Attr: getValue() : Attr « org.w3c.dom « Java by API

1. Java by API
2. org.w3c.dom
3. Attr

Attr: getValue()

/*
DOCTYPE node:
<!ELEMENT circle (position)>
<!ATTLIST circle radius CDATA #REQUIRED>
<!ELEMENT position EMPTY>
<!ATTLIST position x CDATA #REQUIRED>
<!ATTLIST position y CDATA #REQUIRED>


Document body contents are:
 Node: circle
 Node Type: Element
 Element Attributes are:
 radius = 15
 Child Nodes of circle are:
   Node: position
   Node Type: Element
   Element Attributes are:
   x = 30
   y = 50
    */
import static org.w3c.dom.Node.ATTRIBUTE_NODE;
import static org.w3c.dom.Node.CDATA_SECTION_NODE;
import static org.w3c.dom.Node.COMMENT_NODE;
import static org.w3c.dom.Node.DOCUMENT_TYPE_NODE;
import static org.w3c.dom.Node.ELEMENT_NODE;
import static org.w3c.dom.Node.ENTITY_NODE;
import static org.w3c.dom.Node.ENTITY_REFERENCE_NODE;
import static org.w3c.dom.Node.NOTATION_NODE;
import static org.w3c.dom.Node.PROCESSING_INSTRUCTION_NODE;
import static org.w3c.dom.Node.TEXT_NODE;

import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class MainClass {
  public static void main(String args[]) {
    DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
    builderFactory.setValidating(true);           // and validating parser feaures
    builderFactory.setIgnoringElementContentWhitespace(true); 
    
    DocumentBuilder builder = null;
    try {
      builder = builderFactory.newDocumentBuilder();  // Create the parser
    } catch(ParserConfigurationException e) {
      e.printStackTrace();
    }
    Document xmlDoc = null;

    try {
      xmlDoc = builder.parse(new InputSource(new StringReader(xmlString)));

    } catch(SAXException e) {
      e.printStackTrace();

    } catch(IOException e) {
      e.printStackTrace();
    }
    DocumentType doctype = xmlDoc.getDoctype();       
    if(doctype == null) {                             
      System.out.println("DOCTYPE is null");
    } else {                                          
      System.out.println("DOCTYPE node:\n" + doctype.getInternalSubset());
    }

    System.out.println("\nDocument body contents are:");
    listNodes(xmlDoc.getDocumentElement(),"");         // Root element & children
  }
  static void listNodes(Node node, String indent) {
    String nodeName = node.getNodeName();
    System.out.println(indent+" Node: "+nodeName);
    short type =node.getNodeType();
    System.out.println(indent+" Node Type: " + nodeType(type));
    if(type == TEXT_NODE){
      System.out.println(indent+" Content is: "+((Text)node).getWholeText());
    } else if(node.hasAttributes()) {
      System.out.println(indent+" Element Attributes are:");
      NamedNodeMap attrs = node.getAttributes();  
      for(int i = 0 ; i<attrs.getLength() ; i++) {
        Attr attribute = (Attr)attrs.item(i);     
        System.out.println(indent+ " " + attribute.getName()+" = "+attribute.getValue());
      }
    }
    
    NodeList list = node.getChildNodes();       
    if(list.getLength() > 0) {                  
      System.out.println(indent+" Child Nodes of "+nodeName+" are:");
      for(int i = 0 ; i<list.getLength() ; i++) {
        listNodes(list.item(i),indent+"  ");      
      }
    }         
  }

  static String nodeType(short type) {
    switch(type) {
      case ELEMENT_NODE:                return "Element";
      case DOCUMENT_TYPE_NODE:          return "Document type";
      case ENTITY_NODE:                 return "Entity";
      case ENTITY_REFERENCE_NODE:       return "Entity reference";
      case NOTATION_NODE:               return "Notation";
      case TEXT_NODE:                   return "Text";
      case COMMENT_NODE:                return "Comment";
      case CDATA_SECTION_NODE:          return "CDATA Section";
      case ATTRIBUTE_NODE:              return "Attribute";
      case PROCESSING_INSTRUCTION_NODE: return "Attribute";
    }
    return "Unidentified";
  }

  static String xmlString ="<?xml version=\"1.0\"?>" +
      "<!DOCTYPE circle" +
      "[" +
      "   <!ELEMENT circle (position)>" +
      "   <!ATTLIST circle" +
      "             radius CDATA #REQUIRED" +
      "   >" +
      "   <!ELEMENT position EMPTY>" +
      "   <!ATTLIST position" +
      "             x CDATA #REQUIRED" +
      "             y CDATA #REQUIRED" +
      "   >" +
      "]>" +
      "<circle radius=\"15\">" +
      "  <position x=\"30\" y=\"50\"/>" +
      "</circle>";
}


           
       

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