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