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.broker.region;
  
  import org.apache.activemq.command.ActiveMQMessage;
  import org.apache.activemq.command.ConsumerId;
  import org.apache.activemq.command.Message;
  import org.apache.activemq.command.MessageId;
  
  /**
   * Used by the {@link QueueMessageReference#NULL_MESSAGE}
   */
  public final class NullMessageReference implements QueueMessageReference {
  
      private final ActiveMQMessage message = new ActiveMQMessage();
      private volatile int references;
  
      @Override
      public void drop() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public synchronized boolean dropIfLive() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public LockOwner getLockOwner() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public boolean isAcked() {
          return false;
      }
  
      @Override
      public boolean isDropped() {
          return false;
      }
  
      @Override
      public boolean lock(LockOwner subscription) {
          return true;
      }
  
      @Override
      public void setAcked(boolean b) {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public boolean unlock() {
          return true;
      }
  
      @Override
      public int decrementReferenceCount() {
          return --references;
      }
  
      @Override
      public long getExpiration() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public String getGroupID() {
          return null;
      }
  
      @Override
      public int getGroupSequence() {
          return 0;
      }
  
      @Override
      public Message getMessage()  {
          return message;
      }
  
      @Override
      public Message getMessageHardRef() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public MessageId getMessageId() {
          return message.getMessageId();
      }
  
      @Override
      public int getRedeliveryCounter() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public int getReferenceCount() {
          return references;
      }
  
      @Override
      public Destination getRegionDestination() {
          return null;
      }
  
      @Override
      public int getSize() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public ConsumerId getTargetConsumerId() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public void incrementRedeliveryCounter() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public int incrementReferenceCount() {
          return ++references;
      }
  
      @Override
      public boolean isExpired() {
          return false;
      }
  
      @Override
      public boolean isPersistent() {
          throw new RuntimeException("not implemented");
      }
  
      @Override
      public boolean isAdvisory() {
          return false;
      }
  
      @Override
      public boolean canProcessAsExpired() {
          return false;
      }
  
  }
  