| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.mina.http2.impl; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.mina.http2.api.Http2PriorityFrame.Http2PriorityFrameBuilder; |
| import org.apache.mina.http2.impl.Http2FrameHeadePartialDecoder.Http2FrameHeader; |
| |
| import static org.apache.mina.http2.api.Http2Constants.HTTP2_31BITS_MASK; |
| import static org.apache.mina.http2.api.Http2Constants.HTTP2_EXCLUSIVE_MASK; |
| |
| /** |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class Http2PriorityFrameDecoder extends Http2FrameDecoder { |
| |
| private enum State { |
| STREAM_DEPENDENCY, |
| WEIGHT, |
| EXTRA |
| } |
| |
| private State state; |
| |
| private PartialDecoder<?> decoder; |
| |
| private Http2PriorityFrameBuilder builder = new Http2PriorityFrameBuilder(); |
| |
| public Http2PriorityFrameDecoder(Http2FrameHeader header) { |
| super(header); |
| state = State.STREAM_DEPENDENCY; |
| decoder = new IntPartialDecoder(4); |
| initBuilder(builder); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.mina.http2.api.PartialDecoder#consume(java.nio.ByteBuffer) |
| */ |
| @Override |
| public boolean consume(ByteBuffer buffer) { |
| while ((getValue() == null) && buffer.remaining() > 0) { |
| switch (state) { |
| case STREAM_DEPENDENCY: |
| if (decoder.consume(buffer)) { |
| builder.streamDependencyID(((IntPartialDecoder)decoder).getValue() & HTTP2_31BITS_MASK); |
| builder.exclusiveMode((((IntPartialDecoder)decoder).getValue() & HTTP2_EXCLUSIVE_MASK) == HTTP2_EXCLUSIVE_MASK); |
| state = State.WEIGHT; |
| } |
| break; |
| case WEIGHT: |
| builder.weight((short) ((buffer.get() & 0x00FF) + 1)); |
| int extraLength = getHeader().getLength() - 5; |
| if (extraLength > 0) { |
| decoder = new BytePartialDecoder(extraLength); |
| state = State.EXTRA; |
| } else { |
| setValue(builder.build()); |
| } |
| break; |
| case EXTRA: |
| if (decoder.consume(buffer)) { |
| setValue(builder.build()); |
| } |
| break; |
| } |
| } |
| return getValue() != null; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.mina.http2.api.PartialDecoder#reset() |
| */ |
| @Override |
| public void reset() { |
| } |
| |
| } |