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Diffstat (limited to 'trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/VMBridge.java')
| -rw-r--r-- | trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/VMBridge.java | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/VMBridge.java b/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/VMBridge.java new file mode 100644 index 0000000..5fba4a5 --- /dev/null +++ b/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/VMBridge.java @@ -0,0 +1,183 @@ +/* -*- 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) 1997-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * 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 ***** */ + +// API class + +package org.mozilla.javascript; + +import java.lang.reflect.Method; +import java.lang.reflect.Member; +import java.util.Iterator; + +public abstract class VMBridge +{ + + static final VMBridge instance = makeInstance(); + + private static VMBridge makeInstance() + { + String[] classNames = { + "org.mozilla.javascript.VMBridge_custom", + "org.mozilla.javascript.jdk15.VMBridge_jdk15", + "org.mozilla.javascript.jdk13.VMBridge_jdk13", + "org.mozilla.javascript.jdk11.VMBridge_jdk11", + }; + for (int i = 0; i != classNames.length; ++i) { + String className = classNames[i]; + Class cl = Kit.classOrNull(className); + if (cl != null) { + VMBridge bridge = (VMBridge)Kit.newInstanceOrNull(cl); + if (bridge != null) { + return bridge; + } + } + } + throw new IllegalStateException("Failed to create VMBridge instance"); + } + + /** + * Return a helper object to optimize {@link Context} access. + * <p> + * The runtime will pass the resulting helper object to the subsequent + * calls to {@link #getContext(Object contextHelper)} and + * {@link #setContext(Object contextHelper, Context cx)} methods. + * In this way the implementation can use the helper to cache + * information about current thread to make {@link Context} access faster. + */ + protected abstract Object getThreadContextHelper(); + + /** + * Get {@link Context} instance associated with the current thread + * or null if none. + * + * @param contextHelper The result of {@link #getThreadContextHelper()} + * called from the current thread. + */ + protected abstract Context getContext(Object contextHelper); + + /** + * Associate {@link Context} instance with the current thread or remove + * the current association if <tt>cx</tt> is null. + * + * @param contextHelper The result of {@link #getThreadContextHelper()} + * called from the current thread. + */ + protected abstract void setContext(Object contextHelper, Context cx); + + /** + * Return the ClassLoader instance associated with the current thread. + */ + protected abstract ClassLoader getCurrentThreadClassLoader(); + + /** + * In many JVMSs, public methods in private + * classes are not accessible by default (Sun Bug #4071593). + * VMBridge instance should try to workaround that via, for example, + * calling method.setAccessible(true) when it is available. + * The implementation is responsible to catch all possible exceptions + * like SecurityException if the workaround is not available. + * + * @return true if it was possible to make method accessible + * or false otherwise. + */ + protected abstract boolean tryToMakeAccessible(Object accessibleObject); + + /** + * Create helper object to create later proxies implementing the specified + * interfaces later. Under JDK 1.3 the implementation can look like: + * <pre> + * return java.lang.reflect.Proxy.getProxyClass(..., interfaces). + * getConstructor(new Class[] { + * java.lang.reflect.InvocationHandler.class }); + * </pre> + * + * @param interfaces Array with one or more interface class objects. + */ + protected Object getInterfaceProxyHelper(ContextFactory cf, + Class[] interfaces) + { + throw Context.reportRuntimeError( + "VMBridge.getInterfaceProxyHelper is not supported"); + } + + /** + * Create proxy object for {@link InterfaceAdapter}. The proxy should call + * {@link InterfaceAdapter#invoke(ContextFactory cf, + * Object target, + * Scriptable topScope, + * Method method, + * Object[] args)} + * as implementation of interface methods associated with + * <tt>proxyHelper</tt>. + * + * @param proxyHelper The result of the previous call to + * {@link #getInterfaceProxyHelper(ContextFactory, Class[])}. + */ + protected Object newInterfaceProxy(Object proxyHelper, + ContextFactory cf, + InterfaceAdapter adapter, + Object target, + Scriptable topScope) + { + throw Context.reportRuntimeError( + "VMBridge.newInterfaceProxy is not supported"); + } + + /** + * Returns whether or not a given member (method or constructor) + * has variable arguments. + * Variable argument methods have only been supported in Java since + * JDK 1.5. + */ + protected abstract boolean isVarArgs(Member member); + + /** + * If "obj" is a java.util.Iterator or a java.lang.Iterable, return a + * wrapping as a JavaScript Iterator. Otherwise, return null. + * This method is in VMBridge since Iterable is a JDK 1.5 addition. + */ + public Iterator getJavaIterator(Context cx, Scriptable scope, Object obj) { + if (obj instanceof Wrapper) { + Object unwrapped = ((Wrapper) obj).unwrap(); + Iterator iterator = null; + if (unwrapped instanceof Iterator) + iterator = (Iterator) unwrapped; + return iterator; + } + return null; + } +} |