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/**
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* Name: DBValidate.java
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* Purpose: A Class that validates XML documents
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* This class is designed to be 'parser independent
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* i.e. it uses only org.xml.sax classes
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* It is tied to SAX 2.0 methods
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Dan Higgins
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*
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* Version: '$Id: DBValidate.java 185 2000-06-22 02:20:17Z jones $'
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*/
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package edu.ucsb.nceas.metacat;
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.util.*;
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import java.io.*;
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import java.lang.reflect.*;
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import org.w3c.dom.*;
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import org.xml.sax.*;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.XMLReaderFactory;
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import com.arbortext.catalog.*;
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/**
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* Name: DBValidate.java
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* Purpose: A Class that validates XML documents
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* This class is designed to be parser independent
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* i.e. it uses only org.xml.sax classes
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* It is tied to SAX 2.0 methods
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* April 28, 2000
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*
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* @author Dan Higgins
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* @version 1.0
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*/
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public class DBValidate {
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/** Default parser name. */
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private static final String
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DEFAULT_PARSER = "org.apache.xerces.parsers.SAXParser";
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static int WARNING = 0;
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static int ERROR=1;
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static int FATAL_ERROR=2;
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XMLReader parser;
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ErrorStorer ef;
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String xml_doc; // document to be parsed
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/** Construct a new validation object */
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public DBValidate(String parserName) {
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try {
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// Get an instance of the parser
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parser = XMLReaderFactory.createXMLReader(parserName);
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parser.setFeature("http://xml.org/sax/features/validation",true);
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//parser.setValidationMode(true); // Oracle
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} catch (Exception e) {
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System.err.println("Could not create parser!!!");
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}
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CatalogEntityResolver cer = new CatalogEntityResolver();
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try {
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Catalog myCatalog = new Catalog();
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myCatalog.loadSystemCatalogs();
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cer.setCatalog(myCatalog);
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} catch (Exception e) {System.out.println("Problem creating Catalog!");}
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parser.setEntityResolver(cer);
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}
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/** Construct a new validation object */
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public DBValidate(String parserName, String xmlcatalogfile) {
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try {
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// Get an instance of the parser
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parser = XMLReaderFactory.createXMLReader(parserName);
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parser.setFeature("http://xml.org/sax/features/validation",true);
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//parser.setValidationMode(true); // Oracle
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} catch (Exception e) {
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System.err.println("Could not create parser!!!");
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}
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CatalogEntityResolver cer = new CatalogEntityResolver();
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try {
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Catalog myCatalog = new Catalog();
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myCatalog.loadSystemCatalogs();
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myCatalog.parseCatalog(xmlcatalogfile);
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cer.setCatalog(myCatalog);
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} catch (Exception e) {System.out.println("Problem creating Catalog!");}
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parser.setEntityResolver(cer);
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}
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/**
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* validate an xml document against its DTD
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*
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* @param doc the filename of the document to validate
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*/
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public boolean validate(String doc) {
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xml_doc = doc;
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ef = new ErrorStorer();
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ef.resetErrors();
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parser.setErrorHandler(ef);
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try {
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parser.parse((createURL(xml_doc)).toString());
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} catch (IOException e) {
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System.out.println("IOException:Could not parse :"+xml_doc);
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ParseError eip = null;
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eip = new ParseError("",0,0,"",
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"IOException:Could not parse :"+xml_doc);
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if (ef.errorNodes == null) ef.errorNodes = new Vector();
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ef.errorNodes.addElement(eip);
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} catch (Exception e) {}
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// {System.out.println("Exception parsing:Could not parse :"+xml_doc);}
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if (ef != null && ef.getErrorNodes()!=null &&
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ef.getErrorNodes().size() > 0 ) {
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return false;
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} else {
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return true;
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}
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}
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/**
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* validate an xml document against its DTD
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*
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* @param xmldoc the String containing the xml document to validate
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*/
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public boolean validateString(String xmldoc) {
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// string is actual XML here, NOT URL or file name
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ef = new ErrorStorer();
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ef.resetErrors();
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parser.setErrorHandler(ef);
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InputSource is = new InputSource(new StringReader(xmldoc));
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try {
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parser.parse(is);
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}
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catch (Exception e) {System.out.println("Error in parsing!");}
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if (ef != null && ef.getErrorNodes()!=null &&
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ef.getErrorNodes().size() > 0 ) {
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return false;
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} else {
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return true;
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}
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}
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/** provide a list of errors fromthe validation process */
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public String returnErrors() {
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String errorstring = "";
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if (ef != null && ef.getErrorNodes()!=null &&
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ef.getErrorNodes().size() > 0 ) {
