123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134 |
- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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.plan;
-
- import java.io.IOException;
- import java.io.InputStream;
-
- import javax.xml.transform.ErrorListener;
- import javax.xml.transform.Source;
- import javax.xml.transform.Transformer;
- import javax.xml.transform.TransformerException;
- import javax.xml.transform.TransformerFactory;
- import javax.xml.transform.dom.DOMResult;
- import javax.xml.transform.stream.StreamSource;
-
- import org.w3c.dom.Document;
- import org.w3c.dom.Element;
-
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
-
- import org.apache.xmlgraphics.image.loader.Image;
- import org.apache.xmlgraphics.image.loader.ImageContext;
- import org.apache.xmlgraphics.image.loader.ImageInfo;
- import org.apache.xmlgraphics.image.loader.ImageSize;
- import org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader;
- import org.apache.xmlgraphics.image.loader.impl.ImageXMLDOM;
- import org.apache.xmlgraphics.image.loader.util.ImageUtil;
-
- import org.apache.fop.util.DefaultErrorListener;
- import org.apache.fop.util.UnclosableInputStream;
-
- /**
- * Image preloader for Plan images.
- */
- public class PreloaderPlan extends AbstractImagePreloader {
-
- /** Logger instance */
- private static Log log = LogFactory.getLog(PreloaderPlan.class);
-
- /** {@inheritDoc} */
- public ImageInfo preloadImage(String uri, Source src, ImageContext context)
- throws IOException {
- if (!ImageUtil.hasInputStream(src)) {
- //TODO Remove this and support DOMSource and possibly SAXSource
- return null;
- }
- ImageInfo info = getImage(uri, src, context);
- if (info != null) {
- ImageUtil.closeQuietly(src); //Image is fully read
- }
- return info;
- }
-
- private ImageInfo getImage(String uri, Source src, ImageContext context) throws IOException {
-
- InputStream in = new UnclosableInputStream(ImageUtil.needInputStream(src));
- try {
- Document planDoc = getDocument(in);
- Element rootEl = planDoc.getDocumentElement();
- if (!PlanElementMapping.NAMESPACE.equals(
- rootEl.getNamespaceURI())) {
- in.reset();
- return null;
- }
-
- //Have to render the plan to know its size
- PlanRenderer pr = new PlanRenderer();
- Document svgDoc = pr.createSVGDocument(planDoc);
- float width = pr.getWidth();
- float height = pr.getHeight();
-
- //Return converted SVG image
- ImageInfo info = new ImageInfo(uri, "image/svg+xml");
- final ImageSize size = new ImageSize();
- size.setSizeInMillipoints(
- Math.round(width * 1000),
- Math.round(height * 1000));
- //Set the resolution to that of the FOUserAgent
- size.setResolution(context.getSourceResolution());
- size.calcPixelsFromSize();
- info.setSize(size);
-
- //The whole image had to be loaded for this, so keep it
- Image image = new ImageXMLDOM(info, svgDoc,
- svgDoc.getDocumentElement().getNamespaceURI());
- info.getCustomObjects().put(ImageInfo.ORIGINAL_IMAGE, image);
-
- return info;
- } catch (TransformerException e) {
- try {
- in.reset();
- } catch (IOException ioe) {
- // we're more interested in the original exception
- }
- log.debug("Error while trying to parsing a Plan file: "
- + e.getMessage());
- return null;
- }
- }
-
- private Document getDocument(InputStream in) throws TransformerException {
- TransformerFactory tFactory = TransformerFactory.newInstance();
- //Custom error listener to minimize output to console
- ErrorListener errorListener = new DefaultErrorListener(log);
- tFactory.setErrorListener(errorListener);
- Transformer transformer = tFactory.newTransformer();
- transformer.setErrorListener(errorListener);
- Source source = new StreamSource(in);
- DOMResult res = new DOMResult();
- transformer.transform(source, res);
-
- Document doc = (Document)res.getNode();
- return doc;
- }
-
- }
|