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/**
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* '$RCSfile$'
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* Purpose: A Class that implements org.xml.sax.EntityResolver interface
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* for resolving external entities
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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: Jivka Bojilova
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*/
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package edu.ucsb.nceas.metacat;
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import org.xml.sax.*;
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import java.sql.*;
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import java.net.URL;
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import java.net.URLConnection;
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import java.net.MalformedURLException;
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import java.io.IOException;
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import java.util.Stack;
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import java.util.EmptyStackException;
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/**
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* A database aware Class implementing EntityResolver interface for the SAX
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* parser to call when processing the XML stream and intercepting any
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* external entities (including the external DTD subset and external
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* parameter entities, if any) before including them.
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*/
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public class DBEntityResolver implements EntityResolver
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{
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private Connection conn = null;
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private DBSAXHandler handler;
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/** Construct an instance of the DBEntityResolver clas
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*
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* @param conn the JDBC connection to which information is written
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*/
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public DBEntityResolver(Connection conn, DBSAXHandler handler)
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{
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this.conn = conn;
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this.handler = handler;
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}
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/**
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* The Parser call this method before opening any external entity
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* except the top-level document entity (including the external DTD subset,
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* external entities referenced within the DTD, and external entities
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* referenced within the document element)
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*/
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public InputSource resolveEntity (String publicId, String systemId)
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throws MalformedURLException, IOException
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{
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String dbSystemId;
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String doctype = null;
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// Only process entities if its the DTD
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if (handler.atFirstElement()) {
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if (publicId != null) { // If we have a public ID, use it
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doctype = publicId;
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MetaCatUtil.debugMessage("DOCTYPE-c: " + doctype);
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} else if ( systemId != null) { // Otherwise, use system id if we can
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doctype = handler.getDocname();
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MetaCatUtil.debugMessage("DOCTYPE-d: " + doctype);
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}
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// look at the db XML Catalog and get dbSystemId for this doctype
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dbSystemId = getDTDSystemID (conn, doctype);
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if (dbSystemId == "") {
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// if it is not found inthe database, then
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// register publicId in db and use the provided systemId
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if (systemId != "") {
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checkURLConnection(systemId);
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registerDTDSystemID (conn, doctype, doctype, systemId);
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return null;
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}
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} else {
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// If it is in the database, return the systemid fromthe database
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checkURLConnection(dbSystemId);
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return new InputSource(dbSystemId);
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}
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}
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// use the default behaviour for other cases
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checkURLConnection(systemId);
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return null;
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}
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/**
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* Look at db XML Catalog to get System ID (if any) for that doctype.
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* Return empty string if there are not
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*/
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private String getDTDSystemID (Connection conn, String doctype) {
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String system_id = "";
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Statement stmt;
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try {
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stmt = conn.createStatement();
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stmt.execute("SELECT system_id FROM xml_catalog " +
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"WHERE entry_type = 'DTD' AND public_id = '" +
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doctype + "'");
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try {
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ResultSet rs = stmt.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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system_id = rs.getString(1);
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} catch (SQLException e) {
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System.out.println("DBEntityResolver.getDTDSystemID() " +
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"- Error with getString: " + e.getMessage());
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}
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}
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} catch (SQLException e) {
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System.out.println("DBEntityResolver.getDTDSystemID() " +
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"- Error with next: " + e.getMessage());
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}
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} catch (SQLException e) {
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System.out.println("DBEntityResolver.getDTDSystemID() " +
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"- Error with getrset: " + e.getMessage());
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}
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stmt.close();
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} catch (SQLException e) {
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jones
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System.out.println("DBEntityResolver.getDTDSystemID() " +
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"- Error getting id: " + e.getMessage());
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System.exit(1);
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}
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// return the selected System ID
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return system_id;
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}
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jones
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/**
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* Register DTD System ID in db XML Catalog
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*/
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private void registerDTDSystemID (Connection conn, String doctype,
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String publicId, String systemId)
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{
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_catalog " +
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"(catalog_id, entry_type, source_doctype, " +
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"public_id, system_id) " +
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bojilova
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"VALUES (null, 'DTD', ?, ?, ?)");
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bojilova
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// Bind the values to the query
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bojilova
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pstmt.setString(1, doctype);
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pstmt.setString(2, publicId);
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pstmt.setString(3, systemId);
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bojilova
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// Do the insertion
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pstmt.execute();
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pstmt.close();
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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}
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122
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jones
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/**
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151
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bojilova
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* Check URL Connection for systemId
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122
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jones
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*/
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151
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bojilova
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private void checkURLConnection (String systemId)
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throws MalformedURLException, IOException
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72
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bojilova
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{
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try {
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151
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bojilova
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URLConnection urlConn = (new URL(systemId)).openConnection();
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urlConn.connect();
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} catch (MalformedURLException e) {
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System.out.println("from checkURLConnection(): " + e.getMessage());
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throw e;
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} catch (IOException e) {
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System.out.println("from checkURLConnection(): " + e.getMessage());
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throw e;
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}
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}
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72
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bojilova
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}
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203
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jones
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/**
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| 177 |
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* '$Log$
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204
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jones
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* 'Revision 1.11 2000/06/26 10:35:04 jones
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| 179 |
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* 'Merged in substantial changes to DBWriter and associated classes and to
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* 'the MetaCatServlet in order to accomodate the new UPDATE and DELETE
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* 'functions. The command line tools and the parameters for the
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* 'servlet have changed substantially.
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* '
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203
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jones
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* 'Revision 1.10.2.2 2000/06/25 23:38:16 jones
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* 'Added RCSfile keyword
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* '
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* 'Revision 1.10.2.1 2000/06/25 23:34:17 jones
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* 'Changed documentation formatting, added log entries at bottom of source files
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* ''
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| 190 |
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*/
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