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Vector errors = ef.getErrorNodes();
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for (Enumeration e = errors.elements() ; e.hasMoreElements() ;) {
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errorstring = errorstring +
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((ParseError)(e.nextElement())).getMsg()+"\n";
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errorstring = errorstring + "----\n";
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}
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} else {
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errorstring = "No errors were detected!!!";
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}
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return errorstring;
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}
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/** Create a URL object from either a URL string or a plain file name. */
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private URL createURL(String name) throws Exception {
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try {
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URL u = new URL(name);
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return u;
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} catch (MalformedURLException ex) {
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}
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URL u = new URL("file:" + new File(name).getAbsolutePath());
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return u;
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}
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/**
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* main method for testing
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* <p>
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* Usage: java DBValidate <xmlfile or URL>
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*/
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public static void main(String[] args) {
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if (args.length != 1) {
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System.out.println("Usage: java DBValidate <xmlfile or URL>");
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System.exit(0);
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}
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String doc = args[0];
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DBValidate gxv = new DBValidate(DEFAULT_PARSER);
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if (gxv.validate(doc)) {
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System.out.println("XML is valid.");
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} else {
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System.out.print(gxv.returnErrors());
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}
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}
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/**
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* ErrorStorer has been revised here to simply create a Vector of
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* ParseError objects
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*
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*/
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class ErrorStorer implements ErrorHandler {
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//
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// Data
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//
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Vector errorNodes = null;
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/**
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* Constructor
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*/
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public ErrorStorer() {
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}
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/**
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* The client is is allowed to get a reference to the Hashtable,
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* and so could corrupt it, or add to it...
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*/
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public Vector getErrorNodes() {
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return errorNodes;
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}
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/**
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* The ParseError object for the node key is returned.
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* If the node doesn't have errors, null is returned.
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*/
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public Object getError() {
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if (errorNodes == null)
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return null;
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return errorNodes;
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}
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/**
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* Reset the error storage.
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*/
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public void resetErrors() {
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if (errorNodes != null)
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errorNodes.removeAllElements();
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}
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/***/
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public void warning(SAXParseException ex) {
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handleError(ex, WARNING);
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}
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public void error(SAXParseException ex) {
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handleError(ex, ERROR);
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}
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public void fatalError(SAXParseException ex) throws SAXException {
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handleError(ex, FATAL_ERROR);
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}
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private void handleError(SAXParseException ex, int type) {
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// System.out.println("!!! handleError: "+ex.getMessage());
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StringBuffer errorString = new StringBuffer();
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errorString.append("at line number, ");
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errorString.append(ex.getLineNumber());
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errorString.append(": ");
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errorString.append(ex.getMessage());
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if (errorNodes == null) {
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errorNodes = new Vector();
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}
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ParseError eip = null;
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eip = new ParseError(ex.getSystemId(),ex.getLineNumber(),
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ex.getColumnNumber(),"",errorString.toString());
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// put it in the Hashtable.
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errorNodes.addElement(eip);
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}
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}
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/**
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* The ParseError class wraps up all the error info from
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* the ErrorStorer's error method.
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*
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* @see ErrorStorer
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*/
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class ParseError extends Object {
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//
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// Data
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//
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String fileName;
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int lineNo;
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int charOffset;
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Object key;
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String msg;
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/**
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* Constructor
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*/
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public ParseError(String fileName, int lineNo, int charOffset,
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Object key, String msg) {
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this. fileName=fileName;
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this. lineNo=lineNo;
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this. charOffset=charOffset;
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this. key=key;
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this. msg=msg;
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}
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//
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// Getters...
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//
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public String getFileName() { return fileName; }
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public int getLineNo() { return lineNo; }
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public int getCharOffset() { return charOffset;}
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public Object getKey() { return key; }
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public String getMsg() { return msg; }
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public void setMsg(String s) { msg = s; }
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}
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}
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