content: package org.apache.lucene.store;
  
  /**
   * 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.
   */
  
  import java.util.ArrayList;
  import java.io.Serializable;
  
  /** @lucene.internal */
  public class RAMFile implements Serializable {
  
    private static final long serialVersionUID = 1l;
  
    protected ArrayList<byte[]> buffers = new ArrayList<byte[]>();
    long length;
    RAMDirectory directory;
    protected long sizeInBytes;
  
    // This is publicly modifiable via Directory.touchFile(), so direct access not supported
    private long lastModified = System.currentTimeMillis();
  
    // File used as buffer, in no RAMDirectory
    public RAMFile() {}
    
    RAMFile(RAMDirectory directory) {
      this.directory = directory;
    }
  
    // For non-stream access from thread that might be concurrent with writing
    public synchronized long getLength() {
      return length;
    }
  
    protected synchronized void setLength(long length) {
      this.length = length;
    }
  
    // For non-stream access from thread that might be concurrent with writing
    public synchronized long getLastModified() {
      return lastModified;
    }
  
    protected synchronized void setLastModified(long lastModified) {
      this.lastModified = lastModified;
    }
  
    protected final byte[] addBuffer(int size) {
      byte[] buffer = newBuffer(size);
      synchronized(this) {
        buffers.add(buffer);
        sizeInBytes += size;
      }
  
      if (directory != null) {
        directory.sizeInBytes.getAndAdd(size);
      }
      return buffer;
    }
  
    protected final synchronized byte[] getBuffer(int index) {
      return buffers.get(index);
    }
  
    protected final synchronized int numBuffers() {
      return buffers.size();
    }
  
    /**
     * Expert: allocate a new buffer. 
     * Subclasses can allocate differently. 
     * @param size size of allocated buffer.
     * @return allocated buffer.
     */
    protected byte[] newBuffer(int size) {
      return new byte[size];
    }
  
    public synchronized long getSizeInBytes() {
      return sizeInBytes;
    }
    
  }
  