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/**
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* '$RCSfile$'
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* Purpose: A Class that transforms an XML text document
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* into a another type using XSL
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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: Matt Jones
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* Release: @release@
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*
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* '$Author: tao $'
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* '$Date: 2002-02-26 14:02:05 -0800 (Tue, 26 Feb 2002) $'
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* '$Revision: 950 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.sql.*;
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import java.util.Stack;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.stream.StreamSource;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.TransformerConfigurationException;
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import org.apache.xerces.parsers.DOMParser;
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import org.w3c.dom.Attr;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.Document;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.DocumentType;
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import org.xml.sax.SAXException;
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import org.xml.sax.InputSource;
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import org.apache.xerces.dom.DocumentTypeImpl;
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import org.apache.xpath.XPathAPI;
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import org.w3c.dom.NamedNodeMap;
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/*
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import oracle.xml.parser.v2.XSLStylesheet;
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import oracle.xml.parser.v2.XSLException;
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import oracle.xml.parser.v2.XMLParseException;
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import oracle.xml.parser.v2.XSLProcessor;
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import oracle.xml.parser.v2.XMLDocument;
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import oracle.xml.parser.v2.DOMParser;
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*/
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import org.w3c.dom.Document;
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import org.w3c.dom.Node;
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import org.w3c.dom.Element;
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import org.xml.sax.SAXException;
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/**
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* A Class that transforms XML documents utitlizing XSL style sheets
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*/
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public class DBTransform {
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private Connection conn = null;
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private MetaCatUtil util = null;
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private String configDir = null;
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private String defaultStyle = null;
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/**
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* construct a DBTransform instance.
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*
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* Generally, one calls transformXMLDocument() after constructing the instance
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*
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* @param conn the database connection from which to lookup the public ids
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*/
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public DBTransform( Connection conn )
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throws IOException,
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SQLException,
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ClassNotFoundException
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{
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this.conn = conn;
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util = new MetaCatUtil();
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configDir = util.getOption("config-dir");
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defaultStyle = util.getOption("default-style");
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}
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/**
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* Transform an XML document using the stylesheet reference from the db
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*
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* @param doc the document to be transformed
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* @param sourcetype the document type of the source
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* @param targettype the target document type
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* @param qformat the name of the style set to use
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* @param pw the PrintWriter to which output is printed
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*/
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public void transformXMLDocument(String doc, String sourceType,
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String targetType, String qformat, PrintWriter pw) {
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// Look up the stylesheet for this type combination
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String xslSystemId = getStyleSystemId(qformat, sourceType, targetType);
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if (xslSystemId != null) {
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// Create a stylesheet from the system id that was found
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try {
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TransformerFactory tFactory = TransformerFactory.newInstance();
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Transformer transformer = tFactory.newTransformer(
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new StreamSource(xslSystemId));
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transformer.setParameter("qformat", qformat);
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transformer.transform(new StreamSource(new StringReader(doc)),
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new StreamResult(pw));
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} catch (Exception e) {
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pw.println(xslSystemId + "Error transforming document in " +
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"DBTransform.transformXMLDocument: " +
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e.getMessage());
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}
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} else {
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// No stylesheet registered form this document type, so just return the
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// XML stream we were passed
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pw.print(doc);
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}
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}
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/**
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* Transform an XML document to StringWriter using the stylesheet reference
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* from the db
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* @param doc the document to be transformed
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* @param sourceType the document type of the source
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* @param targetType the target document type
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* @param qFormat the name of the style set to use
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* @param pw the StringWriter to which output will be stored
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*/
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public void transformXMLDocument(String doc, String sourceType,
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String targetType, String qFormat, StringWriter pw) {
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// Look up the stylesheet for this type combination
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String xslSystemId = getStyleSystemId(qFormat, sourceType, targetType);
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if (xslSystemId != null) {
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// Create a stylesheet from the system id that was found
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try {
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TransformerFactory tFactory = TransformerFactory.newInstance();
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Transformer transformer = tFactory.newTransformer(
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new StreamSource(xslSystemId));
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transformer.setParameter("qFormat", qFormat);
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transformer.transform(new StreamSource(new StringReader(doc)),
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new StreamResult(pw));
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} catch (Exception e) {
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util.debugMessage(xslSystemId + "Error transforming document in " +
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"DBTransform.transformXMLDocument: " +
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e.getMessage());
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}
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} else {
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// No stylesheet registered form this document type, so just return the
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// XML stream we were passed
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pw.write(doc);
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}
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}
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/**
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* gets the content of a tag in a given xml file with the given path
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* @param f the file to parse
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* @param path the path to get the content from
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*/
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public static NodeList getPathContent(File f, String path)
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{
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if(f == null)
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{
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return null;
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}
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DOMParser parser = new DOMParser();
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InputSource in;
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FileInputStream fs;
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try
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{
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fs = new FileInputStream(f);
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in = new InputSource(fs);
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}
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catch(FileNotFoundException fnf)
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{
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fnf.printStackTrace();
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return null;
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}
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try
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{
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parser.parse(in);
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fs.close();
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}
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catch(Exception e1)
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{
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System.err.println("File: " + f.getPath() + " : parse threw: " +
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e1.toString());
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return null;
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}
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Document doc = parser.getDocument();
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try
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{
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NodeList docNodeList = XPathAPI.selectNodeList(doc, path);
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return docNodeList;
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}
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catch(Exception se)
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{
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System.err.println("file: " + f.getPath() + " : parse threw: " +
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se.toString());
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return null;
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}
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}
