/* * Copyright (c) 1996, 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 sun.rmi.transport.proxy; import java.io.*; /** * The HttpSendInputStream class is used by the HttpSendSocket class as * a layer on the top of the InputStream it returns so that it can be * notified of attempts to read from it.  This allows the HttpSendSocket * to know when it should push across its output message. */class HttpSendInputStream extends FilterInputStream {     /** the HttpSendSocket object that is providing this stream */    HttpSendSocket owner;     /**     * Create new filter on a given input stream.     * @param in the InputStream to filter from     * @param owner the HttpSendSocket that is providing this stream     */    public HttpSendInputStream(InputStream in, HttpSendSocket owner)        throws IOException    {        super(in);         this.owner = owner;    }     /**     * Mark this stream as inactive for its owner socket, so the next time     * a read is attempted, the owner will be notified and a new underlying     * input stream obtained.     */    public void deactivate()    {        in = null;    }     /**     * Read a byte of data from the stream.     */    public int read() throws IOException    {        if (in == null)            in = owner.readNotify();        return in.read();    }     /**     * Read into an array of bytes.     * @param b the buffer into which the data is to be read     * @param off the start offset of the data     * @param len the maximum number of bytes to read     */    public int read(byte b[], int off, int len) throws IOException    {        if (len == 0)            return 0;        if (in == null)            in = owner.readNotify();        return in.read(b, off, len);    }     /**     * Skip bytes of input.     * @param n the number of bytes to be skipped     */    public long skip(long n) throws IOException    {        if (n == 0)            return 0;        if (in == null)            in = owner.readNotify();        return in.skip(n);    }     /**     * Return the number of bytes that can be read without blocking.     */    public int available() throws IOException    {        if (in == null)            in = owner.readNotify();        return in.available();    }     /**     * Close the stream.     */    public void close() throws IOException    {        owner.close();    }     /**     * Mark the current position in the stream.     * @param readlimit how many bytes can be read before mark becomes invalid     */    public synchronized void mark(int readlimit)    {        if (in == null) {            try {                in = owner.readNotify();            }            catch (IOException e) {                return;            }        }        in.mark(readlimit);    }     /**     * Reposition the stream to the last marked position.     */    public synchronized void reset() throws IOException    {        if (in == null)            in = owner.readNotify();        in.reset();    }     /**     * Return true if this stream type supports mark/reset.     */    public boolean markSupported()    {        if (in == null) {            try {                in = owner.readNotify();            }            catch (IOException e) {                return false;            }        }        return in.markSupported();    }}