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JPA support for Querydsl

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/*
 * 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);
    }

}