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/**
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 *        Name: DBSAXWriter.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: DBSAXWriter.java 74 2000-05-05 00:37:58Z jones $'
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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 DBSAXWriter {
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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 DBSAXWriter utility.
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   *
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   * Usage: java DBSAXWriter <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 DBSAXWriter " +
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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 DBSAXWriter(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 DBSAXWriter( 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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        parser.parse(xml);
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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 DBSAXWriter( 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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       parser.parse(xmlfile);
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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("here is the URL exception");
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       System.err.println(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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     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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  }
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}
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