1 | /*
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2 | * SVGLoader.java
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3 | *
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4 | *
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5 | * The Salamander Project - 2D and 3D graphics libraries in Java
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6 | * Copyright (C) 2004 Mark McKay
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7 | *
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8 | * This library is free software; you can redistribute it and/or
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9 | * modify it under the terms of the GNU Lesser General Public
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10 | * License as published by the Free Software Foundation; either
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11 | * version 2.1 of the License, or (at your option) any later version.
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12 | *
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13 | * This library is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 | * Lesser General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU Lesser General Public
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19 | * License along with this library; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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21 | *
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22 | * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
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23 | * projects can be found at http://www.kitfox.com
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24 | *
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25 | * Created on February 18, 2004, 5:09 PM
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26 | */
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27 |
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28 | package com.kitfox.svg;
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29 |
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30 |
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31 | import java.util.*;
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32 | import java.net.*;
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33 | import org.xml.sax.*;
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34 | import org.xml.sax.helpers.DefaultHandler;
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35 |
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36 | /**
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37 | * @author Mark McKay
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38 | * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
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39 | */
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40 | public class SVGLoader extends DefaultHandler
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41 | {
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42 | final HashMap nodeClasses = new HashMap();
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43 | //final HashMap attribClasses = new HashMap();
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44 | final LinkedList buildStack = new LinkedList();
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45 |
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46 | final HashSet ignoreClasses = new HashSet();
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47 |
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48 | final SVGLoaderHelper helper;
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49 |
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50 | /**
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51 | * The diagram that represents the base of this SVG document we're loading.
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52 | * Will be augmented to include node indexing info and other useful stuff.
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53 | */
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54 | final SVGDiagram diagram;
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55 |
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56 | // SVGElement loadRoot;
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57 |
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58 | //Used to keep track of document elements that are not part of the SVG namespace
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59 | int skipNonSVGTagDepth = 0;
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60 | int indent = 0;
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61 |
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62 | final boolean verbose;
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63 |
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64 | /** Creates a new instance of SVGLoader */
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65 | public SVGLoader(URI xmlBase, SVGUniverse universe)
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66 | {
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67 | this(xmlBase, universe, false);
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68 | }
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69 |
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70 | public SVGLoader(URI xmlBase, SVGUniverse universe, boolean verbose)
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71 | {
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72 | this.verbose = verbose;
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73 |
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74 | diagram = new SVGDiagram(xmlBase, universe);
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75 |
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76 | //Compile a list of important builder classes
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77 | nodeClasses.put("a", A.class);
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78 | nodeClasses.put("circle", Circle.class);
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79 | nodeClasses.put("clippath", ClipPath.class);
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80 | nodeClasses.put("defs", Defs.class);
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81 | nodeClasses.put("desc", Desc.class);
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82 | nodeClasses.put("ellipse", Ellipse.class);
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83 | nodeClasses.put("filter", Filter.class);
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84 | nodeClasses.put("font", Font.class);
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85 | nodeClasses.put("font-face", FontFace.class);
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86 | nodeClasses.put("g", Group.class);
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87 | nodeClasses.put("glyph", Glyph.class);
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88 | nodeClasses.put("hkern", Hkern.class);
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89 | nodeClasses.put("image", ImageSVG.class);
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90 | nodeClasses.put("line", Line.class);
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91 | nodeClasses.put("lineargradient", LinearGradient.class);
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92 | nodeClasses.put("marker", Marker.class);
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93 | nodeClasses.put("metadata", Metadata.class);
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94 | nodeClasses.put("missing-glyph", MissingGlyph.class);
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95 | nodeClasses.put("path", Path.class);
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96 | nodeClasses.put("pattern", PatternSVG.class);
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97 | nodeClasses.put("polygon", Polygon.class);
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98 | nodeClasses.put("polyline", Polyline.class);
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99 | nodeClasses.put("radialgradient", RadialGradient.class);
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100 | nodeClasses.put("rect", Rect.class);
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101 | nodeClasses.put("shape", ShapeElement.class);
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102 | nodeClasses.put("stop", Stop.class);
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103 | nodeClasses.put("style", Style.class);
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104 | nodeClasses.put("svg", SVGRoot.class);
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105 | nodeClasses.put("symbol", Symbol.class);
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106 | nodeClasses.put("text", Text.class);
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107 | nodeClasses.put("title", Title.class);
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108 | nodeClasses.put("tspan", Tspan.class);
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109 | nodeClasses.put("use", Use.class);
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110 |
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111 | ignoreClasses.add("midpointstop");
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112 |
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113 | //attribClasses.put("clip-path", StyleUrl.class);
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114 | //attribClasses.put("color", StyleColor.class);
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115 |
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116 | helper = new SVGLoaderHelper(xmlBase, universe, diagram);
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117 | }
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118 |
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119 | private String printIndent(int indent, String indentStrn)
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120 | {
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121 | StringBuffer sb = new StringBuffer();
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122 | for (int i = 0; i < indent; i++)
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123 | {
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124 | sb.append(indentStrn);
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125 | }
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126 | return sb.toString();
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127 | }
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128 |
