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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+package com.sun.star.lib.uno.bridges.java_remote;
+
+import com.sun.star.bridge.XBridge;
+import com.sun.star.lib.util.AsynchronousFinalizer;
+import com.sun.star.uno.IQueryInterface;
+import com.sun.star.uno.Type;
+import com.sun.star.uno.UnoRuntime;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+
+/**
+ * A factory for proxies specific to the <code>java_remote_bridge</code>.
+ *
+ * <p>Eventually, this class should be united with all other proxy classes
+ * specific to certain bridges (for example, the JNI bridge), resulting in a
+ * generic proxy class.</p>
+ */
+final class ProxyFactory {
+ public ProxyFactory(RequestHandler requestHandler, XBridge bridge) {
+ this.requestHandler = requestHandler;
+ this.bridge = bridge;
+ }
+
+ public Object create(String oid, Type type) {
+ return Proxy.newProxyInstance(
+ getClass().getClassLoader(),
+ new Class[] { com.sun.star.lib.uno.Proxy.class,
+ IQueryInterface.class, type.getZClass() },
+ new Handler(oid, type));
+ }
+
+ public boolean isProxy(Object obj) {
+ if (Proxy.isProxyClass(obj.getClass())) {
+ InvocationHandler h = Proxy.getInvocationHandler(obj);
+ return h instanceof Handler && ((Handler) h).matches(this);
+ } else {
+ return false;
+ }
+ }
+
+ public static XBridge getBridge(Object obj) {
+ if (Proxy.isProxyClass(obj.getClass())) {
+ InvocationHandler h = Proxy.getInvocationHandler(obj);
+ if (h instanceof Handler) {
+ return ((Handler) h).getBridge();
+ }
+ }
+ return null;
+ }
+
+ static int getDebugCount() {
+ synchronized (debugCountLock) {
+ return debugCount;
+ }
+ }
+
+ private static void incrementDebugCount() {
+ synchronized (debugCountLock) {
+ ++debugCount;
+ }
+ }
+
+ private static void decrementDebugCount() {
+ synchronized (debugCountLock) {
+ --debugCount;
+ }
+ }
+
+ private final class Handler implements InvocationHandler {
+ public Handler(String oid, Type type) {
+ this.oid = oid;
+ this.type = type;
+ incrementDebugCount();
+ }
+
+ public boolean matches(ProxyFactory factory) {
+ return ProxyFactory.this == factory;
+ }
+
+ public XBridge getBridge() {
+ return bridge;
+ }
+
+ public Object invoke(Object proxy, Method method, Object[] args)
+ throws Throwable
+ {
+ if (method.equals(METHOD_EQUALS) || method.equals(METHOD_IS_SAME)) {
+ return new Boolean(
+ args[0] != null
+ && oid.equals(UnoRuntime.generateOid(args[0])));
+ } else if (method.equals(METHOD_HASH_CODE)) {
+ return new Integer(oid.hashCode());
+ } else if (method.equals(METHOD_TO_STRING)) {
+ return "[Proxy:" + System.identityHashCode(proxy) + "," + oid
+ + "," + type + "]";
+ } else if (method.equals(METHOD_QUERY_INTERFACE)) {
+ // See the comment in java_remote_bridge.mapInterfaceTo for one
+ // reason why this implementation must not satisfy a request for
+ // a super-interface with a proxy itself:
+ return args[0].equals(type) ? proxy
+ : request("queryInterface", args);
+ } else if (method.equals(METHOD_GET_OID)) {
+ return oid;
+ } else {
+ return request(method.getName(), args);
+ }
+ }
+
+ protected void finalize() {
+ AsynchronousFinalizer.add(new AsynchronousFinalizer.Job() {
+ public void run() throws Throwable {
+ try {
+ request("release", null);
+ } finally {
+ decrementDebugCount();
+ }
+ }
+ });
+ }
+
+ private Object request(String operation, Object[] args) throws Throwable
+ {
+ Object res = requestHandler.sendRequest(oid, type, operation, args);
+ // Avoid early finalization of this object, while an invoke ->
+ // request call is still ongoing; as finalize also calls request,
+ // this should fulfil the condition from The Java Language
+ // Specification, 3rd ed., that "if an object's finalizer can result
+ // in synchronization on that object, then that object must be alive
+ // and considered reachable whenever a lock is held on it:"
+ synchronized (this) {
+ ++dummy;
+ }
+ return res;
+ }
+
+ private final String oid;
+ private final Type type;
+ private int dummy = 0;
+ }
+
+ private static final Method METHOD_EQUALS;
+ private static final Method METHOD_HASH_CODE;
+ private static final Method METHOD_TO_STRING;
+ private static final Method METHOD_QUERY_INTERFACE;
+ private static final Method METHOD_IS_SAME;
+ private static final Method METHOD_GET_OID;
+ static {
+ try {
+ METHOD_EQUALS = Object.class.getMethod(
+ "equals", new Class[] { Object.class });
+ METHOD_HASH_CODE = Object.class.getMethod("hashCode", null);
+ METHOD_TO_STRING = Object.class.getMethod("toString", null);
+ METHOD_QUERY_INTERFACE = IQueryInterface.class.getMethod(
+ "queryInterface", new Class[] { Type.class });
+ METHOD_IS_SAME = IQueryInterface.class.getMethod(
+ "isSame", new Class[] { Object.class });
+ METHOD_GET_OID = IQueryInterface.class.getMethod("getOid", null);
+ } catch (NoSuchMethodException e) {
+ throw new ExceptionInInitializerError(e);
+ }
+ }
+
+ private static final Object debugCountLock = new Object();
+ private static int debugCount = 0;
+
+ private final RequestHandler requestHandler;
+ private final XBridge bridge;
+}