Utilities to read DOM : DOM « XML « Java

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Java » XML » DOMScreenshots 
Utilities to read DOM
     

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
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.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * Few simple utils to read DOM
 
 @author Costin Manolache
 */
public class DomUtil {
  // -------------------- DOM utils --------------------

  /**
   * Get the trimed text content of a node or null if there is no text
   */
  public static String getContent(Node n) {
    if (n == null)
      return null;
    Node n1 = DomUtil.getChild(n, Node.TEXT_NODE);

    if (n1 == null)
      return null;

    String s1 = n1.getNodeValue();
    return s1.trim();
  }

  /**
   * Get the first element child.
   
   @param parent
   *          lookup direct childs
   @param name
   *          name of the element. If null return the first element.
   */
  public static Node getChild(Node parent, String name) {
    if (parent == null)
      return null;
    Node first = parent.getFirstChild();
    if (first == null)
      return null;

    for (Node node = first; node != null; node = node.getNextSibling()) {
      // System.out.println("getNode: " + name + " " + node.getNodeName());
      if (node.getNodeType() != Node.ELEMENT_NODE)
        continue;
      if (name != null && name.equals(node.getNodeName())) {
        return node;
      }
      if (name == null) {
        return node;
      }
    }
    return null;
  }

  public static String getAttribute(Node element, String attName) {
    NamedNodeMap attrs = element.getAttributes();
    if (attrs == null)
      return null;
    Node attN = attrs.getNamedItem(attName);
    if (attN == null)
      return null;
    return attN.getNodeValue();
  }

  public static void setAttribute(Node node, String attName, String val) {
    NamedNodeMap attributes = node.getAttributes();
    Node attNode = node.getOwnerDocument().createAttribute(attName);
    attNode.setNodeValue(val);
    attributes.setNamedItem(attNode);
  }

  public static void removeAttribute(Node node, String attName) {
    NamedNodeMap attributes = node.getAttributes();
    attributes.removeNamedItem(attName);
  }

  /**
   * Set or replace the text value
   */
  public static void setText(Node node, String val) {
    Node chld = DomUtil.getChild(node, Node.TEXT_NODE);
    if (chld == null) {
      Node textN = node.getOwnerDocument().createTextNode(val);
      node.appendChild(textN);
      return;
    }
    // change the value
    chld.setNodeValue(val);
  }

  /**
   * Find the first direct child with a given attribute.
   
   @param parent
   @param elemName
   *          name of the element, or null for any
   @param attName
   *          attribute we're looking for
   @param attVal
   *          attribute value or null if we just want any
   */
  public static Node findChildWithAtt(Node parent, String elemName, String attName, String attVal) {

    Node child = DomUtil.getChild(parent, Node.ELEMENT_NODE);
    if (attVal == null) {
      while (child != null && (elemName == null || elemName.equals(child.getNodeName()))
          && DomUtil.getAttribute(child, attName!= null) {
        child = getNext(child, elemName, Node.ELEMENT_NODE);
      }
    else {
      while (child != null && (elemName == null || elemName.equals(child.getNodeName()))
          && !attVal.equals(DomUtil.getAttribute(child, attName))) {
        child = getNext(child, elemName, Node.ELEMENT_NODE);
      }
    }
    return child;
  }

  /**
   * Get the first child's content ( ie it's included TEXT node ).
   */
  public static String getChildContent(Node parent, String name) {
    Node first = parent.getFirstChild();
    if (first == null)
      return null;
    for (Node node = first; node != null; node = node.getNextSibling()) {
      // System.out.println("getNode: " + name + " " + node.getNodeName());
      if (name.equals(node.getNodeName())) {
        return getContent(node);
      }
    }
    return null;
  }

  /**
   * Get the first direct child with a given type
   */
  public static Node getChild(Node parent, int type) {
    Node n = parent.getFirstChild();
    while (n != null && type != n.getNodeType()) {
      n = n.getNextSibling();
    }
    if (n == null)
      return null;
    return n;
  }

  /**
   * Get the next sibling with the same name and type
   */
  public static Node getNext(Node current) {
    String name = current.getNodeName();
    int type = current.getNodeType();
    return getNext(current, name, type);
  }

  /**
   * Return the next sibling with a given name and type
   */
  public static Node getNext(Node current, String name, int type) {
    Node first = current.getNextSibling();
    if (first == null)
      return null;

    for (Node node = first; node != null; node = node.getNextSibling()) {

      if (type >= && node.getNodeType() != type)
        continue;
      // System.out.println("getNode: " + name + " " + node.getNodeName());
      if (name == null)
        return node;
      if (name.equals(node.getNodeName())) {
        return node;
      }
    }
    return null;
  }

  public static class NullResolver implements EntityResolver {
    public InputSource resolveEntity(String publicId, String systemIdthrows SAXException,
        IOException {

      return new InputSource(new StringReader(""));
    }
  }

  /**
   * Read XML as DOM.
   */
  public static Document readXml(InputStream isthrows SAXException, IOException,
      ParserConfigurationException {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

    dbf.setValidating(false);
    dbf.setIgnoringComments(false);
    dbf.setIgnoringElementContentWhitespace(true);
    // dbf.setCoalescing(true);
    // dbf.setExpandEntityReferences(true);

    DocumentBuilder db = null;
    db = dbf.newDocumentBuilder();
    db.setEntityResolver(new NullResolver());

    // db.setErrorHandler( new MyErrorHandler());

    Document doc = db.parse(is);
    return doc;
  }

  public static void writeXml(Node n, OutputStream osthrows TransformerException {
    TransformerFactory tf = TransformerFactory.newInstance();
    // identity
    Transformer t = tf.newTransformer();
    t.setOutputProperty(OutputKeys.INDENT, "yes");
    t.transform(new DOMSource(n)new StreamResult(os));
  }
}

   
    
    
    
    
  
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