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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.jboss.netty.handler.codec.http.websocketx;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.util.CharsetUtil;

/**
 * Web Socket continuation frame containing continuation text or binary data. This is used for
 * fragmented messages where the contents of a messages is contained more than 1 frame.
 */
public class ContinuationWebSocketFrame extends WebSocketFrame {

    /**
     * Creates a new empty continuation frame.
     */
    public ContinuationWebSocketFrame() {
        setBinaryData(ChannelBuffers.EMPTY_BUFFER);
    }

    /**
     * Creates a new continuation frame with the specified binary data. The final fragment flag is
     * set to true.
     *
     * @param binaryData
     *            the content of the frame.
     */
    public ContinuationWebSocketFrame(ChannelBuffer binaryData) {
        setBinaryData(binaryData);
    }

    /**
     * Creates a new continuation frame with the specified binary data
     *
     * @param finalFragment
     *            flag indicating if this frame is the final fragment
     * @param rsv
     *            reserved bits used for protocol extensions
     * @param binaryData
     *            the content of the frame.
     */
    public ContinuationWebSocketFrame(boolean finalFragment, int rsv, ChannelBuffer binaryData) {
        setFinalFragment(finalFragment);
        setRsv(rsv);
        setBinaryData(binaryData);
    }

    /**
     * Creates a new continuation frame with the specified text data
     *
     * @param finalFragment
     *            flag indicating if this frame is the final fragment
     * @param rsv
     *            reserved bits used for protocol extensions
     * @param text
     *            text content of the frame.
     */
    public ContinuationWebSocketFrame(boolean finalFragment, int rsv, String text) {
        setFinalFragment(finalFragment);
        setRsv(rsv);
        setText(text);
    }

    /**
     * Returns the text data in this frame
     */
    public String getText() {
        if (getBinaryData() == null) {
            return null;
        }
        return getBinaryData().toString(CharsetUtil.UTF_8);
    }

    /**
     * Sets the string for this frame
     *
     * @param text
     *            text to store
     */
    public void setText(String text) {
        if (text == null || text.length() == 0) {
            setBinaryData(ChannelBuffers.EMPTY_BUFFER);
        } else {
            setBinaryData(ChannelBuffers.copiedBuffer(text, CharsetUtil.UTF_8));
        }
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "(data: " + getBinaryData() + ')';
    }
}