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JPEGImageFactoryModule.java
/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program 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.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors.  All rights reserved.
 */

package org.pentaho.reporting.libraries.resourceloader.factory.image;

import java.awt.Image;
import java.awt.Toolkit;
import java.io.InputStream;
import java.io.IOException;

import org.pentaho.reporting.libraries.resourceloader.factory.AbstractFactoryModule;
import org.pentaho.reporting.libraries.resourceloader.Resource;
import org.pentaho.reporting.libraries.resourceloader.ResourceData;
import org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException;
import org.pentaho.reporting.libraries.resourceloader.SimpleResource;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;

/**
 * Creation-Date: 05.04.2006, 17:35:12
 *
 * @author Thomas Morgner
 */
00038 public class JPEGImageFactoryModule extends AbstractFactoryModule
{
  private static final int[] FINGERPRINT_1 = {0xFF, 0xD8};

  private static final String[] MIMETYPES =
          {
            "image/jpeg",
            "image/jpg",
            "image/jp_",
            "application/jpg",
            "application/x-jpg",
            "image/pjpeg",
            "image/pipeg",
            "image/vnd.swiftview-jpeg",
            "image/x-xbitmap"
          };

  private static final String[] FILEEXTENSIONS =
          {
            ".jpg", ".jpeg"
          };
  private static final int[] EMPTY_ARRAY = new int[0];

  public JPEGImageFactoryModule()
  {
  }

  public int getHeaderFingerprintSize ()
  {
    // indicate that we cannot allow the generic fingerprinting. We need to test it by ourselfs.
    return -1;
  }

  protected boolean canHandleResourceByContent(final InputStream data)
          throws IOException
  {
    final int[] fingerprint = FINGERPRINT_1;
    for (int i = 0; i < fingerprint.length; i++)
    {
      if (fingerprint[i] != data.read())
      {
        return false;
      }
    }

    if (data.read() == -1)
    {
      return false;
    }
    if (data.read() == -1)
    {
      return false;
    }

//    fingerprint = FINGERPRINT_2;
//    for (int i = 0; i < fingerprint.length; i++)
//    {
//      if (fingerprint[i] != data.read())
//      {
//        return false;
//      }
//    }
    return true;
  }

  protected int[] getFingerPrint()
  {
    return EMPTY_ARRAY;
  }

  protected String[] getMimeTypes()
  {
    return (String[]) JPEGImageFactoryModule.MIMETYPES.clone();
  }

  protected String[] getFileExtensions()
  {
    return (String[]) JPEGImageFactoryModule.FILEEXTENSIONS.clone();
  }

  public Resource create(final ResourceManager caller,
                         final ResourceData data,
                         final ResourceKey context)
          throws ResourceLoadingException
  {
    final long version = data.getVersion(caller);
    final Image image =
            Toolkit.getDefaultToolkit().createImage(data.getResource(caller));
    return new SimpleResource (data.getKey(), image, Image.class, version);
  }
}

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