1 files changed, 118 insertions, 0 deletions
diff --git a/src/org/jivesoftware/smack/util/ObservableReader.java b/src/org/jivesoftware/smack/util/ObservableReader.java
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+++ b/src/org/jivesoftware/smack/util/ObservableReader.java
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+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.util;
+
+import java.io.*;
+import java.util.*;
+
+/**
+ * An ObservableReader is a wrapper on a Reader that notifies to its listeners when
+ * reading character streams.
+ * 
+ * @author Gaston Dombiak
+ */
+public class ObservableReader extends Reader {
+
+    Reader wrappedReader = null;
+    List<ReaderListener> listeners = new ArrayList<ReaderListener>();
+
+    public ObservableReader(Reader wrappedReader) {
+        this.wrappedReader = wrappedReader;
+    }
+        
+    public int read(char[] cbuf, int off, int len) throws IOException {
+        int count = wrappedReader.read(cbuf, off, len);
+        if (count > 0) {
+            String str = new String(cbuf, off, count);
+            // Notify that a new string has been read
+            ReaderListener[] readerListeners = null;
+            synchronized (listeners) {
+                readerListeners = new ReaderListener[listeners.size()];
+                listeners.toArray(readerListeners);
+            }
+            for (int i = 0; i < readerListeners.length; i++) {
+                readerListeners[i].read(str);
+            }
+        }
+        return count;
+    }
+
+    public void close() throws IOException {
+        wrappedReader.close();
+    }
+
+    public int read() throws IOException {
+        return wrappedReader.read();
+    }
+
+    public int read(char cbuf[]) throws IOException {
+        return wrappedReader.read(cbuf);
+    }
+
+    public long skip(long n) throws IOException {
+        return wrappedReader.skip(n);
+    }
+
+    public boolean ready() throws IOException {
+        return wrappedReader.ready();
+    }
+
+    public boolean markSupported() {
+        return wrappedReader.markSupported();
+    }
+
+    public void mark(int readAheadLimit) throws IOException {
+        wrappedReader.mark(readAheadLimit);
+    }
+
+    public void reset() throws IOException {
+        wrappedReader.reset();
+    }
+
+    /**
+     * Adds a reader listener to this reader that will be notified when
+     * new strings are read.
+     *
+     * @param readerListener a reader listener.
+     */
+    public void addReaderListener(ReaderListener readerListener) {
+        if (readerListener == null) {
+            return;
+        }
+        synchronized (listeners) {
+            if (!listeners.contains(readerListener)) {
+                listeners.add(readerListener);
+            }
+        }
+    }
+
+    /**
+     * Removes a reader listener from this reader.
+     *
+     * @param readerListener a reader listener.
+     */
+    public void removeReaderListener(ReaderListener readerListener) {
+        synchronized (listeners) {
+            listeners.remove(readerListener);
+        }
+    }
+
+}