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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 2013 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.spdy;

import org.jboss.netty.util.internal.StringUtil;

/**
 * The default {@link SpdySynStreamFrame} implementation.
 */
public class DefaultSpdySynStreamFrame extends DefaultSpdyHeadersFrame
        implements SpdySynStreamFrame {

    private int associatedToStreamId;
    private byte priority;
    private boolean unidirectional;

    /**
     * Creates a new instance.
     *
     * @param streamId             the Stream-ID of this frame
     * @param associatedToStreamId the Associated-To-Stream-ID of this frame
     * @param priority             the priority of the stream
     */
    public DefaultSpdySynStreamFrame(
            int streamId, int associatedToStreamId, byte priority) {
        super(streamId);
        setAssociatedToStreamId(associatedToStreamId);
        setPriority(priority);
    }

    public int getAssociatedToStreamId() {
        return associatedToStreamId;
    }

    public void setAssociatedToStreamId(int associatedToStreamId) {
        if (associatedToStreamId < 0) {
            throw new IllegalArgumentException(
                    "Associated-To-Stream-ID cannot be negative: " +
                    associatedToStreamId);
        }
        this.associatedToStreamId = associatedToStreamId;
    }

    public byte getPriority() {
        return priority;
    }

    public void setPriority(byte priority) {
        if (priority < 0 || priority > 7) {
            throw new IllegalArgumentException(
                    "Priority must be between 0 and 7 inclusive: " + priority);
        }
        this.priority = priority;
    }

    public boolean isUnidirectional() {
        return unidirectional;
    }

    public void setUnidirectional(boolean unidirectional) {
        this.unidirectional = unidirectional;
    }

    @Override
    public String toString() {
        StringBuilder buf = new StringBuilder();
        buf.append(getClass().getSimpleName());
        buf.append("(last: ");
        buf.append(isLast());
        buf.append("; unidirectional: ");
        buf.append(isUnidirectional());
        buf.append(')');
        buf.append(StringUtil.NEWLINE);
        buf.append("--> Stream-ID = ");
        buf.append(getStreamId());
        buf.append(StringUtil.NEWLINE);
        if (associatedToStreamId != 0) {
            buf.append("--> Associated-To-Stream-ID = ");
            buf.append(getAssociatedToStreamId());
            buf.append(StringUtil.NEWLINE);
        }
        buf.append("--> Priority = ");
        buf.append(getPriority());
        buf.append(StringUtil.NEWLINE);
        buf.append("--> Headers:");
        buf.append(StringUtil.NEWLINE);
        appendHeaders(buf);

        // Remove the last newline.
        buf.setLength(buf.length() - StringUtil.NEWLINE.length());
        return buf.toString();
    }
}