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129 | public void startDocument() throws SAXException
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130 | {
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131 | // System.err.println("Start doc");
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132 |
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133 | // buildStack.clear();
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134 | }
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135 |
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136 | public void endDocument() throws SAXException
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137 | {
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138 | // System.err.println("End doc");
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139 | }
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140 |
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141 | public void startElement(String namespaceURI, String sName, String qName, Attributes attrs) throws SAXException
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142 | {
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143 | if (verbose)
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144 | {
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145 | System.err.println(printIndent(indent, " ") + "Starting parse of tag " + sName+ ": " + namespaceURI);
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146 | }
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147 | indent++;
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148 |
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149 | if (skipNonSVGTagDepth != 0 || (!namespaceURI.equals("") && !namespaceURI.equals(SVGElement.SVG_NS)))
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150 | {
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151 | skipNonSVGTagDepth++;
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152 | return;
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153 | }
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154 |
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155 | sName = sName.toLowerCase();
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156 |
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157 | //javax.swing.JOptionPane.showMessageDialog(null, sName);
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158 |
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159 | Object obj = nodeClasses.get(sName);
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160 | if (obj == null)
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161 | {
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162 | if (!ignoreClasses.contains(sName))
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163 | {
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164 | if (verbose)
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165 | {
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166 | System.err.println("SVGLoader: Could not identify tag '" + sName + "'");
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167 | }
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168 | }
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169 | return;
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170 | }
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171 |
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172 | //Debug info tag depth
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173 | //for (int i = 0; i < buildStack.size(); i++) System.err.print(" ");
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174 | //System.err.println("+" + sName);
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175 |
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176 | try {
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177 | Class cls = (Class)obj;
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178 | SVGElement svgEle = (SVGElement)cls.newInstance();
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179 |
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180 | SVGElement parent = null;
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181 | if (buildStack.size() != 0) parent = (SVGElement)buildStack.getLast();
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182 | svgEle.loaderStartElement(helper, attrs, parent);
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183 |
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184 | buildStack.addLast(svgEle);
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185 | }
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186 | catch (Exception e)
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187 | {
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188 | e.printStackTrace();
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189 | throw new SAXException(e);
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190 | }
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191 |
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192 | }
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193 |
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194 | public void endElement(String namespaceURI, String sName, String qName)
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195 | throws SAXException
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196 | {
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197 | indent--;
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198 | if (verbose)
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199 | {
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200 | System.err.println(printIndent(indent, " ") + "Ending parse of tag " + sName+ ": " + namespaceURI);
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201 | }
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202 |
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203 | if (skipNonSVGTagDepth != 0)
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204 | {
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205 | skipNonSVGTagDepth--;
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206 | return;
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207 | }
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208 |
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209 | sName = sName.toLowerCase();
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210 |
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211 | Object obj = nodeClasses.get(sName);
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212 | if (obj == null) return;
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213 |
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214 | //Debug info tag depth
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215 | //for (int i = 0; i < buildStack.size(); i++) System.err.print(" ");
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216 | //System.err.println("-" + sName);
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217 |
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218 | try {
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219 | SVGElement svgEle = (SVGElement)buildStack.removeLast();
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220 |
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221 | svgEle.loaderEndElement(helper);
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222 |
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223 | SVGElement parent = null;
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224 | if (buildStack.size() != 0) parent = (SVGElement)buildStack.getLast();
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225 | //else loadRoot = (SVGElement)svgEle;
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226 |
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227 | if (parent != null) parent.loaderAddChild(helper, svgEle);
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228 | else diagram.setRoot((SVGRoot)svgEle);
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229 |
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230 | }
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231 | catch (Exception e)
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232 | {
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233 | e.printStackTrace();
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234 | throw new SAXException(e);
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235 | }
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236 | }
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237 |
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238 | public void characters(char buf[], int offset, int len)
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239 | throws SAXException
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240 | {
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241 | if (skipNonSVGTagDepth != 0)
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242 | {
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243 | return;
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244 | }
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245 |
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246 | if (buildStack.size() != 0)
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247 | {
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248 | SVGElement parent = (SVGElement)buildStack.getLast();
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249 | String s = new String(buf, offset, len);
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250 | parent.loaderAddText(helper, s);
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251 | }
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252 | }
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253 |
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254 | public void processingInstruction(String target, String data)
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255 | throws SAXException
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256 | {
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257 | //Check for external style sheet
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258 | }
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259 |
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260 | // public SVGElement getLoadRoot() { return loadRoot; }
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261 | public SVGDiagram getLoadedDiagram() { return diagram; }
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262 | }
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