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/**
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* Name: DBWriter.java
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* Purpose: A Class that reads in an XML text document and
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* write its contents to a database connection using SAX
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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: '$Id$'
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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.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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// Extensions to the SAX Interfaces for Namespace support.
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import oracle.xml.parser.v2.XMLDocumentHandler;
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import oracle.xml.parser.v2.DefaultXMLDocumentHandler;
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import oracle.xml.parser.v2.NSName;
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import oracle.xml.parser.v2.SAXAttrList;
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import oracle.xml.parser.v2.SAXParser;
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/**
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* A Class that reads in an XML text document and
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* write its contents to a database connection using SAX
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*/
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public class DBWriter {
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static String defaultDB = "jdbc:oracle:thin:@penelope.nceas.ucsb.edu:1526:DEV8";
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private Connection conn = null;
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/**
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* the main routine used to test the DBWriter utility.
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*
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* Usage: java DBWriter <filename> <user> <password> [dbstring]
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*
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* @param filename the filename to be loaded into the database
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* @param user the username to use for the database connection
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* @param password the password to use for the database connection
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* @param dbstring the connection info to use for the database connection
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*/
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static public void main(String[] args) {
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if (args.length < 3)
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{
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java DBWriter " +
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"<filename> <user> <password> [dbstring]");
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return;
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} else {
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try {
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String filename = args[0];
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String user = args[1];
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String password = args[2];
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String dbstring = null;
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if (args.length <= 3) {
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dbstring = defaultDB;
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} else {
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dbstring = args[3];
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}
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// Open a connection to the database
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Connection dbconn = MetaCatUtil.openDBConnection(
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"oracle.jdbc.driver.OracleDriver",
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dbstring, user, password);
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new DBWriter(filename, dbconn);
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System.out.println("Document processing finished for: " + filename);
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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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/**
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* construct a new instance of the class to write an XML file to the database
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*
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* @param filename the filename to be loaded into the database
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* @param conn the database connection to which to write the XML file
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*/
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public DBWriter( Reader xml, 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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try {
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SAXParser parser = initializeParser(conn);
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conn.setAutoCommit(false);
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parser.parse(xml);
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conn.commit();
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conn.setAutoCommit(true);
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} catch (SAXParseException e) {
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System.err.println(e.getMessage());
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} catch (SAXException e) {
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System.err.println(e.getMessage());
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} catch (Exception e) {
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System.err.println(e.toString());
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}
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}
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public DBWriter( String filename, 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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FileReader xmlfile = new FileReader(new File(filename).toString());
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try {
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SAXParser parser = initializeParser(conn);
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conn.setAutoCommit(false);
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parser.parse(xmlfile);
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conn.commit();
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conn.setAutoCommit(true);
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} catch (SAXParseException e) {
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System.err.println(e.getMessage());
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} catch (SAXException e) {
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System.err.println(e.getMessage());
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} catch (Exception e) {
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System.err.println("from DBWriter:" + e.toString());
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}
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}
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private SAXParser initializeParser(Connection conn) {
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SAXParser parser = null;
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//
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// Set up the SAX document handlers for parsing
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//
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try {
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// Use the XMLDocumentHandler interface for namespace support
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// instead of org.xml.sax.DocumentHandler
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XMLDocumentHandler xmlDocHandler = new DBSAXHandler(conn);
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EntityResolver xmlEntityResolver = new DBEntityResolver(conn);
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DTDHandler xmlDTDHandler = new DBDTDHandler(conn);
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// For all the other interface use the default provided by
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// Handler base
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HandlerBase defHandler = new HandlerBase();
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// Get an instance of the parser
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parser = new SAXParser();
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// Set Handlers in the parser
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// Set the DocumentHandler to XMLDocumentHandler
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parser.setDocumentHandler(xmlDocHandler);
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parser.setEntityResolver(xmlEntityResolver);
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parser.setDTDHandler(xmlDTDHandler);
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// Set the other Handler to the defHandler
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parser.setErrorHandler(defHandler);
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} catch (Exception e) {
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System.err.println(e.toString());
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}
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return parser;
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}
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/** Utility method to convert a file handle into a URL */
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static public URL fileToURL(File file)
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{
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16
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String path = file.getAbsolutePath();
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String fSep = System.getProperty("file.separator");
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if (fSep != null && fSep.length() == 1)
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path = path.replace(fSep.charAt(0), '/');
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if (path.length() > 0 && path.charAt(0) != '/')
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path = '/' + path;
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try {
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return new URL("file", null, path);
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}
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catch (java.net.MalformedURLException e) {
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/* According to the spec this could only happen if the file
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protocol were not recognized. */
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throw new Error("unexpected MalformedURLException");
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}
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15
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}
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}
|