Source Code : DOM Utilities

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DOM Utilities

 


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

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

public class TestDOM {
  public static void main(String[] args) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder parser = factory.newDocumentBuilder();
    Document document = parser.parse("zooinventory.xml");
    Element inventory = document.getDocumentElement();
    NodeList animals = inventory.getElementsByTagName("Animal");

    System.out.println("Animals = ");
    for (int i = 0; i < animals.getLength(); i++) {
      String name = DOMUtil.getSimpleElementText((Element) animals.item(i), "Name");
      String species = DOMUtil.getSimpleElementText((Element) animals.item(i), "Species");
      System.out.println("  " + name + " (" + species + ")");
    }

    Element foodRecipe = DOMUtil.getFirstElement((Element) animals.item(1), "FoodRecipe");
    String name = DOMUtil.getSimpleElementText(foodRecipe, "Name");
    System.out.println("Recipe = " + name);
    NodeList ingredients = foodRecipe.getElementsByTagName("Ingredient");
    for (int i = 0; i < ingredients.getLength(); i++)
      System.out.println("  " + DOMUtil.getSimpleElementText((Element) ingredients.item(i)));
  }
}

class DOMUtil {
  public static Element getFirstElement(Element element, String name) {
    NodeList nl = element.getElementsByTagName(name);
    if (nl.getLength() < 1)
      throw new RuntimeException("Element: " + element + " does not contain: " + name);
    return (Element) nl.item(0);
  }

  public static String getSimpleElementText(Element node, String name) {
    Element namedElement = getFirstElement(node, name);
    return getSimpleElementText(namedElement);
  }

  public static String getSimpleElementText(Element node) {
    StringBuffer sb = new StringBuffer();
    NodeList children = node.getChildNodes();
    for (int i = 0; i < children.getLength(); i++) {
      Node child = children.item(i);
      if (child instanceof Text)
        sb.append(child.getNodeValue());
    }
    return sb.toString();
  }
}

//File: zooinventory.xml
/*<?xml version="1.0" encoding="UTF-8"?>

<Element2>
  <Element3 animalClass="mammal">
    <Name>A</Name>
    <Species>B</Species>
    <Habitat>C</Habitat>
    <Food>D</Food>
    <Temperament>E</Temperament>
    <Weight>1</Weight>
  </Element3>
  <Element3 animalClass="mammal">
    <Name>F</Name>
    <Species>G</Species>
    <Habitat>H</Habitat>
    <ElementA>
      <Name>I</Name>
      <Ingredient>I1</Ingredient>
      <Ingredient>I2</Ingredient>
      <Ingredient>I2</Ingredient>
    </ElementA>
    <Temperament>J</Temperament>
    <Weight>4</Weight>
  </Element3>
</Element2>
*/

   
  

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