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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: 2001-06-12 10:15:49 -0700 (Tue, 12 Jun 2001) $'
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* '$Revision: 779 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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import edu.ucsb.nceas.dbadapter.AbstractDatabase;
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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 static final AbstractDatabase dbAdapter = MetaCatUtil.dbAdapter;
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private Connection conn = null;
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private String sitecode = null;
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private String sep = null;
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private String docid = null;
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private String rev = 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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{
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// Open a connection to the database from here
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this((new MetaCatUtil()).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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{
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this.sitecode = MetaCatUtil.getOption("sitecode");
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this.sep = MetaCatUtil.getOption("accNumSeparator");
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this.conn = conn;
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}
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/** NEW - WHEN CLIENT ALWAYS PROVIDE ACCESSION NUMBER INCLUDING REV IN IT
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* Construct an AccessionNumber
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*
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* @param conn the db connection to read Accession number from
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* @param accnum the accession number to be checked for validness
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*/
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public AccessionNumber (Connection conn, String accnum, String action)
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throws AccessionNumberException, SQLException
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{
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this(conn);
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this.rev = null;
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this.docid = accnum;
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if ( accnum != null ) {
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int firstIndex = accnum.indexOf(this.sep);
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int lastIndex = accnum.lastIndexOf(this.sep);
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if ( firstIndex != lastIndex ) {
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//this docid contains a revision number
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this.rev = accnum.substring(lastIndex + 1);
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this.docid = accnum.substring(0, lastIndex);
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}
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}
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// INSERT
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if ( action.equals("INSERT")) {
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// check accession number for validness
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if ( docid == null ) {
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throw new AccessionNumberException("Accession number is required.");
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// rev is not provided; throw an exception to prevent the insertion
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} else if ( rev == null ) {
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throw new AccessionNumberException
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("Revision number is required and must be 1.");
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// docid is used; throw an exception to prevent the insertion
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} else if ( accNumberUsed(docid) ) {
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throw new AccessionNumberException
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("Accession number " + docid + " is already in use.");
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// rev is <> 1; throw an exception to prevent the insertion
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} else if ( !rev.equals("1") ) {
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throw new AccessionNumberException("Revision number must be 1.");
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}
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// UPDATE or DELETE
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} else if ( action.equals("UPDATE") || action.equals("DELETE")) {
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String l_rev = "";
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// Accession# is not provided; throw an exception to prevent the action
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if ( docid == null ) {
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throw new AccessionNumberException("Accession number is required.");
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// rev is not provided; throw an exception to prevent the action
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} else if ( rev == null ) {
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throw new AccessionNumberException
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("Revision number is required.");
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// Accession# is not current (not in xml_documents); throw an exception
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} else if ( !accNumberIsCurrent(docid) ) {
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throw new AccessionNumberException
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("Document not found for Accession number " + docid);
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// Revision number is not the recent one; throw an exception
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} else if ( action.equals("UPDATE") &&
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!rev.equals(l_rev = getNextRevision(docid)) ) {
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throw new AccessionNumberException
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("Next revision number must be "+ l_rev);
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// Revision number is not the recent one; throw an exception
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} else if ( action.equals("DELETE") &&
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!rev.equals(l_rev = getLastRevision(docid)) ) {
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throw new AccessionNumberException
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("Last revision number is "+ l_rev);
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}
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}
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}
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/**
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* Generate an Accession Number of form <sidecode>.<uniqueid>.<revisionid>
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* where <revisionid> is always 1.
