/*

 * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

import java.io.*;

import java.nio.*;

import java.nio.charset.*;

/**

 * An object used for sending Content to the requestor.

 *

 * @author Mark Reinhold

 * @author Brad R. Wetmore

 */

class Reply implements Sendable {

    /**

     * A helper class which define the HTTP response codes

     */

    static class Code {

        private int number;

        private String reason;

        private Code(int i, String r) { number = i; reason = r; }

        public String toString() { return number + " " + reason; }

        static Code OK = new Code(200, "OK");

        static Code BAD_REQUEST = new Code(400, "Bad Request");

        static Code NOT_FOUND = new Code(404, "Not Found");

        static Code METHOD_NOT_ALLOWED = new Code(405, "Method Not Allowed");

    }

    private Code code;

    private Content content;

    private boolean headersOnly;

    Reply(Code rc, Content c) {

        this(rc, c, null);

    }

    Reply(Code rc, Content c, Request.Action head) {

        code = rc;

        content = c;

        headersOnly = (head == Request.Action.HEAD);

    }

    private static String CRLF = "\r\n";

    private static Charset ascii = Charset.forName("US-ASCII");

    private ByteBuffer hbb = null;

    private ByteBuffer headers() {

        CharBuffer cb = CharBuffer.allocate(1024);

        for (;;) {

            try {

                cb.put("HTTP/1.0 ").put(code.toString()).put(CRLF);

                cb.put("Server: niossl/0.1").put(CRLF);

                cb.put("Content-type: ").put(content.type()).put(CRLF);

                cb.put("Content-length: ")

                    .put(Long.toString(content.length())).put(CRLF);

                cb.put(CRLF);

                break;

            } catch (BufferOverflowException x) {

                assert(cb.capacity() < (1 << 16));

                cb = CharBuffer.allocate(cb.capacity() * 2);

                continue;

            }

        }

        cb.flip();

        return ascii.encode(cb);

    }

    public void prepare() throws IOException {

        content.prepare();

        hbb = headers();

    }

    public boolean send(ChannelIO cio) throws IOException {

        if (hbb == null)

            throw new IllegalStateException();

        if (hbb.hasRemaining()) {

            if (cio.write(hbb) <= 0)

                return true;

        }

        if (!headersOnly) {

            if (content.send(cio))

                return true;

        }

        if (!cio.dataFlush())

            return true;

        return false;

    }

    public void release() throws IOException {

        content.release();

    }

}