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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.image.analyser;
// Java
import java.io.InputStream;
import java.io.IOException;
import java.awt.geom.AffineTransform;
// XML
import org.w3c.dom.Element;
import org.w3c.dom.svg.SVGDocument;
// Batik
import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.dom.svg.SVGOMDocument;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.UnitProcessor;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
// FOP
import org.apache.fop.image.XMLImage;
import org.apache.fop.image.FopImage;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.svg.SVGUserAgent;
/**
* ImageReader object for SVG document image type.
*/
public class SVGReader implements ImageReader {
/** Logger instance */
protected static Log log = LogFactory.getLog(SVGReader.class);
/** SVG's MIME type */
public static final String SVG_MIME_TYPE = "image/svg+xml";
private boolean batik = true;
/** @see org.apache.fop.image.analyser.ImageReader */
public FopImage.ImageInfo verifySignature(String uri, InputStream fis,
FOUserAgent ua) throws IOException {
FopImage.ImageInfo info = loadImage(uri, fis, ua);
if (info != null) {
IOUtils.closeQuietly(fis);
}
return info;
}
/**
* Returns the MIME type supported by this implementation.
*
* @return The MIME type
*/
public String getMimeType() {
return SVG_MIME_TYPE;
}
/**
* This means the external svg document will be loaded twice. Possibly need
* a slightly different design for the image stuff.
*
* @param uri @todo Description of the Parameter
* @param fis @todo Description of the Parameter
* @param ua @todo Description of the Parameter
* @return @todo Description of the Return Value
*/
private FopImage.ImageInfo loadImage(String uri, InputStream bis,
FOUserAgent ua) {
if (batik) {
try {
Loader loader = new Loader();
return loader.getImage(uri, bis,
ua.getSourcePixelUnitToMillimeter());
} catch (NoClassDefFoundError e) {
batik = false;
log.warn("Batik not in class path", e);
return null;
}
}
return null;
}
/**
* This method is put in another class so that the classloader does not
* attempt to load batik related classes when constructing the SVGReader
* class.
*/
class Loader {
private FopImage.ImageInfo getImage(String uri, InputStream fis,
float pixelUnitToMM) {
// parse document and get the size attributes of the svg element
try {
int length = 5;
fis.mark(length);
byte[] b = new byte[length];
fis.read(b);
String start = new String(b);
fis.reset();
//TODO "true ||" here is a hack to improve SVG detection rate. Please improve.
if (true || start.equals("<?xml")) {
// we have xml, might be another doc
// so stop batik from closing the stream
final InputStream input = fis;
fis =
new InputStream() {
public int read() throws IOException {
return input.read();
}
public int read(byte[] b) throws IOException {
return input.read(b);
}
public int read(byte[] b, int off, int len)
throws IOException {
return input.read(b, off, len);
}
public long skip(long n) throws IOException {
return input.skip(n);
}
public int available() throws IOException {
return input.available();
}
public void mark(int rl) {
input.mark(rl);
}
public boolean markSupported() {
return input.markSupported();
}
public void reset() throws IOException {
input.reset();
}
public void close() throws IOException {
//ignore
}
};
}
FopImage.ImageInfo info = new FopImage.ImageInfo();
//Set the resolution to that of the FOUserAgent
info.dpiHorizontal = 25.4f / pixelUnitToMM;
info.dpiVertical = info.dpiHorizontal;
info.originalURI = uri;
info.mimeType = getMimeType();
info.str = SVGDOMImplementation.SVG_NAMESPACE_URI;
length = fis.available();
fis.mark(length + 1);
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(
XMLImage.getParserName());
SVGDocument doc = (SVGDocument) factory.createSVGDocument(uri, fis);
info.data = doc;
Element e = doc.getRootElement();
String s;
SVGUserAgent userAg = new SVGUserAgent(pixelUnitToMM,
new AffineTransform());
BridgeContext ctx = new BridgeContext(userAg);
UnitProcessor.Context uctx = UnitProcessor.createContext(ctx, e);
// 'width' attribute - default is 100%
s = e.getAttributeNS(null,
SVGOMDocument.SVG_WIDTH_ATTRIBUTE);
if (s.length() == 0) {
s = SVGOMDocument.SVG_SVG_WIDTH_DEFAULT_VALUE;
}
info.width = Math.round(UnitProcessor.svgHorizontalLengthToUserSpace(
s, SVGOMDocument.SVG_WIDTH_ATTRIBUTE, uctx));
// 'height' attribute - default is 100%
s = e.getAttributeNS(null,
SVGOMDocument.SVG_HEIGHT_ATTRIBUTE);
if (s.length() == 0) {
s = SVGOMDocument.SVG_SVG_HEIGHT_DEFAULT_VALUE;
}
info.height = Math.round(UnitProcessor.svgVerticalLengthToUserSpace(
s, SVGOMDocument.SVG_HEIGHT_ATTRIBUTE, uctx));
return info;
} catch (NoClassDefFoundError ncdfe) {
try {
fis.reset();
} catch (IOException ioe) {
// we're more interested in the original exception
}
batik = false;
log.warn("Batik not in class path", ncdfe);
return null;
} catch (Exception e) {
// If the svg is invalid then it throws an IOException
// so there is no way of knowing if it is an svg document
log.debug("Error while trying to load stream as an SVG file: "
+ e.getMessage());
// assuming any exception means this document is not svg
// or could not be loaded for some reason
try {
fis.reset();
} catch (IOException ioe) {
// we're more interested in the original exception
}
return null;
}
}
}
}
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