466 lines
14 KiB
Java
466 lines
14 KiB
Java
/************************************************************************
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: XmlDiff.java,v $
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*
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* $Revision: 1.2 $
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*
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* last change: $Author: rt $ $Date: 2005-09-09 11:50:18 $
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*
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* The Contents of this file are made available subject to
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* the terms of GNU Lesser General Public License Version 2.1.
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*
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2005 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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************************************************************************/
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import java.io.FileWriter;
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import java.io.InputStream;
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import java.io.FileInputStream;
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import java.io.BufferedInputStream;
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import java.io.BufferedWriter;
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import java.io.IOException;
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import java.io.FileNotFoundException;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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import java.io.PrintWriter;
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import java.util.Vector;
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import java.util.Properties;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.ParserConfigurationException;
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import org.w3c.dom.Node;
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import org.w3c.dom.Document;
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import org.w3c.dom.NodeList;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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/**
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* This class will diff 2 Xml files.
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*
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* @author Stephen Mak
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*/
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public final class XmlDiff {
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private static final String PROPSFILE = "XmlDiff.properties";
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private static final String FILE1 = "XmlDiff.file1";
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private static final String FILE2 = "XmlDiff.file2";
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private static final String OUTPUT= "XmlDiff.output";
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private static final String IGNORE_TAGS= "XmlDiff.tags";
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private Properties props_ = null;
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private static PrintWriter writer_ = null;
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private String[] tags_ = null;
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private String file1_ = null;
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private String file2_ = null;
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/**
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* Constructor. Load the properties file.
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*/
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public XmlDiff() throws IOException {
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Class c = this.getClass();
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InputStream is = c.getResourceAsStream(PROPSFILE);
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BufferedInputStream bis = new BufferedInputStream(is);
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props_ = new Properties();
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props_.load(bis);
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bis.close();
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String file1 = props_.getProperty(FILE1, "");
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String file2 = props_.getProperty(FILE2, "");
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String tagsString = props_.getProperty(IGNORE_TAGS, "");
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String output = props_.getProperty("debug.output", "System.out");
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setOutput(output);
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tags_ = parseTags(tagsString);
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}
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/**
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* diff 2 xml, but overwrite the property file's file1/2 setting with
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* the input argument
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*/
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public boolean diff(String file1, String file2) throws IOException {
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file1_ = file1;
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file2_ = file2;
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return diff();
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}
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public boolean diff() throws IOException {
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boolean result = false;
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writer_.println("parsing "+ file1_ + "...");
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// parse the Xml file
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Document doc1 = parseXml(file1_);
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writer_.println("parsing "+ file1_ + "...");
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Document doc2 = parseXml(file2_);
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if (doc1 != null && doc2 != null) {
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writer_.println("diffing "+ file1_ + " & " + file2_ + "...");
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result = compareNode(doc1, doc2);
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}
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return result;
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}
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private void diffLog(String errMsg, Node node1, Node node2) {
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String node1Str = "";
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String node2Str = "";
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if (node1 != null) {
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node1Str = "[Type]:" + nodeInfo(node1) +
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" [Name]:" + node1.getNodeName();
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if (node1.getNodeValue() != null)
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node1Str += " [Value]:" + node1.getNodeValue();
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}
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if (node2 != null) {
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node2Str = "[Type]:" + nodeInfo(node2) +
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" [Name]:" + node2.getNodeName();
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if (node2.getNodeValue() != null)
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node2Str += " [Value]:" + node2.getNodeValue();
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}
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writer_.println(errMsg);
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writer_.println(" Node1 - " + node1Str);
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writer_.println(" Node2 - " + node2Str);
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}
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private String nodeInfo(Node node) {
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String str = null;
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switch (node.getNodeType()) {
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case Node.ELEMENT_NODE:
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str = "ELEMENT";
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break;
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case Node.ATTRIBUTE_NODE:
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str = "ATTRIBUTE";
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break;
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case Node.TEXT_NODE:
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str = "TEXT";
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break;
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case Node.CDATA_SECTION_NODE:
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str = "CDATA_SECTION";
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break;
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case Node.ENTITY_REFERENCE_NODE:
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str = "ENTITY_REFERENCE";
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break;
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case Node.ENTITY_NODE:
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str = "ENTITY";
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break;
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case Node.PROCESSING_INSTRUCTION_NODE:
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str = "PROCESSING_INSTRUCTION";
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break;
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case Node.COMMENT_NODE:
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str = "COMMENT";
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break;
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case Node.DOCUMENT_NODE:
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str = "DOCUMENT";
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break;
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case Node.DOCUMENT_TYPE_NODE:
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str = "DOCUMENT_TYPE";
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break;
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case Node.DOCUMENT_FRAGMENT_NODE:
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str = "DOCUMENT_FRAGMENT";
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break;
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case Node.NOTATION_NODE:
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str = "NOTATION";
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break;
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}
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return str;
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}
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private boolean ignoreTag(String nodeName) {
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if (tags_ != null) {
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for (int i = 0; i < tags_.length; i++) {
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if (tags_[i].equals(nodeName))
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return true;
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}
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}
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return false;
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}
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// for future use if we want to compare attributes
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private boolean attributesEqual(Node node1, Node node2) {
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return true;
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}
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private boolean compareNode(Node node1, Node node2) {
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boolean equal = false;
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while (true) {
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if (node1 == null && node2 == null) {
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equal = true;
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break;
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} else if (node1 == null || node2 == null) {
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diffLog("DIFF: one of the node is null", node1, node2);
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break;
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}
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if (node1.getNodeType() != node2.getNodeType()) {
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diffLog("DIFF: nodetype is different", node1, node2);
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break;
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}
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if (node1.getNodeName() == null && node2.getNodeName() == null) {
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// empty
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} else if (node1.getNodeName() == null ||
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node2.getNodeName() == null) {
