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/**
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* Name: DBTransform.java
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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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*
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* Version: '$Id: DBTransform.java 94 2000-05-12 20:26:27Z jones $'
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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 oracle.xml.parser.v2.XSLStylesheet;
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import oracle.xml.parser.v2.XSLException;
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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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* 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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/**
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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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}
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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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*/
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public void transformXMLDocument(String doc, String sourcetype,
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String targettype, PrintWriter pw) {
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// Look up the stylesheet for this type combination
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String xsl_system_id = getSystemId("XSL", sourcetype, targettype);
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if (xsl_system_id != null) {
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// Create a stylesheet from the system id that was found
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try {
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XSLStylesheet style = new XSLStylesheet(new URL(xsl_system_id), null);
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DOMParser dp = new DOMParser();
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dp.setValidationMode(false);
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dp.parse((Reader)(new StringReader(doc)));
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new XSLProcessor().processXSL(style, dp.getDocument(), pw);
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} catch (Exception e) {
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pw.println(xsl_system_id + "Error transforming document:\n" +
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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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* 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 entity_type LIKE ? " +
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"AND source_doctype LIKE ? " +
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"AND target_doctype LIKE ? ");
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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: " + e.getMessage()); }
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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.out.println("Error with next: " + 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.out.println("Error with getrset: " + 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.out.println("Error getting id: " + e.getMessage());
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return ("Error getting id: " + 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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