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.store.kahadb.disk.journal;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.RandomAccessFile;
  
  /**
   * Allows you to open a data file in read only mode.  Useful when working with 
   * archived data files.
   */
  public class ReadOnlyDataFile extends DataFile {
  
      ReadOnlyDataFile(File file, int number) {
          super(file, number);
      }
      
      public RandomAccessFile openRandomAccessFile(boolean appender) throws IOException {
          return new RandomAccessFile(file, "r");
      }
  
      public void closeRandomAccessFile(RandomAccessFile file) throws IOException {
          file.close();
      }
  
      public synchronized boolean delete() throws IOException {
          throw new RuntimeException("Not valid on a read only file.");
      }
      
      public synchronized void move(File targetDirectory) throws IOException{
          throw new RuntimeException("Not valid on a read only file.");
      }
  
  }
  