1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* 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.loader.batik;
import java.awt.geom.AffineTransform;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import org.w3c.dom.Element;
import org.w3c.dom.svg.SVGDocument;
import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.UnitProcessor;
import org.apache.batik.bridge.UserAgent;
import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.dom.svg.SVGOMDocument;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.util.MimeConstants;
import org.apache.fop.svg.SimpleSVGUserAgent;
import org.apache.fop.util.UnclosableInputStream;
/**
* Image preloader for SVG images.
*/
public class PreloaderSVG extends AbstractImagePreloader {
/** Logger instance */
private static Log log = LogFactory.getLog(PreloaderSVG.class);
private boolean batikAvailable = true;
/** {@inheritDoc} */
public ImageInfo preloadImage(String uri, Source src, ImageContext context)
throws IOException {
ImageInfo info = null;
if (batikAvailable) {
try {
Loader loader = new Loader();
if (!loader.isSupportedSource(src)) {
return null;
}
info = loader.getImage(uri, src, context);
} catch (NoClassDefFoundError e) {
batikAvailable = false;
log.warn("Batik not in class path", e);
return null;
}
}
if (info != null) {
ImageUtil.closeQuietly(src); //Image is fully read
}
return info;
}
/**
* Returns the fully qualified classname of an XML parser for
* Batik classes that apparently need it (error messages, perhaps)
* @return an XML parser classname
*/
public static String getParserName() {
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
return factory.newSAXParser().getXMLReader().getClass().getName();
} catch (Exception e) {
return null;
}
}
/**
* This method is put in another class so that the class loader does not
* attempt to load Batik related classes when constructing the SVGPreloader
* class.
*/
class Loader {
private ImageInfo getImage(String uri, Source src,
ImageContext context) {
// parse document and get the size attributes of the svg element
InputStream in = null;
try {
SVGDocument doc;
if (src instanceof DOMSource) {
DOMSource domSrc = (DOMSource)src;
doc = (SVGDocument)domSrc.getNode();
} else {
in = new UnclosableInputStream(ImageUtil.needInputStream(src));
int length = in.available();
in.mark(length + 1);
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(
getParserName());
doc = (SVGDocument) factory.createSVGDocument(src.getSystemId(), in);
}
ImageInfo info = createImageInfo(uri, context, doc);
return info;
} catch (NoClassDefFoundError ncdfe) {
if (in != null) {
try {
in.reset();
} catch (IOException ioe) {
// we're more interested in the original exception
}
}
batikAvailable = false;
log.warn("Batik not in class path", ncdfe);
return null;
} catch (IOException 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 {
in.reset();
} catch (IOException ioe) {
// we're more interested in the original exception
}
return null;
}
}
private ImageInfo createImageInfo(String uri, ImageContext context, SVGDocument doc) {
Element e = doc.getRootElement();
float pxUnitToMillimeter = 25.4f / context.getSourceResolution();
UserAgent userAg = new SimpleSVGUserAgent(pxUnitToMillimeter,
new AffineTransform()) {
/** {@inheritDoc} */
public void displayMessage(String message) {
log.debug(message);
}
};
BridgeContext ctx = new BridgeContext(userAg);
UnitProcessor.Context uctx = UnitProcessor.createContext(ctx, e);
String s;
// 'width' attribute - default is 100%
s = e.getAttributeNS(null, SVGOMDocument.SVG_WIDTH_ATTRIBUTE);
if (s.length() == 0) {
s = SVGOMDocument.SVG_SVG_WIDTH_DEFAULT_VALUE;
}
float width = 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;
}
float height = UnitProcessor.svgVerticalLengthToUserSpace(
s, SVGOMDocument.SVG_HEIGHT_ATTRIBUTE, uctx);
ImageInfo info = new ImageInfo(uri, MimeConstants.MIME_SVG);
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
ImageXMLDOM xmlImage = new ImageXMLDOM(info,
doc, SVGDOMImplementation.SVG_NAMESPACE_URI);
info.getCustomObjects().put(ImageInfo.ORIGINAL_IMAGE, xmlImage);
return info;
}
private boolean isSupportedSource(Source src) {
if (src instanceof DOMSource) {
DOMSource domSrc = (DOMSource)src;
return (domSrc.getNode() instanceof SVGDocument);
} else {
return ImageUtil.hasInputStream(src);
}
}
}
}
|
