--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/nio/channels/Pipe.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,153 @@
+/*
+ * Copyright 2000-2001 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.nio.channels;
+
+import java.io.IOException;
+import java.nio.channels.spi.*;
+
+
+/**
+ * A pair of channels that implements a unidirectional pipe.
+ *
+ * <p> A pipe consists of a pair of channels: A writable {@link
+ * Pipe.SinkChannel </code>sink<code>} channel and a readable {@link
+ * Pipe.SourceChannel </code>source<code>} channel.  Once some bytes are
+ * written to the sink channel they can be read from source channel in exactly
+ * the order in which they were written.
+ *
+ * <p> Whether or not a thread writing bytes to a pipe will block until another
+ * thread reads those bytes, or some previously-written bytes, from the pipe is
+ * system-dependent and therefore unspecified.  Many pipe implementations will
+ * buffer up to a certain number of bytes between the sink and source channels,
+ * but such buffering should not be assumed.  </p>
+ *
+ *
+ * @author Mark Reinhold
+ * @author JSR-51 Expert Group
+ * @since 1.4
+ */
+
+public abstract class Pipe {
+
+    /**
+     * A channel representing the readable end of a {@link Pipe}.  </p>
+     *
+     * @since 1.4
+     */
+    public static abstract class SourceChannel
+        extends AbstractSelectableChannel
+        implements ReadableByteChannel, ScatteringByteChannel
+    {
+        /**
+         * Constructs a new instance of this class.
+         */
+        protected SourceChannel(SelectorProvider provider) {
+            super(provider);
+        }
+
+        /**
+         * Returns an operation set identifying this channel's supported
+         * operations.
+         *
+         * <p> Pipe-source channels only support reading, so this method
+         * returns {@link SelectionKey#OP_READ}.  </p>
+         *
+         * @return  The valid-operation set
+         */
+        public final int validOps() {
+            return SelectionKey.OP_READ;
+        }
+
+    }
+
+    /**
+     * A channel representing the writable end of a {@link Pipe}.  </p>
+     *
+     * @since 1.4
+     */
+    public static abstract class SinkChannel
+        extends AbstractSelectableChannel
+        implements WritableByteChannel, GatheringByteChannel
+    {
+        /**
+         * Initializes a new instance of this class.
+         */
+        protected SinkChannel(SelectorProvider provider) {
+            super(provider);
+        }
+
+        /**
+         * Returns an operation set identifying this channel's supported
+         * operations.
+         *
+         * <p> Pipe-sink channels only support writing, so this method returns
+         * {@link SelectionKey#OP_WRITE}.  </p>
+         *
+         * @return  The valid-operation set
+         */
+        public final int validOps() {
+            return SelectionKey.OP_WRITE;
+        }
+
+    }
+
+    /**
+     * Initializes a new instance of this class.
+     */
+    protected Pipe() { }
+
+    /**
+     * Returns this pipe's source channel.  </p>
+     *
+     * @return  This pipe's source channel
+     */
+    public abstract SourceChannel source();
+
+    /**
+     * Returns this pipe's sink channel.  </p>
+     *
+     * @return  This pipe's sink channel
+     */
+    public abstract SinkChannel sink();
+
+    /**
+     * Opens a pipe.
+     *
+     * <p> The new pipe is created by invoking the {@link
+     * java.nio.channels.spi.SelectorProvider#openPipe openPipe} method of the
+     * system-wide default {@link java.nio.channels.spi.SelectorProvider}
+     * object.  </p>
+     *
+     * @return  A new pipe
+     *
+     * @throws  IOException
+     *          If an I/O error occurs
+     */
+    public static Pipe open() throws IOException {
+        return SelectorProvider.provider().openPipe();
+    }
+
+}