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/* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources."
*/
package org.apache.fop.image;
// Java
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.MalformedURLException;
import java.lang.reflect.Constructor;
import java.util.Hashtable;
// FOP
import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.image.analyser.ImageReaderFactory;
import org.apache.fop.image.analyser.ImageReader;
import org.apache.fop.configuration.Configuration;
/**
* create FopImage objects (with a configuration file - not yet implemented).
* @author Eric SCHAEFFER
*/
public class FopImageFactory {
private static Hashtable m_urlMap = new Hashtable();
/**
* create an FopImage objects.
* @param href image URL as a String
* @return a new FopImage object
* @exception java.net.MalformedURLException bad URL
* @exception FopImageException an error occured during construction
*/
public static FopImage Make(String href)
throws MalformedURLException, FopImageException {
// Get the absolute URL
URL absoluteURL = null;
InputStream imgIS = null;
try {
absoluteURL = new URL(href);
imgIS = absoluteURL.openStream();
} catch (Exception e) {
// maybe relative
URL context_url = null;
try {
String baseDir = Configuration.getStringValue("baseDir");
context_url = new URL(baseDir); // how to get the context URL ?
try {
absoluteURL = new URL(context_url, href);
} catch (MalformedURLException e_abs) {
// not found
throw new FopImageException( "Invalid Image URL : " +
e_abs.getMessage() + "(base URL " +
context_url.toString() + ")");
}
} catch (MalformedURLException e_context) {
// pb context url
throw new FopImageException(
"Invalid Image URL - error on relative URL : " +
e_context.getMessage());
}
}
// check if already created
FopImage imageObject =
(FopImage) m_urlMap.get(absoluteURL.toString());
if (imageObject != null)
return imageObject;
// If not, check image type
ImageReader imgReader = null;
try {
if (imgIS == null) {
imgIS = absoluteURL.openStream();
}
imgReader = ImageReaderFactory.Make(absoluteURL.toExternalForm(), imgIS);
} catch (Exception e) {
throw new FopImageException(
"Error while recovering Image Informations (" +
absoluteURL.toString() + ") : " + e.getMessage());
}
finally { if (imgIS != null) {
try {
imgIS.close();
} catch (IOException e) {}
}
} if (imgReader == null)
throw new FopImageException(
"No ImageReader for this type of image (" +
absoluteURL.toString() + ")");
// Associate mime-type to FopImage class
String imgMimeType = imgReader.getMimeType();
String imgClassName = null;
if ("image/gif".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.GifJpegImage";
// imgClassName = "org.apache.fop.image.JAIImage";
} else if ("image/jpeg".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.GifJpegImage";
// imgClassName = "org.apache.fop.image.JAIImage";
} else if ("image/bmp".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.BmpImage";
// imgClassName = "org.apache.fop.image.JAIImage";
} else if ("image/png".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.JimiImage";
// imgClassName = "org.apache.fop.image.JAIImage";
} else if ("image/tga".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.JimiImage";
// imgClassName = "org.apache.fop.image.JAIImage";
} else if ("image/tiff".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.JimiImage";
// imgClassName = "org.apache.fop.image.JAIImage";
} else if ("image/svg-xml".equals(imgMimeType)) {
imgClassName = "org.apache.fop.image.SVGImage";
}
if (imgClassName == null)
throw new FopImageException("Unsupported image type (" +
absoluteURL.toString() + ") : " + imgMimeType);
// load the right image class
// return new <FopImage implementing class>
Object imageInstance = null;
Class imageClass = null;
try {
imageClass = Class.forName(imgClassName);
Class[] imageConstructorParameters = new Class[2];
imageConstructorParameters[0] = Class.forName("java.net.URL");
imageConstructorParameters[1] = Class.forName("org.apache.fop.image.analyser.ImageReader");
Constructor imageConstructor =
imageClass.getDeclaredConstructor(
imageConstructorParameters);
Object[] initArgs = new Object[2];
initArgs[0] = absoluteURL;
initArgs[1] = imgReader;
imageInstance = imageConstructor.newInstance(initArgs);
} catch (java.lang.reflect.InvocationTargetException ex) {
Throwable t = ex.getTargetException();
String msg;
if (t != null) {
msg = t.getMessage();
} else {
msg = ex.getMessage();
}
throw new FopImageException(
"Error creating FopImage object (" +
absoluteURL.toString() + ") : " + msg);
}
catch (Exception ex) {
throw new FopImageException(
"Error creating FopImage object (" +
"Error creating FopImage object (" +
absoluteURL.toString() + ") : " + ex.getMessage());
}
if (! (imageInstance instanceof org.apache.fop.image.FopImage)) {
throw new FopImageException(
"Error creating FopImage object (" +
absoluteURL.toString() + ") : " + "class " +
imageClass.getName() + " doesn't implement org.apache.fop.image.FopImage interface");
}
m_urlMap.put(absoluteURL.toString(), imageInstance);
return (FopImage) imageInstance;
}
}
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