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/**
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* '$RCSfile$'
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* Purpose: A class that gets Accession Number, check for uniqueness
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* and register it into db
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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, Matt Jones
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* Release: @release@
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*
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* '$Author: bojilova $'
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* '$Date: 2000-09-20 13:15:58 -0700 (Wed, 20 Sep 2000) $'
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* '$Revision: 459 $'
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*/
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package edu.ucsb.nceas.metacat;
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import java.net.*;
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import java.sql.*;
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/**
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* (on insert of XML document)
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* Generates a unique Accession Number or if provided check it
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* for uniqueness and register it into the db connection
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* (on update or delete of XML document)
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* Check for existance of provided Accession Number
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*
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*/
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public class AccessionNumber {
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private Connection conn = null;
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private String defaultGlobalName = null;
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private String sep = null;
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/**
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* Construct an AccessionNumber
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*/
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public AccessionNumber ()
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throws SQLException, ClassNotFoundException {
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MetaCatUtil util = new MetaCatUtil();
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this.defaultGlobalName = util.getOption("defaultGlobalName");
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this.sep = util.getOption("accNumberSeparator");
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// Open a connection to the database
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this.conn = util.openDBConnection();
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}
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/**
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* Construct an AccessionNumber
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*
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* @param conn the db connection to read from and write Accession# to
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*/
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public AccessionNumber (Connection conn) {
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MetaCatUtil util = new MetaCatUtil();
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this.defaultGlobalName = util.getOption("defaultGlobalName");
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this.sep = util.getOption("accNumberSeparator");
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this.conn = conn;
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}
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/**
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* Get an Accession Number, check it for uniqueness and
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* register it into db connection. If no Accession Number is
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* provided, generate one from the database and return it.
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*
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* @param accNumber - Accession # if provided or null if not
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* @param action - INSERT, UPDATE or DELETE.
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* When "INSERT" and accession # provided is not unique, get new one.
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* If it is unique, use it.
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* When "INSERT" and accession # is null, get a new one.
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* When "UPDATE", accession # is required and it is checked for existance.
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* When "DELETE", accession # is required and it is checked for existance.
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*/
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public String generate (String accNumber, String action)
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throws AccessionNumberException, SQLException {
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String globalName = null;
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String localId = null;
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try {
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conn.setAutoCommit(true);
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// split the acc # in 2 parts - global name & local id
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if ( accNumber != null ) {
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globalName = getGlobalName(accNumber, sep);
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localId = getLocalId(accNumber, sep);
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}
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// register unique acc #
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if ( action.equals("INSERT")) {
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if ( accNumber == null )
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return put(defaultGlobalName, null, sep);
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else
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return put(globalName, localId, sep);
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} else if ( action.equals("UPDATE") || action.equals("DELETE")) {
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if ( accNumber == null ) {
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throw (new AccessionNumberException("Accession number is " +
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"required."));
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} else if (!accNumberIsCurrent(accNumber)) {
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throw (new AccessionNumberException("Document " +
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"not found for accession #: " + accNumber));
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} else {
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return (globalName + sep + localId);
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}
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}
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//conn.close();
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} catch (StringIndexOutOfBoundsException siobe) {
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MetaCatUtil.debugMessage(
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"Error on AccessionNumber.generate(): " +
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siobe.getMessage());
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throw (new AccessionNumberException("Accession number invalid, " +
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"expecting character \'" + sep + "'."));
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} catch (SQLException e) {
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throw new SQLException(
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"Error on AccessionNumber.generate(accNumber, action): " +
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e.getMessage());
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}
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throw (new AccessionNumberException("Fatal Error in " +
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"accession number generation: "));
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}
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/** put unique accession # into db connection */
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private String put (String globalName, String localId, String sep)
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throws SQLException
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{
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Integer l = null;
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try {
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if ( localId == null )
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l = new Integer(get(globalName) + 1);
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else if ( accNumberUsed(globalName, localId) )
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l = new Integer(get(globalName) + 1);
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else
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l = new Integer(localId);
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// insert globalName & l
