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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014-2016 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:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package org.glassfish.grizzly.http2;

import java.io.IOException;
import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.http2.frames.HeaderBlockHead;
import org.glassfish.grizzly.http2.hpack.Decoder;
import org.glassfish.grizzly.http2.hpack.DecodingCallback;
import org.glassfish.grizzly.memory.Buffers;
import org.glassfish.grizzly.memory.MemoryManager;

/**
 *
 * @author oleksiys
 */
public class HeadersDecoder {
    private final Decoder hpackDecoder;
    private final MemoryManager memoryManager;
    
    private HeaderBlockHead firstHeaderFrame;
    private Buffer inBuffer;

    // @TODO Implement maxHeaderSize limitation handling
    public HeadersDecoder(final MemoryManager memoryManager,
            final int maxHeaderSize, final int maxHeaderTableSize) {
        this.memoryManager = memoryManager;
        this.hpackDecoder =  new Decoder(maxHeaderTableSize);
    }
    
    public void append(final Buffer buffer) {
        inBuffer = Buffers.appendBuffers(memoryManager, inBuffer, buffer, true);
    }
    
    public void decode(final DecodingCallback callback) throws IOException {
        if (inBuffer != null) {
            hpackDecoder.decode(inBuffer, !isProcessingHeaders(), callback);
            
            inBuffer.tryDispose();
            inBuffer = null;
        }
    }

    public HeaderBlockHead finishHeader() {
        final HeaderBlockHead firstHeaderFrameLocal = firstHeaderFrame;
        firstHeaderFrame = null;
        return firstHeaderFrameLocal;
    }

    public void setFirstHeaderFrame(
            final HeaderBlockHead firstHeaderFrame) {
        this.firstHeaderFrame = firstHeaderFrame;
    }

    public boolean isProcessingHeaders() {
        return firstHeaderFrame != null;
    }
}