Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /** |
| 2 | * $RCSfile$ |
| 3 | * $Revision$ |
| 4 | * $Date$ |
| 5 | * |
| 6 | * Copyright 2003-2007 Jive Software. |
| 7 | * |
| 8 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | */ |
| 20 | |
| 21 | package org.jivesoftware.smack.util; |
| 22 | |
| 23 | import java.io.*; |
| 24 | import java.util.*; |
| 25 | |
| 26 | /** |
| 27 | * An ObservableWriter is a wrapper on a Writer that notifies to its listeners when |
| 28 | * writing to character streams. |
| 29 | * |
| 30 | * @author Gaston Dombiak |
| 31 | */ |
| 32 | public class ObservableWriter extends Writer { |
| 33 | |
| 34 | Writer wrappedWriter = null; |
| 35 | List<WriterListener> listeners = new ArrayList<WriterListener>(); |
| 36 | |
| 37 | public ObservableWriter(Writer wrappedWriter) { |
| 38 | this.wrappedWriter = wrappedWriter; |
| 39 | } |
| 40 | |
| 41 | public void write(char cbuf[], int off, int len) throws IOException { |
| 42 | wrappedWriter.write(cbuf, off, len); |
| 43 | String str = new String(cbuf, off, len); |
| 44 | notifyListeners(str); |
| 45 | } |
| 46 | |
| 47 | public void flush() throws IOException { |
| 48 | wrappedWriter.flush(); |
| 49 | } |
| 50 | |
| 51 | public void close() throws IOException { |
| 52 | wrappedWriter.close(); |
| 53 | } |
| 54 | |
| 55 | public void write(int c) throws IOException { |
| 56 | wrappedWriter.write(c); |
| 57 | } |
| 58 | |
| 59 | public void write(char cbuf[]) throws IOException { |
| 60 | wrappedWriter.write(cbuf); |
| 61 | String str = new String(cbuf); |
| 62 | notifyListeners(str); |
| 63 | } |
| 64 | |
| 65 | public void write(String str) throws IOException { |
| 66 | wrappedWriter.write(str); |
| 67 | notifyListeners(str); |
| 68 | } |
| 69 | |
| 70 | public void write(String str, int off, int len) throws IOException { |
| 71 | wrappedWriter.write(str, off, len); |
| 72 | str = str.substring(off, off + len); |
| 73 | notifyListeners(str); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Notify that a new string has been written. |
| 78 | * |
| 79 | * @param str the written String to notify |
| 80 | */ |
| 81 | private void notifyListeners(String str) { |
| 82 | WriterListener[] writerListeners = null; |
| 83 | synchronized (listeners) { |
| 84 | writerListeners = new WriterListener[listeners.size()]; |
| 85 | listeners.toArray(writerListeners); |
| 86 | } |
| 87 | for (int i = 0; i < writerListeners.length; i++) { |
| 88 | writerListeners[i].write(str); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Adds a writer listener to this writer that will be notified when |
| 94 | * new strings are sent. |
| 95 | * |
| 96 | * @param writerListener a writer listener. |
| 97 | */ |
| 98 | public void addWriterListener(WriterListener writerListener) { |
| 99 | if (writerListener == null) { |
| 100 | return; |
| 101 | } |
| 102 | synchronized (listeners) { |
| 103 | if (!listeners.contains(writerListener)) { |
| 104 | listeners.add(writerListener); |
| 105 | } |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Removes a writer listener from this writer. |
| 111 | * |
| 112 | * @param writerListener a writer listener. |
| 113 | */ |
| 114 | public void removeWriterListener(WriterListener writerListener) { |
| 115 | synchronized (listeners) { |
| 116 | listeners.remove(writerListener); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | } |