JpaQuery.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.CriteriaQuery;
import javax.persistence.criteria.Order;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Selection;
 
public class JpaQuery<E> extends AbstractJpaQuery<E> {
 
  private final JpaCriteria jpaCriteria;
  
  protected JpaQuery(Class<E> javaClass, JpaCriteria jpaCriteria) {
    super(javaClass);
    this.jpaCriteria = jpaCriteria;
    initQuery();
  }
  
  @Override
  public JpaQuery<E> select() {
    ((CriteriaQuery<E>) query).select(root().root());
    return this;
  }
  
  @Override
  public JpaQuery<E> select(String... columns) {
    Path selection = null;
    for(int i = 0; i < columns.length; i++) {
      if(i == 0) {
        selection = root().get(columns[i]);
      } else if(selection != null) {
        selection = selection.get(columns[i]);
      }               
    }
    ((CriteriaQuery<E>) query).select(selection);
    return this;
  }
  
  public JpaQuery<E> select(Selection<? extends E> selection) {
    ((CriteriaQuery<E>) query).select(selection);
    return this;
  }
 
  public JpaQuery<E> multiselect(Selection<?>... selections) {
    ((CriteriaQuery<E>) query).multiselect(selections);
    return this;
  }
 
  public JpaQuery<E> multiselect(List<Selection<?>> selectionList) {
    ((CriteriaQuery<E>) query).multiselect(selectionList);
    return this;
  }
 
  public JpaQuery<E> orderBy(Order... o) {
    ((CriteriaQuery<E>) query).orderBy(o);
    return this;
  }
 
  public JpaQuery<E> orderBy(List o) {
    ((CriteriaQuery<E>) query).orderBy(o);
    return this;
  }
  
  public <T> JpaSubquery<T> subquery(Class<T> javaClass) {
    return new JpaSubquery<>(javaClass, query.subquery(persistentClass));
  }
 
  private void initQuery() {
    query = jpaCriteria.builder().createQuery(persistentClass);
  }
 
}