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/**
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* Lookup a stylesheet reference from the db catalog
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*
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* @param qformat the named style-set format
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* @param sourcetype the document type of the source
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* @param targettype the document type of the target
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*/
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public String getStyleSystemId(String qformat, String sourcetype,
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String targettype) {
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String systemId = null;
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if ((qformat == null) || (qformat.equals("html"))) {
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qformat = defaultStyle;
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}
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// Load the style-set map for this qformat into a DOM
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try {
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boolean breakflag = false;
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String filename = configDir + "/" + qformat + ".xml";
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util.debugMessage("Trying style-set file: " + filename);
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File f = new File(filename);
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NodeList nlDoctype = getPathContent(f, "/style-set/doctype");
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NodeList nlDefault = getPathContent(f, "/style-set/default-style");
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Node nDefault = nlDefault.item(0);
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systemId = nDefault.getFirstChild().getNodeValue(); //set the default
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for(int i=0; i<nlDoctype.getLength(); i++)
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{ //look for the right sourcetype
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Node nDoctype = nlDoctype.item(i);
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NamedNodeMap atts = nDoctype.getAttributes();
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Node nAtt = atts.getNamedItem("publicid");
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String doctype = nAtt.getFirstChild().getNodeValue();
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if(doctype.equals(sourcetype))
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{ //found the right sourcetype now we need to get the target type
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NodeList nlChildren = nDoctype.getChildNodes();
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for(int j=0; j<nlChildren.getLength(); j++)
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{
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Node nChild = nlChildren.item(j);
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String childName = nChild.getNodeName();
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if(childName.equals("target"))
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{
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NamedNodeMap childAtts = nChild.getAttributes();
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Node nTargetPublicId = childAtts.getNamedItem("publicid");
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String target = nTargetPublicId.getFirstChild().getNodeValue();
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if(target.equals(targettype))
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{ //we found the right target type
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NodeList nlTarget = nChild.getChildNodes();
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for(int k=0; k<nlTarget.getLength(); k++)
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{
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Node nChildText = nlTarget.item(k);
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if(nChildText.getNodeType() == Node.TEXT_NODE)
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{ //get the text from the target node
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systemId = nChildText.getNodeValue();
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breakflag = true;
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break;
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}
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}
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}
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}
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if(breakflag)
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{
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break;
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}
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}
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}
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if(breakflag)
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{
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break;
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}
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}
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}
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catch(Exception e)
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{
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System.out.println("Error parsing style-set file: " + e.getMessage());
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e.printStackTrace();
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}
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// Return the system ID for this particular source document type
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return systemId;
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}
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/**
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* Lookup a stylesheet reference from the db catalog
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*
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* @param objecttype the type of the object we want to retrieve
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* @param sourcetype the document type of the source
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* @param targettype the document type of the target
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*/
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public String getSystemId(String objecttype, String sourcetype,
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String targettype) {
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// Look up the System ID of a particular object
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PreparedStatement pstmt;
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String the_system_id = null;
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try {
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pstmt =
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conn.prepareStatement("SELECT system_id " +
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"FROM xml_catalog " +
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"WHERE entry_type = ? " +
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"AND source_doctype = ? " +
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"AND target_doctype = ? ");
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// Bind the values to the query
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pstmt.setString(1, objecttype);
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pstmt.setString(2, sourcetype);
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pstmt.setString(3, targettype);
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pstmt.execute();
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try {
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ResultSet rs = pstmt.getResultSet();
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try {
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boolean tableHasRows = rs.next();
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if (tableHasRows) {
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try {
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the_system_id = rs.getString(1);
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} catch (SQLException e) {
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System.out.println("Error with getString in " +
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"DBTransform.getSystemId: " + e.getMessage());
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}
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} else {
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the_system_id = null;
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}
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} catch (SQLException e) {
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System.err.println("Error with next in DBTransform.getSystemId: " +
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e.getMessage());
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return ("Error with next: " + e.getMessage());
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}
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} catch (SQLException e) {
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System.err.println("Error with getrset in DBTransform.getSystemId: " +
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e.getMessage());
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return ("Error with getrset: " + e.getMessage());
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}
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pstmt.close();
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} catch (SQLException e) {
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System.err.println("Error getting id in DBTransform.getSystemId: " +
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e.getMessage());
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return ("Error getting id in DBTransform.getSystemId:: " +
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e.getMessage());
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}
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return the_system_id;
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}
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/**
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* the main routine used to test the transform utility.
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*
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* Usage: java DBTransform
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*/
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static public void main(String[] args) {
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if (args.length > 0)
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{
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java DBTransform");
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return;
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} else {
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try {
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// Open a connection to the database
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MetaCatUtil util = new MetaCatUtil();
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Connection dbconn = util.openDBConnection();
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// Create a test document
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StringBuffer testdoc = new StringBuffer();
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testdoc.append("<?xml version=\"1.0\"?>");
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testdoc.append("<eml-dataset><metafile_id>NCEAS-0001</metafile_id>");
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testdoc.append("<dataset_id>DS001</dataset_id>");
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testdoc.append("<title>My test doc</title></eml-dataset>");
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// Transform the document to the new doctype
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DBTransform dbt = new DBTransform(dbconn);
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dbt.transformXMLDocument(testdoc.toString(),
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"-//NCEAS//eml-dataset//EN",
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"-//W3C//HTML//EN",
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"knb",
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new PrintWriter(System.out));
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402
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} catch (Exception e) {
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System.err.println("EXCEPTION HANDLING REQUIRED");
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System.err.println(e.getMessage());
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e.printStackTrace(System.err);
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}
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}
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}
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410
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private void dbg(int position) {
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System.err.println("Debug flag: " + position);
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}
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414
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|
415
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}
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