Initial revision

From-SVN: r26263

libjava/java/io/PipedOutputStream.java

@@ -0,0 +1,94 @@
+// PipedOutputStream.java - Write bytes to a pipe.
+
+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package java.io;
+
+/**
+ * @author Tom Tromey <tromey@cygnus.com>
+ * @date September 24, 1998 
+ */
+
+/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
+ * "The Java Language Specification", ISBN 0-201-63451-1
+ * Status:  Believed complete and correct.
+ */
+
+public class PipedOutputStream extends OutputStream
+{
+  public void close () throws IOException
+  {
+    closed = true;
+
+    // Notify PipedInputStream that there is no more data to be had.
+    destination.receive(-1);
+  }
+
+  public void connect (PipedInputStream dest) throws IOException
+  {
+    if (closed)
+      throw new IOException("pipe closed");
+
+    if (destination != null)
+      if (destination == dest)
+	return;
+      else
+        throw new IOException("pipe already connected");
+
+    destination = dest;
+    try
+    {
+      dest.connect(this);
+    }
+    catch (IOException ex)
+    {
+      destination = null;
+      throw ex;
+    }
+  }
+
+  public synchronized void flush () throws IOException
+  {
+    // There doesn't seem to be anything to do here.
+
+    // TBD: Should this maybe do a notifyAll as a way for the user
+    // to wake up the input stream to check for bytes to read?  Shouldn't
+    // be necessary but if there aren't any bytes, other threads will just
+    // go blocak again anyway so it wouldn't hurt.
+  }
+
+  public PipedOutputStream ()
+  {
+    closed = false;
+  }
+
+  public PipedOutputStream (PipedInputStream dest) throws IOException
+  {
+    closed = false;
+    connect (dest);
+  }
+
+  public void write (int oneByte) throws IOException
+  {
+    if (closed)
+      throw new IOException ();
+    destination.receive(oneByte);
+  }
+
+  // This is mentioned in the JCL book, but we don't really need it.
+  // If there were a corresponding receive() method on
+  // PipedInputStream then we could get better performance using
+  // this.
+  // public void write (byte[] buffer, int offset, int count)
+  // throws IOException;
+
+  // Instance variables.
+  private PipedInputStream destination;
+  private boolean closed;
+}