jjg@1210: /*
jjg@1210:  * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
jjg@1210:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@1210:  *
jjg@1210:  * This code is free software; you can redistribute it and/or modify it
jjg@1210:  * under the terms of the GNU General Public License version 2 only, as
jjg@1210:  * published by the Free Software Foundation.  Oracle designates this
jjg@1210:  * particular file as subject to the "Classpath" exception as provided
jjg@1210:  * by Oracle in the LICENSE file that accompanied this code.
jjg@1210:  *
jjg@1210:  * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@1210:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@1210:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jjg@1210:  * version 2 for more details (a copy is included in the LICENSE file that
jjg@1210:  * accompanied this code).
jjg@1210:  *
jjg@1210:  * You should have received a copy of the GNU General Public License version
jjg@1210:  * 2 along with this work; if not, write to the Free Software Foundation,
jjg@1210:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@1210:  *
jjg@1210:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jjg@1210:  * or visit www.oracle.com if you need additional information or have any
jjg@1210:  * questions.
jjg@1210:  */
jjg@1210: 
jjg@1210: package com.sun.tools.javac.api;
jjg@1210: 
jjg@1210: import java.util.Arrays;
jjg@1210: import java.util.Collection;
jjg@1210: 
jjg@1210: import com.sun.source.util.TaskEvent;
jjg@1210: import com.sun.source.util.TaskListener;
jjg@1210: import com.sun.tools.javac.util.Context;
jjg@1210: 
jjg@1210: /**
jjg@1210:  * TODO.
jjg@1210:  *
jjg@1210:  * <p><b>This is NOT part of any supported API.
jjg@1210:  * If you write code that depends on this, you do so at your own risk.
jjg@1210:  * This code and its internal interfaces are subject to change or
jjg@1210:  * deletion without notice.</b>
jjg@1210:  */
jjg@1210: public class MultiTaskListener implements TaskListener {
jjg@1210:     /** The context key for the MultiTaskListener. */
jjg@1210:     public static final Context.Key<MultiTaskListener> taskListenerKey =
jjg@1210:         new Context.Key<MultiTaskListener>();
jjg@1210: 
jjg@1210:     /** Get the MultiTaskListener instance for this context. */
jjg@1210:     public static MultiTaskListener instance(Context context) {
jjg@1210:         MultiTaskListener instance = context.get(taskListenerKey);
jjg@1210:         if (instance == null)
jjg@1210:             instance = new MultiTaskListener(context);
jjg@1210:         return instance;
jjg@1210:     }
jjg@1210: 
jjg@1210:     protected MultiTaskListener(Context context) {
jjg@1210:         context.put(taskListenerKey, this);
jjg@1210:         ccw = ClientCodeWrapper.instance(context);
jjg@1210:     }
jjg@1210: 
jjg@1210:     /**
jjg@1210:      * The current set of registered listeners.
jjg@1210:      * This is a mutable reference to an immutable array.
jjg@1210:      */
jjg@1210:     TaskListener[] listeners = { };
jjg@1210: 
jjg@1210:     ClientCodeWrapper ccw;
jjg@1210: 
jjg@1210:     public Collection<TaskListener> getTaskListeners() {
jjg@1210:         return Arrays.asList(listeners);
jjg@1210:     }
jjg@1210: 
jjg@1210:     public boolean isEmpty() {
jjg@1210:         return (listeners.length == 0);
jjg@1210:     }
jjg@1210: 
jjg@1210:     public void add(TaskListener listener) {
jjg@1210:         for (TaskListener l: listeners) {
jjg@1210:             if (ccw.unwrap(l) == listener)
jjg@1210:                 throw new IllegalStateException();
jjg@1210:         }
jjg@1339:         listeners = Arrays.copyOf(listeners, listeners.length + 1);
jjg@1339:         listeners[listeners.length - 1] = ccw.wrap(listener);
jjg@1210:     }
jjg@1210: 
jjg@1210:     public void remove(TaskListener listener) {
jjg@1210:         for (int i = 0; i < listeners.length; i++) {
jjg@1210:             if (ccw.unwrap(listeners[i]) == listener) {
jjg@1210:                 TaskListener[] newListeners = new TaskListener[listeners.length - 1];
jjg@1210:                 System.arraycopy(listeners, 0, newListeners, 0, i);
jjg@1210:                 System.arraycopy(listeners, i + 1, newListeners, i, newListeners.length - i);
jjg@1210:                 listeners = newListeners;
jjg@1210:                 break;
jjg@1210:             }
jjg@1210:         }
jjg@1210:     }
jjg@1210: 
jjg@1210:     @Override
jjg@1210:     public void started(TaskEvent e) {
jjg@1210:         // guard against listeners being updated by a listener
jjg@1210:         TaskListener[] ll = this.listeners;
jjg@1210:         for (TaskListener l: ll)
jjg@1210:             l.started(e);
jjg@1210:     }
jjg@1210: 
jjg@1210:     @Override
jjg@1210:     public void finished(TaskEvent e) {
jjg@1210:         // guard against listeners being updated by a listener
jjg@1210:         TaskListener[] ll = this.listeners;
jjg@1210:         for (TaskListener l: ll)
jjg@1210:             l.finished(e);
jjg@1210:     }
jjg@1210: 
jjg@1210:     @Override
jjg@1210:     public String toString() {
jjg@1210:         return Arrays.toString(listeners);
jjg@1210:     }
jjg@1210: }