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'jdbacl' stands for 'Java DataBase ACcess Layer' and provides utilities for accessing JDBC databases from
Java programs, retrieving meta information in an object model and querying database data.
'rapiddweller jdbacl' is forked from Databene jdbacl by Volker Bergmann.
/*
* (c) Copyright 2010-2011 by Volker Bergmann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted under the terms of the
* GNU General Public License (GPL).
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
* REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
* HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.rapiddweller.jdbacl.identity;
import com.rapiddweller.common.ConfigurationError;
import com.rapiddweller.jdbacl.SQLUtil;
import com.rapiddweller.jdbacl.model.DBForeignKeyConstraint;
import com.rapiddweller.jdbacl.model.DBRow;
import com.rapiddweller.jdbacl.model.DBTable;
/**
* Simple implementation of a transcoding mechanism.
* Created: 08.12.2010 18:45:49
*
* @author Volker Bergmann
* @since 0.6.4
*/
public class SimpleTranscoder {
/**
* Transcode.
*
* @param row the row
* @param nk the nk
* @param newPK the new pk
* @param sourceDbId the source db id
* @param identityProvider the identity provider
* @param mapper the mapper
*/
public static void transcode(DBRow row, String nk, Object newPK, String sourceDbId, IdentityProvider identityProvider, KeyMapper mapper) {
DBTable table = row.getTable();
String tableName = table.getName();
IdentityModel identity = identityProvider.getIdentity(tableName);
if (identity == null) {
throw new ConfigurationError("No identity defined for table " + tableName);
}
// transcode primary key
mapper.store("s", identity, nk, row.getPKValue(), newPK);
row.setPKValue(newPK);
// transcode references
for (DBForeignKeyConstraint fk : table.getForeignKeyConstraints()) {
String refereeTable = fk.getRefereeTable().getName();
Object sourceRef = row.getFKValue(fk);
if (sourceRef != null) {
IdentityModel sourceTable = identityProvider.getIdentity(refereeTable);
String sourceRefNK = mapper.getNaturalKey(sourceDbId, sourceTable, sourceRef);
Object targetRef = mapper.getTargetPK(sourceTable, sourceRefNK);
if (targetRef == null) {
String message = "No mapping found for " + sourceDbId + '.' + refereeTable + "#" + sourceRef +
" referred in " + table.getName() + SQLUtil.renderColumnNames(fk.getColumnNames()) + ". " +
"Probably has not been in the result set of the former '" + refereeTable + "' nk query.";
throw new RuntimeException(message);
}
row.setFKValue(fk, targetRef);
}
}
}
/* TODO v1.0 use this for merging
@Override
public void merge(Connection source, Connection target, int pageSize,
KeyMapper mapper, Context context) {
String activity = "Merging " + name + " from " + source.getId() + " to " + target.getId();
startActivity(activity);
// iterate owners
TypedIterable ownerEntities = source.queryEntities(ownerTableName, null, context);
Iterator ownerIterator = ownerEntities.iterator();
while (ownerIterator.hasNext()) {
Entity ownerEntity = ownerIterator.next();
Object ownerId = ownerEntity.idComponentValues();
String ownerNK = mapper.getNaturalKey(source, getOwnerTable(), ownerId);
// iterate subset
String sql = subNkPkQuery.replace("?", String.valueOf(ownerId)); // TODO v1.1 use prep stmt & handle composite keys
TypedIterable ownedEntities = source.queryRows(sql, context);
Iterator ownedIterator = ownedEntities.iterator();
while (ownedIterator.hasNext()) {
Object[] ownedNkPkRow = ownedIterator.next();
Entity ownedEntity = source.queryEntityById(name, extractPK(ownedNkPkRow));
Object sourceId = ownedEntity.idComponentValues();
if (ownerNK != null) {
String nk = ownerNK + '|' + String.valueOf(ownedNkPkRow[0]);
Object targetId = mapper.getTargetPK(this, nk);
if (targetId == null) {
handleNKNotFound(nk, name, source, target);
continue;
} else {
Entity targetEntity = target.queryEntityById(name, targetId);
String message = checkEquivalence(ownedEntity, targetEntity, source, nk, mapper);
if (message != null) {
handleNonEquivalence(message, source.getId(), ownedEntity);
} else
count++;
}
mapper.store(source, this, nk, sourceId, targetId);
if (count % pageSize == 0)
target.flush();
} else {
handleMissingOwner(name, ownedEntity, ownerTableName, ownerId, source);
}
}
IOUtil.close((Closeable) ownedIterator);
}
IOUtil.close((Closeable) ownerIterator);
target.flush();
endActivity(activity, source.countEntities(name));
}
protected String checkEquivalence(DBRow sourceEntity, DBRow targetEntity, String sourceDbId, String nk, KeyMapper mapper) {
sourceEntity = mapper.transcode(sourceEntity, table, sourceDbId, module);
if (sourceEntity == null)
return null;
StringBuilder message = new StringBuilder();
for (String columnName : NameUtil.getNames(table.getColumns())) {
if (irrelevantColumns.contains(columnName) || pkColumns.contains(columnName))
continue;
Object sourceValue = sourceEntity.getCellValue(columnName);
Object targetValue = targetEntity.getCellValue(columnName);
if (!equals(sourceValue, targetValue)) {
if (message.length() == 0)
message.append("Inconsistent columns: ");
else
message.append(", ");
message.append(table.getName() + '[' + nk + "]." + columnName + " " +
sourceDbId + ':' + sourceValue + ", target:" + targetValue);
}
}
return (message.length() > 0 ? message.toString() : null);
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private boolean equals(Object o1, Object o2) {
if (o1 == null)
return o2 == null;
else if (o2 == null)
return false;
else if (o1 instanceof Comparable) // this is needed since for BigDecimals 1 != 1.0
return ((Comparable) o1).compareTo(o2) == 0;
else
return o1.equals(o2);
}
*/
}