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/*
 * Copyright (c) 1998-2018 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.server.distcache;

import java.io.IOException;
import java.io.InputStream;

import com.caucho.vfs.StreamSource;

/**
 * Stream source for Hessian serialization of large data
 */
public class DataStreamSource extends StreamSource
{
  private long _valueDataId;
  private long _valueDataTime;
  private DataStore _dataBacking;

  /**
   * Create a new GitStreamSource for the named file
   */
  public DataStreamSource(long valueDataId,
                          long valueDataTime,
                          DataStore dataBacking)
  {
    _valueDataId = valueDataId;
    _valueDataTime = valueDataTime;
    _dataBacking = dataBacking;

    /*
    if (dataBacking == null)
      throw new NullPointerException();
      */
  }

  /**
   * Returns an input stream, freeing the results
   */
  @Override
  public InputStream getInputStream()
    throws IOException
  {
    return openInputStream();
  }

  /**
   * Returns an input stream, without freeing the results
   */
  @Override
  public InputStream openInputStream()
    throws IOException
  {
    DataStore dataBacking = _dataBacking;
    
    if (dataBacking == null) {
      return null;
    }
    
    InputStream is = dataBacking.openInputStream(_valueDataId, _valueDataTime);
    
    return is;
  }
  
  public String toString()
  {
    return (getClass().getSimpleName()
            + "[" + Long.toHexString(_valueDataId)
            + "," + _dataBacking + "]");
  }
}