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- /*
- * Copyright 2005 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;
-
- /**
- * 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 {
-
- 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 = new FOUserAgent();
- 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 = new Fop(getTargetFormat(), userAgent);
- fop.setOutputStream(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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