AlreadyConnectedException.java: Removed unneeded import.

2002-11-13  Michael Koch <konqueror@gmx.de>

	* java/nio/channels/AlreadyConnectedException.java:
	Removed unneeded import.
	(AlreadyConnectedException): Documentation added.
	* java/nio/channels/Pipe.java
	(SinkChannel.SinkChannel): Documentation added.
	(SinkChannel.validOps): New method.
	(SourceChannel.SourceChannel): Documentation added.
	(SourceChannel.validOps): New method.
	(Pipe): Documentation added.
	(open): Documentation added.
	(SinkChannel.channel): Documentation added.
	(SourceChannel.channel): Documentation added.
	* java/nio/channel/SelectableChannel.java
	(SelectableChannel): Documentation added.
	(blockingLock): Documentation added.
	(configureBlocking):Documentation added.
	(isBlocking):Documentation added.
	(isRegistered):Documentation added.
	(keyFor):Documentation added.
	(provider):Documentation added.
	(register): Documentation added.
	(validOps): Documentation added.
	* jaba/nio/channels/SelectionKey.java
	(SelectionKey): Documentation added.
	(attach): Documentation added.
	(attachment): Documentation added.
	(isAcceptable): Documentation added.
	(isConnetable): Documentation added.
	(isReadable): Documentation added.
	(isWritable): Documentation added.
	(cancel): Documentation added.
	(channel): Documentation added.
	(interestOps): Documentation added.
	(isValid): Documentation added.
	(readyOps): Documentation added.
	(selector): Documentation added.
	* jaba/nio/channels/Selector.java
	(Selector): Documentation added.
	(open): Documentation added.
	(close): Documentation added.
	(isOpen): Documentation added.
	(keys): Documentation added.
	(provider): Documentation added.
	(select): Documentation added.
	(selectedKeys): Documentation added.
	(selectNow): Documentation added.
	(wakeup): Documentation added.
	* java/nio/channels/spi/AbstractInterruptibleChannel.java
	(AbstractInterruptibleChannel): Documentation added.
	(opened): Default to true;
	(begin): Documentation added.
	(close): Set opened to false, documentation added.
	(isOpen): Documentation added.
	* java/nio/channels/spi/AbstractSelectionKey.java
	(AbstractSelectionKey): Documentation added.
	(cancel): Documentation added.
	(isValid): Documentation added.
	* java/nio/channels/spi/AbstractSelector.java
	(AbstractSelector): Documentation added.
	(begin): Documentation added.
	(close): Documentation added.
	(isOpen): Documentation added.
	(deregister): Documentation added.
	(end): Documentation added.
	(provider): Documentation added.
	(implCloseSelector): Documentation added.
	(register): Documentation added.
	* java/nio/channels/spi/SelectorProvider.java
	(SelectorProvider): Documentation added.
	(openDatagramChannel): Documentation added.
	(openPipe): Documentation added.
	(openSelector): Documentation added.
	(openServerSocketChannel): Documentation added.
	(openSocketChannel): Documentation added.
	(provider): Documentation added.

From-SVN: r59077

libjava/java/nio/channels/Pipe.java

@@ -40,40 +40,82 @@ package java.nio.channels;
 import java.nio.channels.spi.AbstractSelectableChannel;
 import java.nio.channels.spi.SelectorProvider;
 
+/**
+ * @author Michael Koch
+ * @since 1.4
+ */
 public abstract class Pipe
 {
   public abstract static class SinkChannel
     extends AbstractSelectableChannel
     implements WritableByteChannel, GatheringByteChannel
   {
-    protected SinkChannel(SelectorProvider provider)
+    /**
+     * Initializes the channel.
+     */
+    protected SinkChannel (SelectorProvider provider)
     {
       super (provider);
     }
+
+    /**
+     * Returns an operation set that is valid on this channel.
+     *
+     * The only valid operation on this channel is @see SelectionKey.OP_WRITE.
+     */
+    public final int validOps ()
+    {
+      return SelectionKey.OP_WRITE;
+    }
   }
 
   public abstract static class SourceChannel
     extends AbstractSelectableChannel
     implements ReadableByteChannel, ScatteringByteChannel
   {
-    protected SourceChannel(SelectorProvider provider)
+    /**
+     * Initializes the channel.
+     */
+    protected SourceChannel (SelectorProvider provider)
     {
       super (provider);
     }
+
+    /**
+     * Returns an operation set that is valid on this channel.
+     *
+     * The only valid operation on this channel is @see SelectionKey.OP_READ.
+     */
+    public final int validOps ()
+    {
+      return SelectionKey.OP_READ;
+    }
   }
-    
+
+  /**
+   * Initializes the pipe.
+   */
   protected Pipe()
   {
   }
 
   /**
+   * Opens a pipe.
+   * 
    * @exception IOException If an error occurs
    */
   public static Pipe open()
   {
-    return null;
+    return SelectorProvider.provider ().openPipe();
   }
-    
+
+  /**
+   * Returns a pipe's sink channel.
+   */
   public abstract Pipe.SinkChannel sink();
+
+  /**
+   * Returns a pipe's source channel
+   */
   public abstract Pipe.SourceChannel source();   
 }