Initial check-in

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2215 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smack/util/ObservableReader.java

@@ -0,0 +1,150 @@
+/**
+* $RCSfile$
+* $Revision$
+* $Date$
+*
+* Copyright (C) 2002-2003 Jive Software. All rights reserved.
+* ====================================================================
+* The Jive Software License (based on Apache Software License, Version 1.1)
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+* 1. Redistributions of source code must retain the above copyright
+*    notice, this list of conditions and the following disclaimer.
+*
+* 2. Redistributions in binary form must reproduce the above copyright
+*    notice, this list of conditions and the following disclaimer in
+*    the documentation and/or other materials provided with the
+*    distribution.
+*
+* 3. The end-user documentation included with the redistribution,
+*    if any, must include the following acknowledgment:
+*       "This product includes software developed by
+*        Jive Software (http://www.jivesoftware.com)."
+*    Alternately, this acknowledgment may appear in the software itself,
+*    if and wherever such third-party acknowledgments normally appear.
+*
+* 4. The names "Smack" and "Jive Software" must not be used to
+*    endorse or promote products derived from this software without
+*    prior written permission. For written permission, please
+*    contact webmaster@jivesoftware.com.
+*
+* 5. Products derived from this software may not be called "Smack",
+*    nor may "Smack" appear in their name, without prior written
+*    permission of Jive Software.
+*
+* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+* DISCLAIMED.  IN NO EVENT SHALL JIVE SOFTWARE OR
+* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+* SUCH DAMAGE.
+* ====================================================================
+*/
+
+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 listeners = new ArrayList();
+
+    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);
+        }
+    }
+
+}