Prints the XML tree that is rooted at the specified node to the system default OutputStream (stdout). - Java XML

Java examples for XML:DOM Node

  1. HOME
  2. Java
  3. XML
  4. DOM Node

Description

Prints the XML tree that is rooted at the specified node to the system default OutputStream (stdout).

Demo Code


//package com.java2s;
import java.io.PrintStream;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

public class Main {
    /**// ww w.j  av a2  s .  com
     * Prints the XML tree that is rooted at the specified node to the system default
     * OutputStream (stdout).
     *
     * @param  n  The node that contains the XML tree that is to be printed out.
     * @pre    n != null
     */
    public static void printXMLTree(Node n) {
        printXMLTree(n, System.out);
    }

    /**
     * Prints the XML tree that is rooted at the specified node to the specified
     * PrintStream.
     *
     * @param  n    The node that contains the XML tree that is to be printed out.
     * @param  out  The PrintStream to which a dump of the XML tree is to be written.
     * @pre    n != null && out != null
     */
    public static void printXMLTree(Node n, PrintStream out) {
        printXMLNode(n, out);
        printXMLTreeRec(n, out, "");

    }

    /**
     * Prints a textual representation of the given node to the specified PrintStream.
     *
     * @param  n    Node that is to be printed.
     * @param  out  The PrintStream to which the node is to be printed.
     * @pre    n != null && out != null
     */
    public static void printXMLNode(Node n, PrintStream out) {
        switch (n.getNodeType()) {
        case Node.DOCUMENT_NODE:
            out.println("DOC_ROOT");
            break;

        case Node.ELEMENT_NODE:
            out.println("<" + ((Element) n).getTagName() + ">");
            break;

        case Node.ATTRIBUTE_NODE:
            out.println("@" + ((Attr) n).getName());
            break;

        case Node.TEXT_NODE:
            out.println("\"" + ((Text) n).getWholeText().trim() + "\"");
            break;

        case Node.COMMENT_NODE:
            out.println("COMMENT: \"" + n.getTextContent().trim() + "\"");
            break;

        default:
            out.println("Unknown node type: " + n.getNodeType());
        }
    }

    private static void printXMLTreeRec(Node n, PrintStream out, String pre) {
        final String NO_EDGE = "  ";
        final String STRAIGHT_EDGE = "? ";
        final String CHILD_EDGE = "??";
        final String LAST_CHILD_EDGE = "??";

        // Get node contents.
        NodeList children = n.getChildNodes();
        NamedNodeMap attributes = n.getAttributes();

        // Print attributes (if any).
        Node attr;
        if (attributes != null) {
            for (int index = 0; index < attributes.getLength(); index++) {
                attr = attributes.item(index);

                // Last child?
                if (index + 1 == children.getLength()
                        && children.getLength() == 0) {
                    out.print(pre + LAST_CHILD_EDGE);
                    printXMLNode(attr, out);
                    printXMLTreeRec(attr, out, pre + NO_EDGE);
                } else {
                    out.print(pre + CHILD_EDGE);
                    printXMLNode(attr, out);
                    printXMLTreeRec(attr, out, pre + STRAIGHT_EDGE);
                }
            }
        }

        // Print children.
        Node child;
        for (int index = 0; index < children.getLength(); index++) {
            child = children.item(index);

            // Last child?
            if (index + 1 == children.getLength()) {
                out.print(pre + LAST_CHILD_EDGE);
                printXMLNode(child, out);
                printXMLTreeRec(child, out, pre + NO_EDGE);
            } else {
                out.print(pre + CHILD_EDGE);
                printXMLNode(child, out);
                printXMLTreeRec(child, out, pre + STRAIGHT_EDGE);
            }
        }
    }
}

Related Tutorials