/*
* $Id: ImageReaderFactory.java,v 1.6.2.4 2003/02/25 13:38:24 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.image.analyser;
// Java
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.util.List;
// FOP
import org.apache.fop.image.FopImageException;
/**
* Factory for ImageReader objects.
* @author Pankaj Narula
*/
public class ImageReaderFactory {
protected static List formats = null;
static {
/**@todo make configurable one day...*/
formats = new java.util.Vector();
try {
registerImageReader("org.apache.fop.image.analyser.JPEGReader");
registerImageReader("org.apache.fop.image.analyser.BMPReader");
registerImageReader("org.apache.fop.image.analyser.GIFReader");
registerImageReader("org.apache.fop.image.analyser.PNGReader");
registerImageReader("org.apache.fop.image.analyser.TIFFReader");
registerImageReader("org.apache.fop.image.analyser.EPSReader");
registerImageReader("org.apache.fop.image.analyser.SVGReader");
} catch (ClassNotFoundException cnfe) {
throw new RuntimeException("One of the default ImageReader implementations is not available: "+cnfe.getMessage());
}
}
/**
* Registers a new ImageReader implementation.
*
* @param classname The fully qualified classname
* @throws ClassNotFoundException In case the given class cannot be found
*/
public static void registerImageReader(String classname) throws ClassNotFoundException {
Class clazz = Class.forName(classname);
registerImageReader(clazz);
}
/**
* Registers a new ImageReader implementation.
*
* @param clazz The ImageReader implementation class.
*/
public static void registerImageReader(Class clazz) {
if (!ImageReader.class.isAssignableFrom(clazz)) throw new RuntimeException("This class does not implement the ImageReader interface: "+clazz.getName());
formats.add(clazz);
}
/**
* ImageReader maker.
*
* @param uri URI of the image
* @param in image input stream
* @return ImageReader object
* @exception FopImageException an error occured during creation or
* image type is not supported
*/
public static ImageReader Make(String uri,
InputStream in) throws FopImageException {
ImageReader reader;
BufferedInputStream bis = new BufferedInputStream(in);
try {
for (int i = 0; i< formats.size(); i++) {
Class clazz = (Class)formats.get(i);
try {
reader = (ImageReader)clazz.newInstance();
} catch (Exception e) {
throw new FopImageException("ImageReader implementation cannot be instantiated: "+e.getMessage());
}
if (reader.verifySignature(uri, bis)) {
return reader;
}
}
} catch (IOException ex) {
throw new FopImageException(ex.getMessage());
}
return null;
}
}