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// $Id$
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/**
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* Copyright (C) 2009 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.database.update;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.common.monitor.IProgressMonitor;
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import eu.etaxonomy.cdm.database.ICdmDataSource;
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/**
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* @author a.mueller
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* @date 16.09.2010
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*
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*/
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public class SortIndexUpdater extends SchemaUpdaterStepBase<SortIndexUpdater> implements ISchemaUpdaterStep {
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private static final Logger logger = Logger.getLogger(SortIndexUpdater.class);
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private final String tableName;
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private final String sortIndexColumn;
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private final String parentColumn;
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private String idColumn = "id";
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private final boolean includeAudTable;
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private Integer baseValue = 0;
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public static final SortIndexUpdater NewInstance(String stepName, String tableName, String parentColumn, String sortIndexColumn, boolean includeAudTable){
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return new SortIndexUpdater(stepName, tableName, parentColumn, sortIndexColumn, "id", includeAudTable, 0);
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}
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public static final SortIndexUpdater NewInstance(String stepName, String tableName, String parentColumn, String sortIndexColumn, String idColumn, boolean includeAudTable){
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return new SortIndexUpdater(stepName, tableName, parentColumn,sortIndexColumn, idColumn, includeAudTable, 0);
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}
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protected SortIndexUpdater(String stepName, String tableName, String parentColumn, String sortIndexColumn, String idColumn, boolean includeAudTable, Integer baseValue) {
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super(stepName);
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this.tableName = tableName;
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this.parentColumn = parentColumn;
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this.sortIndexColumn = sortIndexColumn;
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this.idColumn = idColumn;
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this.includeAudTable = includeAudTable;
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this.baseValue = baseValue;
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}
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@Override
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public Integer invoke(ICdmDataSource datasource, IProgressMonitor monitor, CaseType caseType) throws SQLException {
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boolean result = true;
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result &= addColumn(caseType.transformTo(tableName), datasource, monitor, caseType);
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if (includeAudTable){
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String aud = "_AUD";
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result &= addColumn(caseType.transformTo(tableName + aud), datasource, monitor, caseType);
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}
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return (result == true )? 0 : null;
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}
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private boolean addColumn(String tableName, ICdmDataSource datasource, IProgressMonitor monitor, CaseType caseType) throws SQLException {
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//Note: caseType not required here
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Map<Integer, Set<Integer>> indexMap = makeIndexMap(tableName, datasource);
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updateIndices(tableName, datasource, indexMap);
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return true;
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}
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/**
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* @param tableName
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* @param datasource
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* @param rs
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* @param index
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* @param oldParentId
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* @return
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* @throws SQLException
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*/
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private Map<Integer, Set<Integer>> makeIndexMap(String tableName, ICdmDataSource datasource) throws SQLException {
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String resulsetQuery = "SELECT @id as id, @parentColumn " +
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" FROM @tableName " +
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" WHERE @parentColumn IS NOT NULL " +
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" ORDER BY @parentColumn, @id";
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resulsetQuery = resulsetQuery.replace("@tableName", tableName);
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resulsetQuery = resulsetQuery.replace("@parentColumn", parentColumn);
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resulsetQuery = resulsetQuery.replace("@id", idColumn);
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ResultSet rs = datasource.executeQuery(resulsetQuery);
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Integer index = baseValue;
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int oldParentId = -1;
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//increase index with each row, set to 0 if parent is not the same as the previous one
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Map<Integer, Set<Integer>> indexMap = new HashMap<Integer, Set<Integer>>();
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while (rs.next() ){
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int id = rs.getInt("id");
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Object oParentId = rs.getObject(parentColumn);
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if (oParentId != null){
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int parentId = Integer.valueOf(oParentId.toString());
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if (oldParentId != parentId){
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index = baseValue;
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oldParentId = parentId;
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}else{
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index++;
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}
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putIndex(id, index, indexMap);
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}else{
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logger.warn("This should not happen");
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index = baseValue;
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}
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// System.out.println(oParentId + "," + id+","+ index+";");
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}
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return indexMap;
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}
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private void updateIndices(String tableName, ICdmDataSource datasource, Map<Integer, Set<Integer>> indexMap)
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throws SQLException {
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for (Integer index : indexMap.keySet()){
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Set<Integer> set = indexMap.get(index);
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String idSetString = makeIdSetString(set);
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String updateQuery = "UPDATE @tableName SET @sortIndexColumn = @index WHERE @id IN (@idList) ";
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updateQuery = updateQuery.replace("@tableName", tableName);
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updateQuery = updateQuery.replace("@sortIndexColumn", sortIndexColumn);
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updateQuery = updateQuery.replace("@index", index.toString());
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updateQuery = updateQuery.replace("@idList", idSetString);
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updateQuery = updateQuery.replace("@id", idColumn);
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datasource.executeUpdate(updateQuery);
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}
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}
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private static String makeIdSetString(Set<Integer> set) {
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StringBuffer result = new StringBuffer(set.size() * 5);
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for (Integer id:set){
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result.append(id + ",");
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}
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return result.substring(0, result.length() - 1);
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}
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/**
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* Adds the id to the index (each id is attached to an (sort)index)
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*/
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private void putIndex(Integer id, Integer index, Map<Integer, Set<Integer>> indexMap) {
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Set<Integer> set = indexMap.get(index);
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if (set == null){
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set = new HashSet<Integer>();
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indexMap.put(index, set);
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}
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set.add(id);
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}
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}
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