XML DOM Utilities : DOM « XML « Java





XML DOM Utilities

     
import java.io.OutputStream;
import java.io.Writer;
import java.util.Vector;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

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

//<p></p><p></p><p></p><p></p>
public class XMLUtils {

  public static DocumentBuilder getDOMBuilder() throws ParserConfigurationException {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    dbf.setNamespaceAware(true);
    return dbf.newDocumentBuilder();
  }

  public static Transformer getTransformer() throws TransformerConfigurationException {
    TransformerFactory tf = TransformerFactory.newInstance();
    return tf.newTransformer();
  }

  public static Document createDocument() throws ParserConfigurationException {
    return XMLUtils.getDOMBuilder().newDocument();
  }

  public static Element firstChildElement(Node node) {
    for (Node tempNode = node.getFirstChild(); tempNode != null; tempNode = tempNode
        .getNextSibling()) {
      if (tempNode.getNodeType() == Node.ELEMENT_NODE) {
        return (Element) tempNode;
      }
    }
    return null;
  }

  public static Element nextSiblingElement(Node node) {
    for (Node tempNode = node.getNextSibling(); tempNode != null; tempNode = tempNode
        .getNextSibling()) {
      if (tempNode.getNodeType() == Node.ELEMENT_NODE) {
        return (Element) tempNode;
      }
    }
    return null;
  }

  public static Element lastChildElement(Node node) {
    for (Node tempNode = node.getLastChild(); tempNode != null; tempNode = tempNode
        .getPreviousSibling()) {
      if (tempNode.getNodeType() == Node.ELEMENT_NODE) {
        return (Element) tempNode;
      }
    }
    return null;
  }

  public static Element previousSiblingElement(Node node) {
    for (Node tempNode = node.getPreviousSibling(); tempNode != null; tempNode = tempNode
        .getPreviousSibling()) {
      if (tempNode.getNodeType() == Node.ELEMENT_NODE) {
        return (Element) tempNode;
      }
    }
    return null;
  }

  public static Vector getAllChildElements(Node node) {
    Vector v = new Vector();
    Node child = XMLUtils.firstChildElement(node);
    while (child != null) {
      v.add(child);
      child = XMLUtils.nextSiblingElement(child);
    }
    return v;
  }

  public static Vector getChildElementsByNS(Node node, String uri, String localName) {
    Vector childElements = XMLUtils.getAllChildElements(node);
    Vector v = new Vector();
    for (int i = 0; i < childElements.size(); i++) {
      Element child = (Element) childElements.get(i);
      String ln = child.getLocalName();
      String u = child.getNamespaceURI();
      if (uri == null) {
        if (ln.equals(localName)) {
          v.add(child);
        }
      } else {
        if (ln.equals(localName) && u.equals(uri)) {
          v.add(child);
        }
      }
    }
    return v;
  }

  public static String getLocalName(String nodeName) {
    int index = nodeName.lastIndexOf(58);
    if (index == -1) {
      return nodeName;
    } else {
      return nodeName.substring(index + 1, nodeName.length());
    }
  }

  public static String getPrefix(String nodeName) {
    int index = nodeName.lastIndexOf(58);
    if (index == -1) {
      return null;
    } else {
      return nodeName.substring(0, index);
    }
  }

  public static void outDOMNode(Node node, Writer writer) throws TransformerConfigurationException,
      TransformerException {
    Transformer transformer = XMLUtils.getTransformer();
    Source source = new DOMSource(node);
    Result result = new StreamResult(writer);
    transformer.transform(source, result);
  }

  public static void outDOMNode(Node node, OutputStream os)
      throws TransformerConfigurationException, TransformerException {
    Transformer transformer = XMLUtils.getTransformer();
    Source source = new DOMSource(node);
    Result result = new StreamResult(os);
    transformer.transform(source, result);
  }
}

   
    
    
    
    
  










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