JpaSubquery.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 javax.persistence.criteria.Path;
import javax.persistence.criteria.Subquery;
 
public class JpaSubquery<E> extends AbstractJpaQuery<E> {
  
  protected JpaSubquery(Class<E> javaClass, Subquery subquery) {
    super(javaClass);
    query = subquery;
  }
 
  @Override
  public JpaSubquery<E> select() {
    ((Subquery<E>) query).select(root().root());
    return this;
  }
  
  @Override
  public JpaSubquery<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]);
      }               
    }
    ((Subquery<E>) query).select(selection);
    return this;
  }
  
}