AbstractOccurrenceAPI.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2021 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.occurrence;
 
import java.util.List;
import java.util.stream.Collectors;
import org.turro.jpa.Dao;
import org.turro.jpa.DaoTransaction;
 
public abstract class AbstractOccurrenceAPI<E> implements IOccurrenceAPI {
 
  private List<E> list;
 
  @Override
  public long getCount() {
    return list == null ? 0 : list.size();
  }
  
  @Override
  public boolean hasOccurrences(String value) {
    list = getOccurrences(value).stream()
            .filter(t -> getValue(t).equals(value)).collect(Collectors.toList());
    return getCount() != 0;
  }
 
  public List<E> getList() {
    return list;
  }
 
  @Override
  public void changeOccurrences(String newValue) {
    try(DaoTransaction transaction = new DaoTransaction(getDao())) {
      for(E e : getList()) {
        setValue(e, newValue);
        transaction.saveObject(e);
      }
    }
  }
  
  @Override
  public void removeOccurrences() {
    try(DaoTransaction transaction = new DaoTransaction(getDao())) {
      for(E e : getList()) {
        transaction.remove(e);
      }
    }
  }
  
  /* Dao */
  
  private Dao _dao;
  
  protected Dao getDao() {
    if(_dao == null) {
      _dao = createDao();
    }
    return _dao;
  }
  
  protected abstract Dao createDao();
  protected abstract List<E> getOccurrences(String value);
  protected abstract String getValue(E value);
  protected abstract void setValue(E value, String newValue);
  
}