/*
 * Copyright (c) 2005, 2017, 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.net.httpserver;

import java.io.IOException;
import java.io.InputStream;

/**
 * A class which allows the caller to read the underlying stream for an upgrade request.
 * close() does not close the underlying stream
 */
class UpgradeInputStream extends LeftOverInputStream {

    UpgradeInputStream(ExchangeImpl t, InputStream src) {
        super(t, src);
    }

    @Override
    protected int readImpl(byte[] b, int off, int len) throws IOException {
        if (!t.upgraded) {
            return -1;
        }
        return in.read(b, off, len);
    }

    @Override
    public int available() throws IOException {
        if (!t.upgraded) {
            return 0;
        }
        return in.available();
    }

    @Override
    public void reset() throws IOException {
        throw new IOException("mark/reset not supported");
    }

    @Override
    public void close() throws IOException {
        closed = true;
        if(t.getConnection().state == State.REQUEST) {
          t.getServerImpl().requestCompleted(t.getConnection());
        }
    }

    @Override
    public byte[] readAllBytes() throws IOException {
        if (!t.upgraded) {
          return new byte[0];
        }
        throw new IOException("readAllBytes not supported for upgraded requests");
    }
}