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diffLog("DIFF: one of the nodeName is null", node1, node2);
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break;
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} else if (!node1.getNodeName().equals(node2.getNodeName())) {
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diffLog("DIFF: nodeName is different", node1, node2);
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break;
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}
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if (ignoreTag(node1.getNodeName())) {
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diffLog("DIFF: Some tag(s) is ignored", node1, node2);
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equal = true;
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break;
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}
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if (node1.getNodeValue() == null && node2.getNodeValue() == null) {
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// empty
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} else if (node1.getNodeValue() == null ||
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node2.getNodeValue() == null) {
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diffLog("DIFF: one of the nodevalue is null", node1, node2);
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break;
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} else if (!node1.getNodeValue().equals(node2.getNodeValue())) {
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diffLog("DIFF: nodeValue is different", node1, node2);
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break;
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}
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// try to compare attributes if necessary
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if (!attributesEqual(node1, node2))
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break;
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NodeList node1Children = node1.getChildNodes();
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NodeList node2Children = node2.getChildNodes();
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// number of children have to be the same
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if (node1Children == null && node2Children == null) {
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equal = true;
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break;
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}
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if (node1Children == null || node2Children == null) {
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diffLog("DIFF: one node's children is null", node1, node2);
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break;
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}
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if (node1Children.getLength() != node2Children.getLength()) {
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diffLog("DIFF: num of children is different", node1, node2);
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break;
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}
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// compare all the childrens
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equal = true;
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for (int i = 0; i < node1Children.getLength(); i++) {
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if (!compareNode(node1Children.item(i),
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node2Children.item(i))) {
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equal = false;
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break;
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}
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}
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break;
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}
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return equal;
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}
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private Document parseXml (String filename) throws IOException {
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Document w3cDocument = null;
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FileInputStream fis;
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try {
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fis = new FileInputStream(filename);
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} catch (FileNotFoundException ex) {
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ex.printStackTrace(writer_);
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writer_.println(ex.getMessage());
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return w3cDocument;
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}
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/** factory for DocumentBuilder objects */
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DocumentBuilderFactory factory = null;
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factory = DocumentBuilderFactory.newInstance();
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factory.setNamespaceAware(true);
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factory.setValidating(false);
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/** DocumentBuilder object */
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DocumentBuilder builder = null;
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try {
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builder = factory.newDocumentBuilder();
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} catch (ParserConfigurationException ex) {
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ex.printStackTrace(writer_);
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writer_.println(ex.getMessage());
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return null;
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}
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builder.setErrorHandler(
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new org.xml.sax.ErrorHandler() {
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// ignore fatal errors (an exception is guaranteed)
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public void fatalError(SAXParseException e)
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throws SAXException {
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throw e;
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}
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public void error(SAXParseException e)
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throws SAXParseException {
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// make sure validation error is thrown.
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throw e;
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}
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public void warning(SAXParseException e)
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throws SAXParseException {
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}
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}
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);
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try {
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w3cDocument = builder.parse(fis);
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w3cDocument.getDocumentElement().normalize();
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} catch (SAXException ex) {
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ex.printStackTrace(writer_);
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writer_.println(ex.getMessage());
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return w3cDocument;
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}
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return w3cDocument;
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}
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private String [] parseTags(String tagsString) {
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Vector tagsVector = new Vector();
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if (tagsString.length() == 0)
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return null;
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int start = 0;
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int end = 0;
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// break the tag string into a vector of strings by words
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for (end = tagsString.indexOf(" ", start);
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end != -1 ;
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start = end + 1, end = tagsString.indexOf(" ", start)) {
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tagsVector.add(tagsString.substring(start,end));
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}
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tagsVector.add(tagsString.substring(start,tagsString.length()));
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// convert the vector to array
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String[] tags= new String[tagsVector.size()];
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tagsVector.copyInto(tags);
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return tags;
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}
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/**
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* Set the output to the specified argument.
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* This method is only used internally to prevent
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* invalid string parameter.
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*
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* @param str output specifier
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*/
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private static void setOutput(String str) {
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if (writer_ == null) {
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if (str.equals("System.out")) {
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setOutput(System.out);
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} else if (str.equals("System.err")) {
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setOutput(System.err);
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} else {
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try {
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setOutput(new FileWriter(str));
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} catch (IOException e) {
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e.printStackTrace(System.err);
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}
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}
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}
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}
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/**
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* Set the output to an OutputStream object.
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*
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* @param stream OutputStream object
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*/
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private static void setOutput(OutputStream stream) {
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setOutput(new OutputStreamWriter(stream));
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}
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/**
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* Set the Writer object to manage the output.
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*
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* @param w Writer object to write out
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*/
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private static void setOutput(Writer w) {
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if (writer_ != null) {
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writer_.close();
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}
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writer_ = new PrintWriter(new BufferedWriter(w), true);
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}
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public static void main(String args[]) throws IOException {
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if (args.length != 0 && args.length != 2) {
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System.out.println("Usage: XmlDiff [<file1> <file2>].");
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return;
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}
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XmlDiff xmldiff = new XmlDiff();
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boolean same = false;
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if (args.length == 2) {
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same = xmldiff.diff(args[0], args[1]);
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} else {
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same = xmldiff.diff();
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}
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System.out.println("Diff result: " + same);
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}
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}
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