Java tutorial
//package com.java2s; // This software is licensed in accordance with the terms of the 'Open Source import java.io.PrintStream; import java.io.PrintWriter; import org.w3c.dom.Attr; import org.w3c.dom.CDATASection; import org.w3c.dom.Comment; import org.w3c.dom.Document; import org.w3c.dom.DocumentType; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.Text; public class Main { /** * Recursively walks the DOM tree starting at the given <CODE>Node</CODE> * printing the gory details of its construction to <CODE>System.out</CODE>. * * @param node The <CODE>Node</CODE> to start the dump at. * @since TFP 1.0 */ public static void dump(final Node node) { doDump(System.out, node, 0); } /** * Recursively walks the DOM tree starting at the given <CODE>Node</CODE> * printing the gory details of its construction to the indicated * <CODE>PrintStream</CODE>. * * @param out The <CODE>PrintStream</CODE> for output. * @param node The <CODE>Node</CODE> to start the dump at. * @since TFP 1.0 */ public static void dump(PrintStream out, final Node node) { doDump(out, node, 0); out.flush(); } /** * Recursively walks the DOM tree starting at the given <CODE>Node</CODE> * printing the gory details of its construction to the indicated * <CODE>PrintWriter</CODE>. * * @param out The <CODE>PrintWriter</CODE> for output. * @param node The <CODE>Node</CODE> to start the dump at. * @since TFP 1.0 */ public static void dump(PrintWriter out, final Node node) { doDump(out, node, 0); out.flush(); } /** * Performs the actual recursive dumping of a DOM tree to a given * <CODE>PrintStream</CODE>. Note that dump is intended to be a detailed * debugging aid rather than pretty to look at. * * @param out The <CODE>PrintStream</CODE> to write to. * @param node The <CODE>Node</CODE> under consideration. * @param indent The level of indentation. * @see #dump(Node) * @see #dump(PrintStream, Node) * @since TFP 1.0 */ private static void doDump(PrintStream out, final Node node, int indent) { if (node != null) { for (int index = 0; index < indent; ++index) out.write(' '); switch (node.getNodeType()) { case Node.DOCUMENT_NODE: { Document document = (Document) node; out.println("DOCUMENT:"); doDump(out, document.getDoctype(), indent + 1); doDump(out, document.getDocumentElement(), indent + 1); break; } case Node.DOCUMENT_TYPE_NODE: { DocumentType type = (DocumentType) node; out.println("DOCTYPE: [" + "name=" + format(type.getName()) + "," + "publicId=" + format(type.getPublicId()) + "," + "systemId=" + format(type.getSystemId()) + "]"); break; } case Node.ELEMENT_NODE: { Element element = (Element) node; out.println("ELEMENT: [" + "ns=" + format(element.getNamespaceURI()) + "," + "name=" + format(element.getLocalName()) + "]"); NamedNodeMap attrs = element.getAttributes(); for (int index = 0; index < attrs.getLength(); ++index) doDump(out, attrs.item(index), indent + 1); for (Node child = element.getFirstChild(); child != null;) { doDump(out, child, indent + 1); child = child.getNextSibling(); } break; } case Node.ATTRIBUTE_NODE: { Attr attr = (Attr) node; out.println("ATTRIBUTE: [" + "ns=" + format(attr.getNamespaceURI()) + "," + "prefix=" + format(attr.getPrefix()) + "," + "name=" + format(attr.getLocalName()) + "," + "value=" + format(attr.getNodeValue()) + "]"); break; } case Node.TEXT_NODE: { Text text = (Text) node; out.println("TEXT: [" + format(text.getNodeValue()) + "]"); for (Node child = text.getFirstChild(); child != null;) { doDump(out, child, indent + 1); child = child.getNextSibling(); } break; } case Node.CDATA_SECTION_NODE: { CDATASection data = (CDATASection) node; out.println("CDATA: [" + format(data.getNodeValue()) + "]"); break; } case Node.COMMENT_NODE: { Comment comm = (Comment) node; out.println("COMMENT: [" + format(comm.getNodeValue()) + "]"); break; } default: out.println("UNKNOWN: [type=" + node.getNodeType() + "]"); break; } } } /** * Performs the actual recursive dumping of a DOM tree to a given * <CODE>PrintWriter</CODE>. Note that dump is intended to be a detailed * debugging aid rather than pretty to look at. * * @param out The <CODE>PrintWriter</CODE> to write to. * @param node The <CODE>Node</CODE> under consideration. * @param indent The level of indentation. * @see #dump(PrintWriter, Node) * @since TFP 1.0 */ private static void doDump(PrintWriter out, final Node node, int indent) { if (node != null) { for (int index = 0; index < indent; ++index) out.write(' '); switch (node.getNodeType()) { case Node.DOCUMENT_NODE: { Document document = (Document) node; out.println("DOCUMENT:"); doDump(out, document.getDoctype(), indent + 1); doDump(out, document.getDocumentElement(), indent + 1); break; } case Node.DOCUMENT_TYPE_NODE: { DocumentType type = (DocumentType) node; out.println("DOCTYPE: [" + "name=" + format(type.getName()) + "," + "publicId=" + format(type.getPublicId()) + "," + "systemId=" + format(type.getSystemId()) + "]"); break; } case Node.ELEMENT_NODE: { Element element = (Element) node; out.println("ELEMENT: [" + "ns=" + format(element.getNamespaceURI()) + "," + "name=" + format(element.getLocalName()) + "]"); NamedNodeMap attrs = element.getAttributes(); for (int index = 0; index < attrs.getLength(); ++index) doDump(out, attrs.item(index), indent + 1); for (Node child = element.getFirstChild(); child != null;) { doDump(out, child, indent + 1); child = child.getNextSibling(); } break; } case Node.ATTRIBUTE_NODE: { Attr attr = (Attr) node; out.println("ATTRIBUTE: [" + "ns=" + format(attr.getNamespaceURI()) + "," + "prefix=" + format(attr.getPrefix()) + "," + "name=" + format(attr.getLocalName()) + "," + "value=" + format(attr.getNodeValue()) + "]"); break; } case Node.TEXT_NODE: { Text text = (Text) node; out.println("TEXT: [" + format(text.getNodeValue()) + "]"); for (Node child = text.getFirstChild(); child != null;) { doDump(out, child, indent + 1); child = child.getNextSibling(); } break; } case Node.CDATA_SECTION_NODE: { CDATASection data = (CDATASection) node; out.println("CDATA: [" + format(data.getNodeValue()) + "]"); break; } case Node.COMMENT_NODE: { Comment comm = (Comment) node; out.println("COMMENT: [" + format(comm.getNodeValue()) + "]"); break; } default: out.println("UNKNOWN: [type=" + node.getNodeType() + "]"); break; } } } /** * Converts a <CODE>String</CODE> value to a displayable format for * debugging. This entails wrapping non-null strings with quotes and * replacing null strings with the word 'null'. * * @param value The <CODE>String</CODE> to be formatted. * @return The formatted <CODE>String</CODE> value. * @since TFP 1.0 */ private static String format(final String value) { if (value != null) return ("\"" + value + "\""); else return ("null"); } }