| /* |
| * 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.xmlgraphics.io.XmlSourceUtil; |
| |
| 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; |
| } |
| |
| } |