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/*
* 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.render.svg;
import java.awt.Rectangle;
import java.io.IOException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
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.ImageFlavor;
import org.apache.xmlgraphics.image.loader.impl.ImageRawStream;
import org.apache.xmlgraphics.image.loader.impl.ImageXMLDOM;
import org.apache.fop.image.loader.batik.BatikImageFlavors;
import org.apache.fop.render.ImageHandler;
import org.apache.fop.render.RenderingContext;
import org.apache.fop.render.intermediate.DelegatingFragmentContentHandler;
/**
* Image handler implementation that embeds SVG images in the target SVG file.
*/
public class EmbeddedSVGImageHandler implements ImageHandler, SVGConstants {
/** logging instance */
private static Log log = LogFactory.getLog(EmbeddedSVGImageHandler.class);
/** Constant for the "CDATA" attribute type. */
private static final String CDATA = "CDATA";
/** {@inheritDoc} */
public int getPriority() {
return 500;
}
/** {@inheritDoc} */
public Class getSupportedImageClass() {
return ImageRawStream.class;
}
/** {@inheritDoc} */
public ImageFlavor[] getSupportedImageFlavors() {
return new ImageFlavor[] {
BatikImageFlavors.SVG_DOM
};
}
/*
private void addAttribute(AttributesImpl atts, QName attribute, String value) {
atts.addAttribute(attribute.getNamespaceURI(),
attribute.getLocalName(), attribute.getQName(), CDATA, value);
}
*/
/** {@inheritDoc} */
public void handleImage(RenderingContext context, Image image, final Rectangle pos)
throws IOException {
SVGRenderingContext svgContext = (SVGRenderingContext)context;
if (!(image instanceof ImageXMLDOM)) {
throw new IllegalStateException();
}
ImageXMLDOM svg = (ImageXMLDOM) image;
ContentHandler handler = svgContext.getContentHandler();
AttributesImpl atts = new AttributesImpl();
atts.addAttribute("", "x", "x", CDATA, SVGUtil.formatMptToPt(pos.x));
atts.addAttribute("", "y", "y", CDATA, SVGUtil.formatMptToPt(pos.y));
atts.addAttribute("", "width", "width", CDATA, SVGUtil.formatMptToPt(pos.width));
atts.addAttribute("", "height", "height", CDATA, SVGUtil.formatMptToPt(pos.height));
try {
Document doc = (Document)svg.getDocument();
Element svgEl = (Element)doc.getDocumentElement();
if (svgEl.getAttribute("viewBox").length() == 0) {
log.warn("SVG doesn't have a viewBox. The result might not be scaled correctly!");
}
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
DOMSource src = new DOMSource(svg.getDocument());
SAXResult res = new SAXResult(new DelegatingFragmentContentHandler(handler) {
private boolean topLevelSVGFound;
private void setAttribute(AttributesImpl atts, String localName, String value) {
int index;
index = atts.getIndex("", localName);
if (index < 0) {
atts.addAttribute("", localName, localName, CDATA, value);
} else {
atts.setAttribute(index, "", localName, localName, CDATA, value);
}
}
public void startElement(String uri, String localName, String name, Attributes atts)
throws SAXException {
if (!topLevelSVGFound
&& SVG_ELEMENT.getNamespaceURI().equals(uri)
&& SVG_ELEMENT.getLocalName().equals(localName)) {
topLevelSVGFound = true;
AttributesImpl modAtts = new AttributesImpl(atts);
setAttribute(modAtts, "x", SVGUtil.formatMptToPt(pos.x));
setAttribute(modAtts, "y", SVGUtil.formatMptToPt(pos.y));
setAttribute(modAtts, "width", SVGUtil.formatMptToPt(pos.width));
setAttribute(modAtts, "height", SVGUtil.formatMptToPt(pos.height));
super.startElement(uri, localName, name, modAtts);
} else {
super.startElement(uri, localName, name, atts);
}
}
});
transformer.transform(src, res);
} catch (TransformerException te) {
throw new IOException(te.getMessage());
}
}
/** {@inheritDoc} */
public boolean isCompatible(RenderingContext targetContext, Image image) {
if (targetContext instanceof SVGRenderingContext) {
if (image == null) {
return true;
}
if (image instanceof ImageXMLDOM) {
ImageXMLDOM svg = (ImageXMLDOM)image;
return NAMESPACE.equals(svg.getRootNamespace());
}
}
return false;
}
}
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