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/*
* 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) 2009 Pentaho Corporation. All rights reserved.
*/
package org.pentaho.reporting.libraries.base.encoder;
import java.util.HashMap;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.base.util.PngEncoder;
/**
* Todo: Document Me
*
* @author Thomas Morgner
*/
public class ImageEncoderRegistry
{
private static ImageEncoderRegistry instance;
private HashMap encoders;
public static final String IMAGE_PNG = "image/png";
public static final String IMAGE_JPEG = "image/jpeg";
public static synchronized ImageEncoderRegistry getInstance()
{
if (instance == null)
{
instance = new ImageEncoderRegistry();
instance.registerDefaults();
}
return instance;
}
private ImageEncoderRegistry()
{
encoders = new HashMap();
}
private void registerDefaults()
{
encoders.put (IMAGE_PNG, PngEncoder.class.getName());
if (JpegImageEncoder.isJpegEncodingAvailable())
{
encoders.put(IMAGE_JPEG, JpegImageEncoder.class.getName());
encoders.put("image/jpg", JpegImageEncoder.class.getName());
}
}
public void addEncoder(final String mimeType, final String encoderClass)
{
if (mimeType == null)
{
throw new NullPointerException();
}
if (encoderClass == null)
{
throw new NullPointerException();
}
encoders.put(mimeType, encoderClass);
}
public boolean isEncoderAvailable(final String mimeType)
{
return encoders.containsKey(mimeType);
}
public String[] getRegisteredEncoders()
{
return (String[]) encoders.keySet().toArray(new String[encoders.size()]);
}
public ImageEncoder createEncoder(final String mimeType) throws UnsupportedEncoderException
{
final Object o = encoders.get(mimeType);
if (o == null)
{
throw new UnsupportedEncoderException("No encoder for mime-type " + mimeType);
}
final ImageEncoder imageEncoder = (ImageEncoder)
ObjectUtilities.loadAndInstantiate((String) o, ImageEncoderRegistry.class, ImageEncoder.class);
if (imageEncoder == null)
{
throw new UnsupportedEncoderException("No encoder for mime-type " + mimeType);
}
return imageEncoder;
}
}
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