bundles/org.simantics.utils/src/org/simantics/utils/xml/Node.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in 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.utils.xml;\r
  13 \r
  14 import java.io.File;\r
  15 import java.io.IOException;\r
  16 import java.util.Iterator;\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.w3c.dom.NodeList;\r
  23 import org.xml.sax.SAXException;\r
  24 \r
  25 \r
  26 public class Node implements Iterable<Node> {\r
  27     public static final short ELEMENT_NODE              = org.w3c.dom.Node.ELEMENT_NODE;\r
  28     public static final short ATTRIBUTE_NODE            = org.w3c.dom.Node.ATTRIBUTE_NODE;\r
  29     public static final short TEXT_NODE                 = org.w3c.dom.Node.TEXT_NODE;\r
  30     public static final short CDATA_SECTION_NODE        = org.w3c.dom.Node.CDATA_SECTION_NODE;\r
  31     public static final short ENTITY_REFERENCE_NODE     = org.w3c.dom.Node.ENTITY_REFERENCE_NODE;\r
  32     public static final short ENTITY_NODE               = org.w3c.dom.Node.ENTITY_NODE;\r
  33     public static final short PROCESSING_INSTRUCTION_NODE = org.w3c.dom.Node.PROCESSING_INSTRUCTION_NODE;\r
  34     public static final short COMMENT_NODE              = org.w3c.dom.Node.COMMENT_NODE;\r
  35     public static final short DOCUMENT_NODE             = org.w3c.dom.Node.DOCUMENT_NODE;\r
  36     public static final short DOCUMENT_TYPE_NODE        = org.w3c.dom.Node.DOCUMENT_TYPE_NODE;\r
  37     public static final short DOCUMENT_FRAGMENT_NODE    = org.w3c.dom.Node.DOCUMENT_FRAGMENT_NODE;\r
  38     public static final short NOTATION_NODE             = org.w3c.dom.Node.NOTATION_NODE;\r
  39         \r
  40         private org.w3c.dom.Node node;\r
  41 \r
  42         public Node(org.w3c.dom.Node node) {\r
  43                 this.node = node;\r
  44         }\r
  45         \r
  46         public Node(File file) throws IOException {\r
  47                 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();\r
  48                 DocumentBuilder builder;\r
  49                 try {\r
  50                         builder = factory.newDocumentBuilder();         \r
  51                         node = builder.parse(file);\r
  52                 } catch (ParserConfigurationException e) {\r
  53                         throw new IOException(e);\r
  54                 } catch (SAXException e) {\r
  55                         throw new IOException(e);\r
  56                 }\r
  57         }\r
  58 \r
  59         static class NodeIterator implements Iterator<Node> {\r
  60                 NodeList list;          \r
  61                 int      i;\r
  62                 int      length;\r
  63 \r
  64                 public NodeIterator(NodeList list) {\r
  65                         this.list = list;\r
  66                         i = 0;\r
  67                         length = list.getLength();\r
  68                 }\r
  69 \r
  70                 @Override\r
  71                 public boolean hasNext() {\r
  72                         return i<length;\r
  73                 }\r
  74 \r
  75                 @Override\r
  76                 public Node next() {\r
  77                         return new Node(list.item(i++));\r
  78                 }\r
  79 \r
  80                 @Override\r
  81                 public void remove() {\r
  82                         throw new UnsupportedOperationException();\r
  83                 }               \r
  84                 \r
  85         }\r
  86         \r
  87         @Override\r
  88         public Iterator<Node> iterator() {\r
  89                 return new NodeIterator(node.getChildNodes());\r
  90         }       \r
  91         \r
  92         public String name() {\r
  93                 return node.getNodeName();\r
  94         }\r
  95         \r
  96         public String value() {\r
  97                 return node.getNodeValue().trim();              \r
  98         }\r
  99         \r
 100         public int type() {\r
 101                 return node.getNodeType();\r
 102         }\r
 103         \r
 104         public Node parent() {\r
 105                 return new Node(node.getParentNode());\r
 106         }\r
 107         \r
 108         public Node get(String key) {\r
 109                 return new Node(node.getAttributes().getNamedItem(key));\r
 110         }\r
 111         \r
 112         public String getValue(String key) {\r
 113                 return node.getAttributes().getNamedItem(key).getNodeValue().trim();            \r
 114         }\r
 115         \r
 116         public int childCount() {\r
 117                 return node.getChildNodes().getLength();\r
 118         }\r
 119         \r
 120         public String text() {\r
 121                 return node.getTextContent().trim();\r
 122         }\r
 123         \r
 124         public Node getSingleChild(String type) {\r
 125                 NodeList nodeList = node.getChildNodes();\r
 126                 Node child = null;\r
 127                 for(int i=0;i<nodeList.getLength();++i) {\r
 128                         org.w3c.dom.Node c = nodeList.item(i);\r
 129                         if(c.getNodeName().equals(type)) {\r
 130                                 if(child == null)\r
 131                                         child = new Node(c);\r
 132                                 else\r
 133                                         System.out.println("Child of type " + type + " is not unique.");\r
 134                         }\r
 135                 }\r
 136                 return child;\r
 137         }\r
 138         \r
 139         @Override\r
 140         public boolean equals(Object obj) {\r
 141                 return this == obj || (obj instanceof Node && node.equals(((Node)obj).node));\r
 142         }\r
 143         \r
 144 }\r
 145 \r