd
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* Igor Bukanov
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* Matthias Radestock
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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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* Class ImporterTopLevel
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*
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* This class defines a ScriptableObject that can be instantiated
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* as a top-level ("global") object to provide functionality similar
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* to Java's "import" statement.
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* <p>
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* This class can be used to create a top-level scope using the following code:
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* <pre>
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* Scriptable scope = new ImporterTopLevel(cx);
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* </pre>
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* Then JavaScript code will have access to the following methods:
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* <ul>
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* <li>importClass - will "import" a class by making its unqualified name
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* available as a property of the top-level scope
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* <li>importPackage - will "import" all the classes of the package by
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* searching for unqualified names as classes qualified
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* by the given package.
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* </ul>
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* The following code from the shell illustrates this use:
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* <pre>
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* js> importClass(java.io.File)
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* js> f = new File('help.txt')
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* help.txt
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* js> importPackage(java.util)
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* js> v = new Vector()
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* []
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*
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* @author Norris Boyd
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*/
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public class ImporterTopLevel extends IdScriptableObject
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{
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static final long serialVersionUID = -9095380847465315412L;
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private static final Object IMPORTER_TAG = "Importer";
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public ImporterTopLevel() { }
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public ImporterTopLevel(Context cx) {
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this(cx, false);
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}
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public ImporterTopLevel(Context cx, boolean sealed)
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{
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initStandardObjects(cx, sealed);
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}
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@Override
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public String getClassName()
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{
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return (topScopeFlag) ? "global" : "JavaImporter";
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}
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public static void init(Context cx, Scriptable scope, boolean sealed)
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{
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ImporterTopLevel obj = new ImporterTopLevel();
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obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
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}
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public void initStandardObjects(Context cx, boolean sealed)
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{
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// Assume that Context.initStandardObjects initialize JavaImporter
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// property lazily so the above init call is not yet called
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cx.initStandardObjects(this, sealed);
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topScopeFlag = true;
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// If seal is true then exportAsJSClass(cx, seal) would seal
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// this obj. Since this is scope as well, it would not allow
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// to add variables.
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IdFunctionObject ctor = exportAsJSClass(MAX_PROTOTYPE_ID, this, false);
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if (sealed) {
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ctor.sealObject();
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}
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// delete "constructor" defined by exportAsJSClass so "constructor"
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// name would refer to Object.constructor
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// and not to JavaImporter.prototype.constructor.
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delete("constructor");
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}
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@Override
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public boolean has(String name, Scriptable start) {
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return super.has(name, start)
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|| getPackageProperty(name, start) != NOT_FOUND;
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}
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@Override
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public Object get(String name, Scriptable start) {
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Object result = super.get(name, start);
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if (result != NOT_FOUND)
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return result;
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result = getPackageProperty(name, start);
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return result;
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}
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private Object getPackageProperty(String name, Scriptable start) {
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Object result = NOT_FOUND;
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Object[] elements;
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synchronized (importedPackages) {
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elements = importedPackages.toArray();
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}
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for (int i=0; i < elements.length; i++) {
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NativeJavaPackage p = (NativeJavaPackage) elements[i];
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Object v = p.getPkgProperty(name, start, false);
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if (v != null && !(v instanceof NativeJavaPackage)) {
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if (result == NOT_FOUND) {
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result = v;
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} else {
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throw Context.reportRuntimeError2(
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"msg.ambig.import", result.toString(), v.toString());
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}
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}
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}
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return result;
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}
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/**
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* @deprecated Kept only for compatibility.
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*/
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public void importPackage(Context cx, Scriptable thisObj, Object[] args,
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Function funObj)
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{
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js_importPackage(args);
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}
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private Object js_construct(Scriptable scope, Object[] args)
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{
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ImporterTopLevel result = new ImporterTopLevel();
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for (int i = 0; i != args.length; ++i) {
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Object arg = args[i];
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if (arg instanceof NativeJavaClass) {
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result.importClass((NativeJavaClass)arg);
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} else if (arg instanceof NativeJavaPackage) {
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result.importPackage((NativeJavaPackage)arg);
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} else {
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throw Context.reportRuntimeError1(
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"msg.not.class.not.pkg", Context.toString(arg));
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}
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}
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// set explicitly prototype and scope
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// as otherwise in top scope mode BaseFunction.construct
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// would keep them set to null. It also allow to use
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// JavaImporter without new and still get properly
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// initialized object.
