/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.server.service.restdml;
import static com.foundationdb.util.Strings.join;
import java.util.Arrays;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.foundationdb.ais.model.AkibanInformationSchema;
import com.foundationdb.ais.model.Column;
import com.foundationdb.ais.model.Table;
import com.foundationdb.ais.model.TableName;
import com.foundationdb.qp.operator.API;
import com.foundationdb.qp.operator.Operator;
import com.foundationdb.qp.operator.UpdateFunction;
import com.foundationdb.server.explain.Attributes;
import com.foundationdb.server.explain.CompoundExplainer;
import com.foundationdb.server.explain.ExplainContext;
import com.foundationdb.server.explain.Label;
import com.foundationdb.server.explain.PrimitiveExplainer;
import com.foundationdb.server.explain.Type;
import com.foundationdb.server.explain.format.DefaultFormatter;
import com.foundationdb.server.types.TCast;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.texpressions.TCastExpression;
import com.foundationdb.server.types.texpressions.TPreparedExpression;
import com.foundationdb.server.types.texpressions.TPreparedParameter;
public class UpdateGenerator extends OperatorGenerator {
private Table table;
private static final Logger logger = LoggerFactory.getLogger(UpdateGenerator.class);
public UpdateGenerator(AkibanInformationSchema ais) {
super(ais);
}
protected Operator create(TableName tableName, List<Column> upColumns) {
table = ais().getTable(tableName);
RowStream stream = new RowStream ();
stream.operator = indexAncestorLookup(tableName);
stream.rowType = schema().tableRowType(table);
TInstance varchar = getTypesTranslator().typeForString();
TPreparedExpression[] updates = new TPreparedExpression[table.getColumns().size()];
// The Primary Key columns have already been added as query parameters
// by the indexAncestorLookup ($1,,) So start the new parameters from there
// And we don't want to add the PK columns as to be updated.
List<Column> pkList = table.getPrimaryKey().getColumns();
int paramIndex = pkList.size();
int index = 0;
for (Column column : table.getColumns()) {
if (!pkList.contains(column) && upColumns.contains(column)) {
updates[index] = new TPreparedParameter(paramIndex, varchar);
if (!column.getType().equals(varchar)) {
TCast cast = registryService().getCastsResolver().cast(varchar.typeClass(),
column.getType().typeClass());
updates[index] = new TCastExpression(updates[index], cast, column.getType());
}
paramIndex++;
}
index++;
}
UpdateFunction updateFunction =
new UpsertRowUpdateFunction(Arrays.asList(updates), stream.rowType);
stream.operator = API.update_Returning(stream.operator, updateFunction);
if (logger.isDebugEnabled()) {
ExplainContext explain = explainUpdateStatement(stream.operator, table, Arrays.asList(updates));
DefaultFormatter formatter = new DefaultFormatter(table.getName().getSchemaName());
logger.debug("Update Plan for {}:\n{}", table,
join(formatter.format(stream.operator.getExplainer(explain))));
}
return stream.operator;
}
protected ExplainContext explainUpdateStatement(Operator plan, Table table, List<TPreparedExpression> updatesP) {
ExplainContext explainContext = new ExplainContext();
Attributes atts = new Attributes();
atts.put(Label.TABLE_SCHEMA, PrimitiveExplainer.getInstance(table.getName().getSchemaName()));
atts.put(Label.TABLE_NAME, PrimitiveExplainer.getInstance(table.getName().getTableName()));
for (Column column : table.getColumns()) {
if (updatesP.get(column.getPosition()) != null) {
atts.put(Label.COLUMN_NAME, PrimitiveExplainer.getInstance(column.getName()));
atts.put(Label.EXPRESSIONS, updatesP.get(column.getPosition()).getExplainer(explainContext));
}
}
explainContext.putExtraInfo(plan, new CompoundExplainer(Type.EXTRA_INFO, atts));
return explainContext;
}
}