8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/java/nio/channels/Channel.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2000, 2013, Oracle and/or its affiliates. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.nio.channels;
+
+import java.io.IOException;
+import java.io.Closeable;
+
+
+/**
+ * A nexus for I/O operations.
+ *
+ * <p> A channel represents an open connection to an entity such as a hardware
+ * device, a file, a network socket, or a program component that is capable of
+ * performing one or more distinct I/O operations, for example reading or
+ * writing.
+ *
+ * <p> A channel is either open or closed.  A channel is open upon creation,
+ * and once closed it remains closed.  Once a channel is closed, any attempt to
+ * invoke an I/O operation upon it will cause a {@link ClosedChannelException}
+ * to be thrown.  Whether or not a channel is open may be tested by invoking
+ * its {@link #isOpen isOpen} method.
+ *
+ * <p> Channels are, in general, intended to be safe for multithreaded access
+ * as described in the specifications of the interfaces and classes that extend
+ * and implement this interface.
+ *
+ *
+ * @author Mark Reinhold
+ * @author JSR-51 Expert Group
+ * @since 1.4
+ */
+
+public interface Channel extends Closeable {
+
+    /**
+     * Tells whether or not this channel is open.
+     *
+     * @return {@code true} if, and only if, this channel is open
+     */
+    public boolean isOpen();
+
+    /**
+     * Closes this channel.
+     *
+     * <p> After a channel is closed, any further attempt to invoke I/O
+     * operations upon it will cause a {@link ClosedChannelException} to be
+     * thrown.
+     *
+     * <p> If this channel is already closed then invoking this method has no
+     * effect.
+     *
+     * <p> This method may be invoked at any time.  If some other thread has
+     * already invoked it, however, then another invocation will block until
+     * the first invocation is complete, after which it will return without
+     * effect. </p>
+     *
+     * @throws  IOException  If an I/O error occurs
+     */
+    public void close() throws IOException;
+
+}