bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/property/svg/SVGTextFactory.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2011 Association for Decentralized Information Management in\r
   3  * Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.modeling.ui.property.svg;\r
  13 \r
  14 import java.io.IOException;\r
  15 import java.io.StringReader;\r
  16 import java.io.StringWriter;\r
  17 \r
  18 import javax.xml.parsers.DocumentBuilder;\r
  19 import javax.xml.parsers.DocumentBuilderFactory;\r
  20 import javax.xml.parsers.ParserConfigurationException;\r
  21 \r
  22 import org.simantics.browsing.ui.swt.widgets.impl.ReadFactoryImpl;\r
  23 import org.simantics.databoard.Bindings;\r
  24 import org.simantics.db.ReadGraph;\r
  25 import org.simantics.db.Resource;\r
  26 import org.simantics.db.exception.DatabaseException;\r
  27 import org.simantics.diagram.stubs.G2DResource;\r
  28 import org.w3c.dom.Document;\r
  29 import org.w3c.dom.bootstrap.DOMImplementationRegistry;\r
  30 import org.w3c.dom.ls.DOMImplementationLS;\r
  31 import org.w3c.dom.ls.LSOutput;\r
  32 import org.w3c.dom.ls.LSSerializer;\r
  33 import org.xml.sax.InputSource;\r
  34 import org.xml.sax.SAXException;\r
  35 \r
  36 \r
  37 /**\r
  38  * @author Antti Villberg\r
  39  */\r
  40 public class SVGTextFactory extends ReadFactoryImpl<SVGInput, String> {\r
  41 \r
  42     @Override\r
  43     public String perform(ReadGraph graph, SVGInput input) throws DatabaseException {\r
  44         G2DResource G2D = G2DResource.getInstance(graph);\r
  45         Resource element = input.getDatum();\r
  46         String exp = graph.getPossibleRelatedValue(element, G2D.HasSVGDocument, Bindings.STRING);\r
  47         return exp != null ? XMLPrettyPrinter.safePrettyPrint(exp) : "";\r
  48     }\r
  49 \r
  50 }\r
  51 \r
  52 /**\r
  53  * @author Antti Villberg\r
  54  */\r
  55 class XMLPrettyPrinter {\r
  56 \r
  57     private static DOMImplementationRegistry registry;\r
  58 \r
  59     static {\r
  60         try {\r
  61             registry = DOMImplementationRegistry.newInstance();\r
  62         } catch (ClassCastException e) {\r
  63             e.printStackTrace();\r
  64         } catch (ClassNotFoundException e) {\r
  65             e.printStackTrace();\r
  66         } catch (InstantiationException e) {\r
  67             e.printStackTrace();\r
  68         } catch (IllegalAccessException e) {\r
  69             e.printStackTrace();\r
  70         }\r
  71     }\r
  72 \r
  73     public static Document parseDocument(String document) throws IOException, SAXException, ParserConfigurationException {\r
  74         InputSource xmlSource = new InputSource(new StringReader(document)); \r
  75         DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();\r
  76         dbFactory.setExpandEntityReferences(false);\r
  77         dbFactory.setValidating(false);\r
  78 //        dbFactory.setFeature("http://xml.org/sax/features/validation", false);\r
  79 //        dbFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);\r
  80         dbFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);\r
  81 //        dbFactory.setFeature("http://xml.org/sax/features/namespaces", false);\r
  82 //        dbFactory.setFeature("http://apache.org/xml/features/validation/schema", false);\r
  83 //        dbFactory.setFeature("http://apache.org/xml/features/validation/schema-full-checking", false);\r
  84         DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();\r
  85         return dBuilder.parse(xmlSource);\r
  86     }\r
  87 \r
  88     public static String prettyPrint(String document) throws IOException, SAXException, ParserConfigurationException {\r
  89 //        long start = System.nanoTime();\r
  90         Document doc = parseDocument(document);\r
  91 \r
  92         DOMImplementationLS impl = (DOMImplementationLS)registry.getDOMImplementation("LS");\r
  93         LSSerializer serializer = impl.createLSSerializer();\r
  94         serializer.getDomConfig().setParameter("format-pretty-print", Boolean.TRUE);\r
  95         LSOutput lsOutput = impl.createLSOutput();\r
  96         lsOutput.setEncoding("UTF-8");\r
  97         StringWriter stringWriter = new StringWriter();\r
  98         lsOutput.setCharacterStream(stringWriter);\r
  99         serializer.setNewLine("\n");\r
 100         serializer.write(doc, lsOutput);\r
 101         String formatted = stringWriter.toString();\r
 102 \r
 103 //        long duration = System.nanoTime() - start;\r
 104 //        System.out.println("Pretty print took " + 1e-9*duration + "s.");\r
 105 //        System.out.println("original: " + document);\r
 106 //        System.out.println("formatted: " + formatted);\r
 107 \r
 108         return formatted;\r
 109     }\r
 110 \r
 111     public static String safePrettyPrint(String document) {\r
 112         try {\r
 113             return prettyPrint(document);\r
 114         } catch (Exception e) {\r
 115             e.printStackTrace();\r
 116             return "";\r
 117         }\r
 118     }\r
 119 \r
 120 }