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annotate src/share/tools/IdealGraphVisualizer/BatikSVGProxy/src/com/sun/hotspot/igv/svg/BatikSVG.java @ 18983:43baadc1913a

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Automatically install Batik for SVG export in IGV
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Tue, 27 Jan 2015 15:47:34 -0800
parents bf4f8817e3bd
children
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1 /*
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2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24 package com.sun.hotspot.igv.svg;
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25
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26 import java.awt.Graphics2D;
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27 import java.io.Writer;
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28 import java.io.File;
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29 import java.lang.reflect.Constructor;
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30 import java.lang.reflect.InvocationTargetException;
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31 import java.lang.reflect.Method;
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32 import java.net.MalformedURLException;
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33 import java.net.URL;
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34 import java.net.URLClassLoader;
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35 import org.w3c.dom.DOMImplementation;
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36
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37 /**
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38 * Utility class
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39 * @author Thomas Wuerthinger
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40 */
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41 public class BatikSVG {
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42
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43 private BatikSVG() {
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44 }
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45
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46 private static Constructor SVGGraphics2DConstructor;
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47 private static Method streamMethod;
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48 private static Method createDefaultMethod;
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49 private static Method getDOMImplementationMethod;
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50 private static Method setEmbeddedFontsOnMethod;
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51 private static Class<?> classSVGGraphics2D;
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52
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53 /**
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54 * Creates a graphics object that allows to be exported to SVG data using the {@link #printToStream(Graphics2D, Writer, boolean) printToStream} method.
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55 * @return the newly created Graphics2D object or null if the library does not exist
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56 */
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57 public static Graphics2D createGraphicsObject() {
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58 try {
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59 if (SVGGraphics2DConstructor == null) {
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60 String batikJar = System.getenv().get("IGV_BATIK_JAR");
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61 if (batikJar == null) {
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62 return null;
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63 }
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64 // Load batik in it's own class loader since some it's support jars interfere with the JDK
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65 URL url = new File(batikJar).toURI().toURL();
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66 ClassLoader cl = new URLClassLoader(new URL[] { url });
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67 Class<?> classGenericDOMImplementation = cl.loadClass("org.apache.batik.dom.GenericDOMImplementation");
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68 Class<?> classSVGGeneratorContext = cl.loadClass("org.apache.batik.svggen.SVGGeneratorContext");
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69 classSVGGraphics2D = cl.loadClass("org.apache.batik.svggen.SVGGraphics2D");
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70 getDOMImplementationMethod = classGenericDOMImplementation.getDeclaredMethod("getDOMImplementation", new Class[0]);
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71 createDefaultMethod = classSVGGeneratorContext.getDeclaredMethod("createDefault", new Class[]{org.w3c.dom.Document.class});
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72 setEmbeddedFontsOnMethod = classSVGGeneratorContext.getDeclaredMethod("setEmbeddedFontsOn", new Class[]{boolean.class});
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73 streamMethod = classSVGGraphics2D.getDeclaredMethod("stream", Writer.class, boolean.class);
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74 SVGGraphics2DConstructor = classSVGGraphics2D.getConstructor(classSVGGeneratorContext, boolean.class);
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75 }
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76 DOMImplementation dom = (DOMImplementation) getDOMImplementationMethod.invoke(null);
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77 org.w3c.dom.Document document = dom.createDocument("http://www.w3.org/2000/svg", "svg", null);
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78 Object ctx = createDefaultMethod.invoke(null, document);
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79 setEmbeddedFontsOnMethod.invoke(ctx, true);
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80 Graphics2D svgGenerator = (Graphics2D) SVGGraphics2DConstructor.newInstance(ctx, true);
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81 return svgGenerator;
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82 } catch (ClassNotFoundException e) {
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83 return null;
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84 } catch (NoSuchMethodException e) {
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85 return null;
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86 } catch (IllegalAccessException e) {
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87 return null;
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88 } catch (InvocationTargetException e) {
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89 return null;
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90 } catch (InstantiationException e) {
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91 return null;
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92 } catch (MalformedURLException e) {
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93 return null;
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94 }
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95 }
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96
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97 /**
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98 * Serializes a graphics object to a stream in SVG format.
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99 * @param svgGenerator the graphics object. Only graphics objects created by the {@link #createGraphicsObject() createGraphicsObject} method are valid.
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100 * @param stream the stream to which the data is written
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101 * @param useCSS whether to use CSS styles in the SVG output
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102 */
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103 public static void printToStream(Graphics2D svgGenerator, Writer stream, boolean useCSS) {
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104 assert classSVGGraphics2D != null;
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105 assert classSVGGraphics2D.isInstance(svgGenerator);
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106 try {
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107 streamMethod.invoke(svgGenerator, stream, useCSS);
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108 } catch (IllegalAccessException e) {
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109 assert false;
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110 } catch (InvocationTargetException e) {
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111 assert false;
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112 }
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113 }
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114 }