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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.jdo;

import javax.inject.Provider;
import javax.jdo.PersistenceManager;

import com.querydsl.core.QueryFactory;
import com.querydsl.core.Tuple;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.jdo.dml.JDODeleteClause;

/**
 * Factory class for query and DML clause creation
 *
 * @author tiwe
 *
 */
public class JDOQueryFactory implements QueryFactory> {

    private final Provider persistenceManager;

    public JDOQueryFactory(Provider persistenceManager) {
        this.persistenceManager = persistenceManager;
    }

    public JDODeleteClause delete(EntityPath path) {
        return new JDODeleteClause(persistenceManager.get(), path);
    }

    /**
     * Create a new {@link JDOQuery} instance with the given projection
     *
     * @param expr projection
     * @param 
     * @return select(expr)
     */
    public  JDOQuery select(Expression expr) {
        return query().select(expr);
    }

    /**
     * Create a new {@link JDOQuery} instance with the given projection
     *
     * @param exprs projection
     * @return select(exprs)
     */
    public JDOQuery select(Expression... exprs) {
        return query().select(exprs);
    }

    /**
     * Create a new {@link JDOQuery} instance with the given projection
     *
     * @param expr projection
     * @param 
     * @return select(distinct expr)
     */
    public  JDOQuery selectDistinct(Expression expr) {
        return query().select(expr).distinct();
    }

    /**
     * Create a new {@link JDOQuery} instance with the given projection
     *
     * @param exprs projection
     * @return select(distinct exprs)
     */
    public JDOQuery selectDistinct(Expression... exprs) {
        return query().select(exprs).distinct();
    }

    /**
     * Create a new {@link JDOQuery} instance with the projection 0
     *
     * @return select(0)
     */
    public JDOQuery selectZero() {
        return select(Expressions.ZERO);
    }

    /**
     * Create a new {@link JDOQuery} instance with the projection 1
     *
     * @return select(1)
     */
    public JDOQuery selectOne() {
        return select(Expressions.ONE);
    }

    /**
     * Create a new {@link JDOQuery} instance with the given projection
     *
     * @param expr projection and source
     * @param 
     * @return select(expr).from(expr)
     */
    public  JDOQuery selectFrom(EntityPath expr) {
        return select(expr).from(expr);
    }

    public JDOQuery from(EntityPath from) {
        return query().from(from);
    }

    @Override
    public JDOQuery query() {
        return new JDOQuery(persistenceManager.get());
    }


}