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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.notification.spool.utils.local;
  
  import java.io.IOException;
  import java.io.RandomAccessFile;
  import java.nio.channels.FileChannel;
  import java.nio.channels.FileLock;
  
  public class FileOpDelete extends FileOperation {
      public FileOpDelete(String source) {
          super(source);
      }
  
      @Override
      public FileLock run(RandomAccessFile file, FileChannel channel, String json) throws IOException {
          final FileLock ret;
          final long     position = find(file, getId());
  
          if (position < 0) {
              ret = null;
          } else {
              ret = channel.tryLock(position, json.length(), false);
  
              channel.position(position);
  
              file.writeBytes(json);
          }
  
          return ret;
      }
  }
  