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 ObservableReader is a wrapper on a Reader that notifies to its listeners when |
| 28 | * reading character streams. |
| 29 | * |
| 30 | * @author Gaston Dombiak |
| 31 | */ |
| 32 | public class ObservableReader extends Reader { |
| 33 | |
| 34 | Reader wrappedReader = null; |
| 35 | List<ReaderListener> listeners = new ArrayList<ReaderListener>(); |
| 36 | |
| 37 | public ObservableReader(Reader wrappedReader) { |
| 38 | this.wrappedReader = wrappedReader; |
| 39 | } |
| 40 | |
| 41 | public int read(char[] cbuf, int off, int len) throws IOException { |
| 42 | int count = wrappedReader.read(cbuf, off, len); |
| 43 | if (count > 0) { |
| 44 | String str = new String(cbuf, off, count); |
| 45 | // Notify that a new string has been read |
| 46 | ReaderListener[] readerListeners = null; |
| 47 | synchronized (listeners) { |
| 48 | readerListeners = new ReaderListener[listeners.size()]; |
| 49 | listeners.toArray(readerListeners); |
| 50 | } |
| 51 | for (int i = 0; i < readerListeners.length; i++) { |
| 52 | readerListeners[i].read(str); |
| 53 | } |
| 54 | } |
| 55 | return count; |
| 56 | } |
| 57 | |
| 58 | public void close() throws IOException { |
| 59 | wrappedReader.close(); |
| 60 | } |
| 61 | |
| 62 | public int read() throws IOException { |
| 63 | return wrappedReader.read(); |
| 64 | } |
| 65 | |
| 66 | public int read(char cbuf[]) throws IOException { |
| 67 | return wrappedReader.read(cbuf); |
| 68 | } |
| 69 | |
| 70 | public long skip(long n) throws IOException { |
| 71 | return wrappedReader.skip(n); |
| 72 | } |
| 73 | |
| 74 | public boolean ready() throws IOException { |
| 75 | return wrappedReader.ready(); |
| 76 | } |
| 77 | |
| 78 | public boolean markSupported() { |
| 79 | return wrappedReader.markSupported(); |
| 80 | } |
| 81 | |
| 82 | public void mark(int readAheadLimit) throws IOException { |
| 83 | wrappedReader.mark(readAheadLimit); |
| 84 | } |
| 85 | |
| 86 | public void reset() throws IOException { |
| 87 | wrappedReader.reset(); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Adds a reader listener to this reader that will be notified when |
| 92 | * new strings are read. |
| 93 | * |
| 94 | * @param readerListener a reader listener. |
| 95 | */ |
| 96 | public void addReaderListener(ReaderListener readerListener) { |
| 97 | if (readerListener == null) { |
| 98 | return; |
| 99 | } |
| 100 | synchronized (listeners) { |
| 101 | if (!listeners.contains(readerListener)) { |
| 102 | listeners.add(readerListener); |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Removes a reader listener from this reader. |
| 109 | * |
| 110 | * @param readerListener a reader listener. |
| 111 | */ |
| 112 | public void removeReaderListener(ReaderListener readerListener) { |
| 113 | synchronized (listeners) { |
| 114 | listeners.remove(readerListener); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | } |