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/*
* Copyright 2005-2006 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.visual;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.MessageFormat;
import javax.xml.transform.Transformer;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.commons.io.IOUtils;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
/**
* BitmapProducer implementation that uses the PS or PDF renderer and an external converter
* to create bitmaps.
* <p>
* Here's what the configuration element looks like for the class:
* <p>
* <pre>
* <producer classname="<concrete class>">
* <converter>mypdf2bmp {0} {1} {2}</converter>
* <delete-temp-files>false</delete-temp-files>
* </producer>
* </pre>
* <p>
* You will notice the three parameters in curly braces (java.util.MessageFormat style) to the
* converter call:
* <ul>
* <li>0: the input file
* <li>1: the output bitmap file
* <li>2: the requested resolution in dpi for the generated bitmap
* </ul>
* <p>
* The "delete-temp-files" element is optional and defaults to true.
*/
public abstract class AbstractPSPDFBitmapProducer extends AbstractBitmapProducer
implements Configurable {
// configure fopFactory as desired
private FopFactory fopFactory = FopFactory.newInstance();
private String converter;
private boolean deleteTempFiles;
/** @see org.apache.avalon.framework.configuration.Configurable */
public void configure(Configuration cfg) throws ConfigurationException {
this.converter = cfg.getChild("converter").getValue();
this.deleteTempFiles = cfg.getChild("delete-temp-files").getValueAsBoolean(true);
}
/**
* Calls an external converter to convert the file generated by FOP to a bitmap.
* @param inFile the generated output file to be converted
* @param outFile the target filename for the bitmap
* @param context context information (required bitmap resolution etc.)
* @throws IOException in case the conversion fails
*/
public void convert(File inFile, File outFile, ProducerContext context) throws IOException {
outFile.delete();
//Build command-line
String cmd = MessageFormat.format(converter,
new Object[] {inFile.toString(), outFile.toString(),
Integer.toString(context.getTargetResolution())});
ConvertUtils.convert(cmd, null, null, log);
if (!outFile.exists()) {
throw new IOException("The target file has not been generated");
}
}
/**
* @return the native extension generated by the output format, ex. "ps" or "pdf".
*/
protected abstract String getTargetExtension();
/**
* @return the output format for the FOP renderer, i.e. a MIME type.
*/
protected abstract String getTargetFormat();
/** @see org.apache.fop.visual.BitmapProducer */
public BufferedImage produce(File src, ProducerContext context) {
try {
FOUserAgent userAgent = fopFactory.newFOUserAgent();
userAgent.setTargetResolution(context.getTargetResolution());
userAgent.setBaseURL(src.getParentFile().toURL().toString());
File tempOut = new File(context.getTargetDir(),
src.getName() + "." + getTargetExtension());
File tempPNG = new File(context.getTargetDir(),
src.getName() + "." + getTargetExtension() + ".png");
try {
OutputStream out = new FileOutputStream(tempOut);
out = new BufferedOutputStream(out);
try {
Fop fop = fopFactory.newFop(getTargetFormat(), userAgent, out);
SAXResult res = new SAXResult(fop.getDefaultHandler());
Transformer transformer = getTransformer(context);
transformer.transform(new StreamSource(src), res);
} finally {
IOUtils.closeQuietly(out);
}
convert(tempOut, tempPNG, context);
BufferedImage img = BitmapComparator.getImage(tempPNG);
return img;
} finally {
if (deleteTempFiles) {
if (!tempOut.delete()) {
log.warn("Can't delete " + tempOut);
tempOut.deleteOnExit();
}
if (!tempPNG.delete()) {
log.warn("Can't delete " + tempPNG);
tempPNG.deleteOnExit();
}
}
}
} catch (Exception e) {
e.printStackTrace();
log.error(e);
return null;
}
}
}
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