/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.metamodel.query;
import java.util.Date;
import org.apache.metamodel.data.Row;
import org.apache.metamodel.schema.ColumnType;
import org.apache.metamodel.util.TimeComparator;
public class ToDateFunction extends DefaultScalarFunction {
private static final long serialVersionUID = 1L;
@Override
public ColumnType getExpectedColumnType(ColumnType type) {
if (type.isTimeBased()) {
return type;
}
return ColumnType.TIMESTAMP;
}
@Override
public String getFunctionName() {
return "TO_DATE";
}
@Override
public Object evaluate(Row row, Object[] parameters, SelectItem item) {
final Object value = row.getValue(item);
if (value == null || value instanceof Date) {
return value;
}
return TimeComparator.toDate(value);
}
}