001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.transport.amqp;
018
019import org.fusesource.hawtbuf.Buffer;
020
021/**
022 */
023public class AmqpHeader {
024
025    static final Buffer PREFIX = new Buffer(new byte[] { 'A', 'M', 'Q', 'P' });
026
027    private Buffer buffer;
028
029    public AmqpHeader() {
030        this(new Buffer(new byte[] { 'A', 'M', 'Q', 'P', 0, 1, 0, 0 }));
031    }
032
033    public AmqpHeader(Buffer buffer) {
034        this(buffer, true);
035    }
036
037    public AmqpHeader(Buffer buffer, boolean validate) {
038        setBuffer(buffer, validate);
039    }
040
041    public int getProtocolId() {
042        return buffer.get(4) & 0xFF;
043    }
044
045    public void setProtocolId(int value) {
046        buffer.data[buffer.offset + 4] = (byte) value;
047    }
048
049    public int getMajor() {
050        return buffer.get(5) & 0xFF;
051    }
052
053    public void setMajor(int value) {
054        buffer.data[buffer.offset + 5] = (byte) value;
055    }
056
057    public int getMinor() {
058        return buffer.get(6) & 0xFF;
059    }
060
061    public void setMinor(int value) {
062        buffer.data[buffer.offset + 6] = (byte) value;
063    }
064
065    public int getRevision() {
066        return buffer.get(7) & 0xFF;
067    }
068
069    public void setRevision(int value) {
070        buffer.data[buffer.offset + 7] = (byte) value;
071    }
072
073    public Buffer getBuffer() {
074        return buffer;
075    }
076
077    public void setBuffer(Buffer value) {
078        setBuffer(value, true);
079    }
080
081    public void setBuffer(Buffer value, boolean validate) {
082        if (validate && !value.startsWith(PREFIX) || value.length() != 8) {
083            throw new IllegalArgumentException("Not an AMQP header buffer");
084        }
085        buffer = value.buffer();
086    }
087
088    public boolean hasValidPrefix() {
089        return buffer.startsWith(PREFIX);
090    }
091
092    @Override
093    public String toString() {
094        StringBuilder builder = new StringBuilder();
095        for (int i = 0; i < buffer.length(); ++i) {
096            char value = (char) buffer.get(i);
097            if (Character.isLetter(value)) {
098                builder.append(value);
099            } else {
100                builder.append(",");
101                builder.append((int) value);
102            }
103        }
104        return builder.toString();
105    }
106}