Merge devel code into the trunk.

[tinyos-2.x.git] / support / sdk / java / net / tinyos / packet / StreamByteSource.java

diff --git a/support/sdk/java/net/tinyos/packet/StreamByteSource.java b/support/sdk/java/net/tinyos/packet/StreamByteSource.java
new file mode 100644 (file)
index 0000000..d06bfbe
--- /dev/null
+++ b/support/sdk/java/net/tinyos/packet/StreamByteSource.java
@@ -0,0 +1,101 @@
+// $Id$
+
+/*                                                                     tab:4
+ * "Copyright (c) 2000-2003 The Regents of the University  of California.  
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
+ * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
+ *
+ * Copyright (c) 2002-2003 Intel Corporation
+ * All rights reserved.
+ *
+ * This file is distributed under the terms in the attached INTEL-LICENSE     
+ * file. If you do not find these files, copies can be found by writing to
+ * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
+ * 94704.  Attention:  Intel License Inquiry.
+ */
+
+
+package net.tinyos.packet;
+
+import java.util.*;
+import java.io.*;
+
+abstract public class StreamByteSource implements ByteSource
+{
+    protected InputStream is;
+    protected OutputStream os;
+    private boolean opened;
+
+    protected StreamByteSource() {
+    }
+
+    abstract protected void openStreams() throws IOException;
+    abstract protected void closeStreams() throws IOException;
+
+    public void open() throws IOException {
+       openStreams();
+       opened = true;
+    }
+
+    public void close() {
+       if (opened) {
+           opened = false;
+           try { 
+               os.close(); 
+               is.close();
+               closeStreams();
+           }
+           catch (Exception e) { }
+       }
+    }
+
+    public byte readByte() throws IOException {
+       int serialByte;
+
+       if (!opened)
+           throw new IOException("not open");
+
+       try {
+           serialByte = is.read();
+       }
+       catch (IOException e) {
+           serialByte = -1;
+       }
+
+       if (serialByte == -1) {
+           close();
+           throw new IOException("read error");
+       }
+
+       return (byte)serialByte;
+    }
+
+    public void writeBytes(byte[] bytes) throws IOException {
+       if (!opened)
+           throw new IOException("not open");
+
+       try {
+           os.write(bytes);
+           os.flush();
+       }
+       catch (IOException e) {
+           close();
+           throw new IOException("write error");
+       }
+    }
+}