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*
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* @param docid <sitecode>.<uniqueid> part of Accession Number
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* @param action INSERT, UPDATE or DELETE action
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*/
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public String generate(String docid, String action)
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throws AccessionNumberException, SQLException
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{
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return generate(docid, "1", action);
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}
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/**
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* Generate an Accession Number of form <sidecode>.<uniqueid>.<revisionid>
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*
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* @param docid <sitecode>.<uniqueid> part of Accession Number
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* @param rev <revisionid> of Accession Number
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* @param action INSERT, UPDATE or DELETE action
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*/
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public String generate(String docid, String rev, String action)
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throws AccessionNumberException, SQLException
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{
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try {
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// INSERT
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if ( action.equals("INSERT")) {
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// get a new docid
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if ( docid == null ) {
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String sitecode = getSitecode();
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String uniqueid = getUniqueID(sitecode);
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return sitecode + sep + uniqueid;
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// docid is used; throw an exception to prevent the insertion
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} else if ( accNumberUsed(docid) ) {
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throw new AccessionNumberException
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("Accession number " + docid + " is already in use.");
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// rev is <> 1; throw an exception to prevent the insertion
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} else if ( !rev.equals("1") ) {
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throw new AccessionNumberException
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("Revision number must be 1.");
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// docid is not used and rev=1; return it
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} else {
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return docid;
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}
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// UPDATE or DELETE
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} else if ( action.equals("UPDATE") || action.equals("DELETE")) {
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// Accession# is not provided; throw an exception to prevent the action
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if ( docid == null ) {
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throw new AccessionNumberException("Accession number is required.");
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// Accession# is not current (not in xml_documents); throw an exception
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} else if ( !accNumberIsCurrent(docid) ) {
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throw new AccessionNumberException
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("Document not found for Accession number " + docid);
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// Revision number is not the recent one; throw an exception
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} else if ( !rev.equals(getLastRevision(docid)) ) {
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throw new AccessionNumberException
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("Revision number must be the recent.");
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// Accession# is current (present in xml_documents); return it
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} else {
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return docid;
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}
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}
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} catch (SQLException e) {
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throw new SQLException
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("Error on AccessionNumber.generate(): " + e.getMessage());
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}
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// never comes here
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throw new
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AccessionNumberException("Fatal Error in accession number generation.");
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}
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// get local sitecode
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private String getSitecode()
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{
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return this.sitecode;
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}
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// get Unique ID from DB sequence
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private String getUniqueID (String sitecode) throws SQLException
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{
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String uniqueid;
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String sysdate = dbAdapter.getDateTimeFunction();
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement
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("INSERT INTO accession_number (site_code, date_created) " +
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"VALUES (?, " + sysdate + ")");
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pstmt.setString(1, sitecode);
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pstmt.execute();
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pstmt.close();
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uniqueid = "" + dbAdapter.getUniqueID(conn, "accession_number");
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} catch (SQLException e) {
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throw new
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SQLException("Error on AccessionNumber.getUniqueID(): "+e.getMessage());
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}
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return uniqueid;
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}
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/** check for existence of Accesssion Number xml_acc_numbers table */
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public boolean accNumberUsed ( String accNumber )
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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_documents " +
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"WHERE docid = ? " +
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"UNION " +
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"SELECT 'x' FROM xml_revisions " +
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"WHERE docid = ?");
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pstmt.setString(1,accNumber);
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pstmt.setString(2,accNumber);
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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(accNumber): " + 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 = ?");
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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 recent revision number for docid
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private String getLastRevision(String docid) throws SQLException
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{
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String rev = "";
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement
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("SELECT rev FROM xml_documents WHERE docid='" + docid + "'");
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pstmt.execute();
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ResultSet rs = pstmt.getResultSet();
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boolean hasRow = rs.next();
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rev = rs.getString(1);
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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.getLastRevision(): " + e.getMessage());
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}
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return rev;
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}
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// get the next revision number for docid
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private String getNextRevision(String docid) throws SQLException
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{
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String rev = "";
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement
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("SELECT rev+1 FROM xml_documents WHERE docid='" + docid + "'");
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pstmt.execute();
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ResultSet rs = pstmt.getResultSet();
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boolean hasRow = rs.next();
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rev = rs.getString(1);
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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.getNextRevision(): " + e.getMessage());
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}
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return rev;
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}
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/**
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* returns the docid encoded in this accession number
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*/
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public String getDocid() {
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return this.docid;
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}
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/**
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* returns the revision number encoded in this accession number
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*/
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public String getRev()
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{
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return this.rev;
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}
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}
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