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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
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package org.glassfish.grizzly.spdy.frames;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.ThreadCache;
import org.glassfish.grizzly.memory.MemoryManager;

import static org.glassfish.grizzly.spdy.Constants.SPDY_VERSION;

public class PingFrame extends SpdyFrame {

    private static final ThreadCache.CachedTypeIndex CACHE_IDX =
                       ThreadCache.obtainIndex(PingFrame.class, 8);

    public static final int TYPE = 6;

    private int pingId;

    // ------------------------------------------------------------ Constructors


    private PingFrame() { }


    // ---------------------------------------------------------- Public Methods


    static PingFrame create() {
        PingFrame frame = ThreadCache.takeFromCache(CACHE_IDX);
        if (frame == null) {
            frame = new PingFrame();
        }
        return frame;
    }

    static PingFrame create(final SpdyHeader header) {
        PingFrame frame = create();
        frame.initialize(header);
        return frame;
    }

    public static PingFrameBuilder builder() {
        return new PingFrameBuilder();
    }

    public int getPingId() {
        return pingId;
    }

    @Override
    public boolean isFlagSet(byte flag) {
        return false;
    }

    @Override
    public void setFlag(byte flag) {
        // no-op
    }

    @Override
    public void clearFlag(byte flag) {
        // no-op
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append("PingFrame");
        sb.append("{pingId=").append(pingId);
        sb.append('}');
        return sb.toString();
    }

    // -------------------------------------------------- Methods from Cacheable


    @Override
    public void recycle() {
        pingId = 0;
        super.recycle();
        ThreadCache.putToCache(CACHE_IDX, this);
    }


    // -------------------------------------------------- Methods from SpdyFrame


    @Override
    public Buffer toBuffer(final MemoryManager memoryManager) {
        final Buffer frameBuffer = memoryManager.allocate(12);
        frameBuffer.putInt(0x80000000 | (SPDY_VERSION << 16) | TYPE); // "C", version, PING_FRAME
        frameBuffer.putInt(4); // Flags, Length
        frameBuffer.putInt(pingId); // Ping-ID
        frameBuffer.trim();
        return frameBuffer;
    }


    // ------------------------------------------------------- Protected Methods

    @Override
    protected void initialize(SpdyHeader header) {
        super.initialize(header);
        pingId = header.buffer.getInt();
    }


    // ---------------------------------------------------------- Nested Classes


    public static class PingFrameBuilder extends SpdyFrameBuilder {

        private final PingFrame pingFrame;


        // -------------------------------------------------------- Constructors


        protected PingFrameBuilder() {
            super(PingFrame.create());
            pingFrame = (PingFrame) frame;
        }


        // ------------------------------------------------------ Public Methods


        public PingFrameBuilder pingId(final int pingId) {
            pingFrame.pingId = pingId;
            return this;
        }

        public PingFrame build() {
            return pingFrame;
        }


        // --------------------------------------- Methods from SpdyFrameBuilder


        @Override
        protected PingFrameBuilder getThis() {
            return this;
        }

    } // END PingFrameBuilder

}