content: /**
   * 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.activemq.transport.amqp;
  
  import org.fusesource.hawtbuf.Buffer;
  
  /**
   * Represents the AMQP protocol handshake packet that is sent during the
   * initial exchange with a remote peer.
   */
  public class AmqpHeader {
  
      static final Buffer PREFIX = new Buffer(new byte[] { 'A', 'M', 'Q', 'P' });
  
      private Buffer buffer;
  
      public AmqpHeader() {
          this(new Buffer(new byte[] { 'A', 'M', 'Q', 'P', 0, 1, 0, 0 }));
      }
  
      public AmqpHeader(Buffer buffer) {
          this(buffer, true);
      }
  
      public AmqpHeader(Buffer buffer, boolean validate) {
          setBuffer(buffer, validate);
      }
  
      public int getProtocolId() {
          return buffer.get(4) & 0xFF;
      }
  
      public void setProtocolId(int value) {
          buffer.data[buffer.offset + 4] = (byte) value;
      }
  
      public int getMajor() {
          return buffer.get(5) & 0xFF;
      }
  
      public void setMajor(int value) {
          buffer.data[buffer.offset + 5] = (byte) value;
      }
  
      public int getMinor() {
          return buffer.get(6) & 0xFF;
      }
  
      public void setMinor(int value) {
          buffer.data[buffer.offset + 6] = (byte) value;
      }
  
      public int getRevision() {
          return buffer.get(7) & 0xFF;
      }
  
      public void setRevision(int value) {
          buffer.data[buffer.offset + 7] = (byte) value;
      }
  
      public Buffer getBuffer() {
          return buffer;
      }
  
      public void setBuffer(Buffer value) {
          setBuffer(value, true);
      }
  
      public void setBuffer(Buffer value, boolean validate) {
          if (validate && !value.startsWith(PREFIX) || value.length() != 8) {
              throw new IllegalArgumentException("Not an AMQP header buffer");
          }
          buffer = value.buffer();
      }
  
      public boolean hasValidPrefix() {
          return buffer.startsWith(PREFIX);
      }
  
      @Override
      public String toString() {
          StringBuilder builder = new StringBuilder();
          for (int i = 0; i < buffer.length(); ++i) {
              char value = (char) buffer.get(i);
              if (Character.isLetter(value)) {
                  builder.append(value);
              } else {
                  builder.append(",");
                  builder.append((int) value);
              }
          }
          return builder.toString();
      }
  }
  