/*
 * 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.jdo.sql;

import javax.annotation.Nullable;
import javax.jdo.PersistenceManager;

import com.querydsl.core.DefaultQueryMetadata;
import com.querydsl.core.QueryMetadata;
import com.querydsl.core.Tuple;
import com.querydsl.core.types.Expression;
import com.querydsl.sql.Configuration;
import com.querydsl.sql.SQLQuery;
import com.querydsl.sql.SQLSerializer;
import com.querydsl.sql.SQLTemplates;

/**
 * {@code JDOSQLQuery} is a {@link SQLQuery} implementation that uses JDO's SQL query functionality
 * to execute queries
 *
 * @author tiwe
 *
 * @param <T> result type
 *
 */
public final class JDOSQLQuery<T> extends AbstractSQLQuery<T, JDOSQLQuery<T>> {

    public JDOSQLQuery(@Nullable PersistenceManager persistenceManager, SQLTemplates templates) {
        this(persistenceManager, new Configuration(templates), new DefaultQueryMetadata(), false);
    }

    public JDOSQLQuery(@Nullable PersistenceManager persistenceManager, Configuration configuration) {
        this(persistenceManager, configuration, new DefaultQueryMetadata(), false);
    }

    public JDOSQLQuery(
            @Nullable PersistenceManager persistenceManager,
            Configuration configuration,
            QueryMetadata metadata, boolean detach) {
        super(metadata, configuration, persistenceManager, detach);
    }

    @Override
    public JDOSQLQuery<T> clone() {
        JDOSQLQuery<T> query = new JDOSQLQuery<T>(persistenceManager, configuration, getMetadata().clone(), detach);
        query.clone(this);
        return query;
    }

    @Override
    protected SQLSerializer createSerializer() {
        return new SQLSerializer(configuration);
    }

    @Override
    public <U> JDOSQLQuery<U> select(Expression<U> expr) {
        queryMixin.setProjection(expr);
        @SuppressWarnings("unchecked") // This is the new type
        JDOSQLQuery<U> newType = (JDOSQLQuery<U>) this;
        return newType;
    }

    @Override
    public JDOSQLQuery<Tuple> select(Expression<?>... exprs) {
        queryMixin.setProjection(exprs);
        @SuppressWarnings("unchecked") // This is the new type
        JDOSQLQuery<Tuple> newType = (JDOSQLQuery<Tuple>) this;
        return newType;
    }
}