com.generallycloud.baseio.codec.http2.future.Http2HeadersFrameImpl Maven / Gradle / Ivy

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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * Licensed 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 com.generallycloud.baseio.codec.http2.future;

import java.io.IOException;

import com.generallycloud.baseio.buffer.ByteBuf;
import com.generallycloud.baseio.codec.http2.Http2SocketSession;
import com.generallycloud.baseio.codec.http2.hpack.Decoder;
import com.generallycloud.baseio.component.SocketSession;

public class Http2HeadersFrameImpl extends AbstractHttp2Frame implements Http2HeadersFrame {

	private boolean		isComplete;

	private byte			padLength;

	private boolean		e;

	private int			streamDependency;

	private short			weight;

	private boolean		endStream;

	private static Decoder	decoder	= new Decoder();

	public Http2HeadersFrameImpl(Http2SocketSession session, ByteBuf buf, Http2FrameHeader header) {
		super(session, header);
		this.buf = buf;
	}

	private void doComplete(Http2SocketSession session, ByteBuf buf) throws IOException {

		byte flags = getHeader().getFlags();

		this.endStream = (flags & FLAG_END_STREAM) > 0;

		if ((flags & FLAG_PADDED) > 0) {
			padLength = buf.getByte();
		}

		if ((flags & FLAG_PRIORITY) > 0) {

			streamDependency = buf.getInt();

			e = streamDependency < 0;

			if (e) {
				streamDependency = streamDependency & 0x7FFFFFFF;
			}

			weight = buf.getUnsignedByte();
		}

		decoder.decode(streamDependency, buf, session.getHttp2Headers());
	}

	@Override
	public boolean read(SocketSession session, ByteBuf buffer) throws IOException {

		if (!isComplete) {

			ByteBuf buf = this.buf;

			buf.read(buffer);

			if (buf.hasRemaining()) {
				return false;
			}

			this.isComplete = true;

			doComplete((Http2SocketSession) session, buf.flip());
		}

		return true;
	}

	@Override
	public boolean isSilent() {
		return !endStream;
	}

	@Override
	public Http2FrameType getHttp2FrameType() {
		return Http2FrameType.FRAME_TYPE_HEADERS;
	}

	@Override
	public boolean isE() {
		return e;
	}

	@Override
	public int getStreamDependency() {
		return streamDependency;
	}

	@Override
	public short getWeight() {
		return weight;
	}

	@Override
	public byte getPadLength() {
		return padLength;
	}
	
}