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result.setParentScope(scope);
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result.setPrototype(this);
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return result;
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}
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private Object js_importClass(Object[] args)
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{
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for (int i = 0; i != args.length; i++) {
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Object arg = args[i];
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if (!(arg instanceof NativeJavaClass)) {
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throw Context.reportRuntimeError1(
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"msg.not.class", Context.toString(arg));
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}
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importClass((NativeJavaClass)arg);
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}
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return Undefined.instance;
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}
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private Object js_importPackage(Object[] args)
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{
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for (int i = 0; i != args.length; i++) {
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Object arg = args[i];
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if (!(arg instanceof NativeJavaPackage)) {
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throw Context.reportRuntimeError1(
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"msg.not.pkg", Context.toString(arg));
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}
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importPackage((NativeJavaPackage)arg);
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}
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return Undefined.instance;
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}
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private void importPackage(NativeJavaPackage pkg)
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{
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if(pkg == null) {
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return;
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}
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synchronized (importedPackages) {
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for (int j = 0; j != importedPackages.size(); j++) {
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if (pkg.equals(importedPackages.get(j))) {
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return;
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}
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}
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importedPackages.add(pkg);
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}
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}
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private void importClass(NativeJavaClass cl)
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{
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String s = cl.getClassObject().getName();
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String n = s.substring(s.lastIndexOf('.')+1);
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Object val = get(n, this);
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if (val != NOT_FOUND && val != cl) {
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throw Context.reportRuntimeError1("msg.prop.defined", n);
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}
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//defineProperty(n, cl, DONTENUM);
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put(n, this, cl);
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}
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@Override
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protected void initPrototypeId(int id)
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{
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String s;
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int arity;
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switch (id) {
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case Id_constructor: arity=0; s="constructor"; break;
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case Id_importClass: arity=1; s="importClass"; break;
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case Id_importPackage: arity=1; s="importPackage"; break;
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default: throw new IllegalArgumentException(String.valueOf(id));
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}
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initPrototypeMethod(IMPORTER_TAG, id, s, arity);
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}
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@Override
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public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
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Scriptable thisObj, Object[] args)
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{
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if (!f.hasTag(IMPORTER_TAG)) {
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return super.execIdCall(f, cx, scope, thisObj, args);
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}
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int id = f.methodId();
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switch (id) {
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case Id_constructor:
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return js_construct(scope, args);
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case Id_importClass:
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return realThis(thisObj, f).js_importClass(args);
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case Id_importPackage:
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return realThis(thisObj, f).js_importPackage(args);
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}
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throw new IllegalArgumentException(String.valueOf(id));
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}
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private ImporterTopLevel realThis(Scriptable thisObj, IdFunctionObject f)
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{
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if (topScopeFlag) {
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// when used as top scope importPackage and importClass are global
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// function that ignore thisObj
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return this;
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}
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if (!(thisObj instanceof ImporterTopLevel))
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throw incompatibleCallError(f);
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return (ImporterTopLevel)thisObj;
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}
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// #string_id_map#
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@Override
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protected int findPrototypeId(String s)
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{
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int id;
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// #generated# Last update: 2007-05-09 08:15:24 EDT
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L0: { id = 0; String X = null; int c;
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int s_length = s.length();
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if (s_length==11) {
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c=s.charAt(0);
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if (c=='c') { X="constructor";id=Id_constructor; }
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else if (c=='i') { X="importClass";id=Id_importClass; }
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}
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else if (s_length==13) { X="importPackage";id=Id_importPackage; }
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if (X!=null && X!=s && !X.equals(s)) id = 0;
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break L0;
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}
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// #/generated#
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return id;
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}
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private static final int
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Id_constructor = 1,
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Id_importClass = 2,
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Id_importPackage = 3,
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MAX_PROTOTYPE_ID = 3;
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// #/string_id_map#
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private ObjArray importedPackages = new ObjArray();
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private boolean topScopeFlag;
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}
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