AbstractJpaQuery.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2020 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.jpa.query;
 
import java.util.List;
import javax.persistence.criteria.AbstractQuery;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Predicate;
 
public abstract class AbstractJpaQuery<E> {
 
  protected final Class<E> persistentClass;
  protected AbstractQuery<E> query;
  protected JpaRoot root;
 
  public AbstractJpaQuery(Class<E> persistentClass) {
    this.persistentClass = persistentClass;
  }
  
  public JpaRoot<E> root() {
    if(root == null) {
      root = new JpaRoot<>(query.from(persistentClass));
    }
    return root;
  }
  
  public <T> JpaRoot<T> root(Class<T> javaClass) {
    return new JpaRoot<>(query.from(javaClass));
  }
  
  public CriteriaQuery<E> query() {
    return (CriteriaQuery<E>) query;
  }
  
  public abstract AbstractJpaQuery<E> select();  
  public abstract AbstractJpaQuery<E> select(String... columns);
 
  public AbstractJpaQuery<E> where(Expression<Boolean> restriction) {
    query.where(restriction);
    return this;
  }
 
  public AbstractJpaQuery<E> where(Predicate... restrictions) {
    query.where(restrictions);
    return this;
  }
  
  public AbstractJpaQuery<E> groupBy(Expression<?>... grouping) {
    query.groupBy(grouping);
    return this;
  }
 
  public AbstractJpaQuery<E> groupBy(List<Expression<?>> grouping) {
    query.groupBy(grouping);
    return this;
  }
 
  public AbstractJpaQuery<E> having(Expression<Boolean> restriction) {
    query.having(restriction);
    return this;
  }
 
  public AbstractJpaQuery<E> having(Predicate... restrictions) {
    query.having(restrictions);
    return this;
  }
 
  public AbstractJpaQuery<E> distinct(boolean distinct) {
    query.distinct(distinct);
    return this;
  }
  
}