com.querydsl.jpa.FactoryExpressionTransformer Maven / Gradle / Ivy
/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* Licensed 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 com.querydsl.jpa;
import java.util.List;
import org.hibernate.transform.ResultTransformer;
import com.querydsl.core.types.FactoryExpression;
/**
* {@code FactoryExpressionTransformer} is a ResultTransformer implementation using
* FactoryExpression instances for transformation
*
* @author tiwe
*
*/
public final class FactoryExpressionTransformer implements ResultTransformer {
private static final long serialVersionUID = -3625957233853100239L;
private final transient FactoryExpression projection;
public FactoryExpressionTransformer(FactoryExpression projection) {
this.projection = projection;
}
@Override
public List transformList(List collection) {
return collection;
}
@Override
public Object transformTuple(Object[] tuple, String[] aliases) {
if (projection.getArgs().size() < tuple.length) {
Object[] shortened = new Object[projection.getArgs().size()];
System.arraycopy(tuple, 0, shortened, 0, shortened.length);
tuple = shortened;
}
return projection.newInstance(tuple);
}
}