/**
 * 
 */
package at.gv.egiz.pdfas.impl.input.helper;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import at.gv.egiz.pdfas.performance.PerformanceCounters;
import at.gv.egiz.pdfas.framework.input.DataSource;
import at.gv.egiz.pdfas.framework.input.PdfDataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author wprinz
 * 
 */
public class DataSourceHelper
{
  /**
   * The log.
   */
  private static final Log log = LogFactory.getLog(DataSourceHelper.class);

  /**
   * Converts a PdfDataSource to a byte array.
   * 
   * <p>
   * Note that this function is very memory intensive. Use the Streams whereever
   * possible.
   * </p>
   * 
   * @deprecated
   * 
   * @param pdfDataSource
   * @return
   * @throws IOException
   */
  public static byte[] convertDataSourceToByteArray(DataSource pdfDataSource)
  {
    return pdfDataSource.getAsByteArray();
//    try
//    {
//      PerformanceCounters.byteArrays.increment();
//
//      byte[] data = new byte[pdfDataSource.getLength()];
//
//      int bytes_written = 0;
//
//      InputStream is = pdfDataSource.createInputStream();
//      int n = 0;
//      while ((n = is.read(data, bytes_written, data.length - bytes_written)) > 0)
//      {
//        bytes_written += n;
//      }
//      is.close();
//
//      assert bytes_written == data.length;
//
//      return data;
//    }
//    catch (IOException e)
//    {
//      log.error(e);
//      throw new RuntimeException(e);
//    }
  }
  
  public static byte [] convertInputStreamToByteArray(InputStream inputStream)
  {
    try
    {
      PerformanceCounters.byteArrays.increment();

      ByteArrayOutputStream baos = new ByteArrayOutputStream(4096);
      
      byte[] temp = new byte[4096];

      int n = 0;
      while ((n = inputStream.read(temp)) > 0)
      {
        baos.write(temp, 0, n);
      }
      inputStream.close();

      baos.close();
      byte [] data = baos.toByteArray();
      
      return data;
    }
    catch (IOException e)
    {
      log.error(e);
      throw new RuntimeException(e);
    }
  }
  
  public static void debugDataSourceToFile(DataSource dataSource, File file)
  {
    try
    {
      InputStream is = dataSource.createInputStream();
      FileOutputStream fos = new FileOutputStream(file);
      byte[] data = new byte[2048];
      int n = -1;
      while ((n = is.read(data)) > 0)
      {
        fos.write(data, 0, n);
      }
      is.close();
      fos.close();
    }
    catch (IOException e)
    {
      log.error(e);
    }
  }
}