jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/api/MultiTaskListener.java@af8417e590f4

     1 /*

     2  * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.tools.javac.api;

    28 import java.util.Arrays;

    29 import java.util.Collection;

    31 import com.sun.source.util.TaskEvent;

    32 import com.sun.source.util.TaskListener;

    33 import com.sun.tools.javac.util.Context;

    35 /**

    36  * TODO.

    37  *

    38  * <p><b>This is NOT part of any supported API.

    39  * If you write code that depends on this, you do so at your own risk.

    40  * This code and its internal interfaces are subject to change or

    41  * deletion without notice.</b>

    42  */

    43 public class MultiTaskListener implements TaskListener {

    44     /** The context key for the MultiTaskListener. */

    45     public static final Context.Key<MultiTaskListener> taskListenerKey =

    46         new Context.Key<MultiTaskListener>();

    48     /** Get the MultiTaskListener instance for this context. */

    49     public static MultiTaskListener instance(Context context) {

    50         MultiTaskListener instance = context.get(taskListenerKey);

    51         if (instance == null)

    52             instance = new MultiTaskListener(context);

    53         return instance;

    54     }

    56     protected MultiTaskListener(Context context) {

    57         context.put(taskListenerKey, this);

    58         ccw = ClientCodeWrapper.instance(context);

    59     }

    61     /**

    62      * The current set of registered listeners.

    63      * This is a mutable reference to an immutable array.

    64      */

    65     TaskListener[] listeners = { };

    67     ClientCodeWrapper ccw;

    69     public Collection<TaskListener> getTaskListeners() {

    70         return Arrays.asList(listeners);

    71     }

    73     public boolean isEmpty() {

    74         return (listeners.length == 0);

    75     }

    77     public void add(TaskListener listener) {

    78         for (TaskListener l: listeners) {

    79             if (ccw.unwrap(l) == listener)

    80                 throw new IllegalStateException();

    81         }

    82         listeners = Arrays.copyOf(listeners, listeners.length + 1);

    83         listeners[listeners.length - 1] = ccw.wrap(listener);

    84     }

    86     public void remove(TaskListener listener) {

    87         for (int i = 0; i < listeners.length; i++) {

    88             if (ccw.unwrap(listeners[i]) == listener) {

    89                 TaskListener[] newListeners = new TaskListener[listeners.length - 1];

    90                 System.arraycopy(listeners, 0, newListeners, 0, i);

    91                 System.arraycopy(listeners, i + 1, newListeners, i, newListeners.length - i);

    92                 listeners = newListeners;

    93                 break;

    94             }

    95         }

    96     }

    98     @Override

    99     public void started(TaskEvent e) {

   100         // guard against listeners being updated by a listener

   101         TaskListener[] ll = this.listeners;

   102         for (TaskListener l: ll)

   103             l.started(e);

   104     }

   106     @Override

   107     public void finished(TaskEvent e) {

   108         // guard against listeners being updated by a listener

   109         TaskListener[] ll = this.listeners;

   110         for (TaskListener l: ll)

   111             l.finished(e);

   112     }

   114     @Override

   115     public String toString() {

   116         return Arrays.toString(listeners);

   117     }

   118 }

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