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_acc_numbers (global_name, local_id) " +
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"VALUES (?, ?)");
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pstmt.setString(1,globalName);
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pstmt.setString(2,l.toString());
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pstmt.execute();
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pstmt.close();
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} catch (SQLException e) {
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throw new SQLException(
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"Error on AccessionNumber.put(globalName, localId, sep): "
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+ e.getMessage());
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}
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return globalName + sep + l;
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}
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/** check for existence of Accesssion Number xml_acc_numbers table */
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private boolean accNumberUsed(String globalName, String localId)
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throws SQLException {
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boolean hasAccNumber = false;
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement(
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"SELECT 'x' FROM xml_acc_numbers " +
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"WHERE global_name LIKE ? AND local_id = ?");
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pstmt.setString(1,globalName);
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pstmt.setString(2,localId);
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pstmt.execute();
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ResultSet rs = pstmt.getResultSet();
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hasAccNumber = rs.next();
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pstmt.close();
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} catch (SQLException e) {
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throw new SQLException(
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"Error on AccessionNumber.accNumberUsed(globalName, " +
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"localId): " + e.getMessage());
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}
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return hasAccNumber;
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}
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/** check for existence of Accesssion Number in xml_documents table */
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private boolean accNumberIsCurrent(String accNumber) throws SQLException {
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boolean hasCurrentAccNumber = false;
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement(
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"SELECT 'x' FROM xml_documents " +
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"WHERE docid LIKE ?");
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pstmt.setString(1, accNumber);
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pstmt.execute();
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ResultSet rs = pstmt.getResultSet();
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hasCurrentAccNumber = rs.next();
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pstmt.close();
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} catch (SQLException e) {
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throw new SQLException(
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"Error on AccessionNumber.accNumberIsCurrent(String accNumber): " +
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e.getMessage());
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}
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return hasCurrentAccNumber;
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}
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/** get the last in order local ID by a given global name */
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private int get (String globalName) throws SQLException {
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement(
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"SELECT max(local_id) FROM xml_acc_numbers " +
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"WHERE global_name LIKE ?");
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pstmt.setString(1,globalName);
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pstmt.execute();
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ResultSet rs = pstmt.getResultSet();
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boolean hasLocalId = rs.next();
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if (hasLocalId) {
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return rs.getInt(1);
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}
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pstmt.close();
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} catch (SQLException e) {
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throw new SQLException(
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"Error on AccessionNumber.get(globalName): " + e.getMessage());
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}
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return 0;
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}
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// get the global part of the accession number
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private String getGlobalName (String accNumber, String sep)
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throws StringIndexOutOfBoundsException {
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return accNumber.substring(0, accNumber.lastIndexOf(sep));
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}
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// get the local part of the accession number
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private String getLocalId (String accNumber, String sep)
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throws StringIndexOutOfBoundsException {
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return accNumber.substring(accNumber.lastIndexOf(sep)+1);
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}
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}
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/**
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* '$Log$
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* 'Revision 1.12 2000/08/30 18:19:41 bojilova
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* 'cleared static methods in AccessionNumber classes for fixing bug found
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* 'when multiple requests to the servlet at a time.
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* '
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* 'Revision 1.11 2000/08/14 20:53:33 jones
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* 'Added "release" keyword to all metacat source files so that the release
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* 'number will be evident in software distributions.
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* '
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* 'Revision 1.10 2000/06/27 04:31:07 jones
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* 'Fixed bugs associated with the new UPDATE and DELETE functions of
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* 'DBWriter. There were problematic interactions between some static
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* 'variables used in DBEntityResolver and the way in which the
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* 'Servlet objects are re-used across multiple client invocations.
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* '
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* 'Generally cleaned up error reporting. Now all errors and success
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* 'results are reported as XML documents from MetaCatServlet. Need
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* 'to make the command line tools do the same.
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* '
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* 'Revision 1.9 2000/06/26 10:35:04 jones
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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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* 'Revision 1.8.2.5 2000/06/26 08:38:01 jones
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* 'Added DELETE feature to DBWriter. Now takes an action "DELETE" and a
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* 'docid and will move the record from the xml_documents table to the
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* 'xml_revisions table.
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* 'Modified option parsing to support option symbols on command line.
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* '
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* 'Revision 1.8.2.4 2000/06/25 23:11:40 jones
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* 'Documentation update
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* '
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* 'Revision 1.8.2.3 2000/06/25 23:08:31 jones
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* 'Minor change to excpetion handling
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* ''
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*/
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