Subtask.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 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.dossier.task;
 
import java.util.Date;
import org.turro.dossier.entity.Issue;
import org.turro.dossier.entity.IssuePredecessor;
import org.turro.dossier.entity.IssuePredecessorType;
import org.turro.elephant.util.Toasts;
import org.turro.jpa.Dao;
 
public class Subtask {
 
  private final Issue main;
  private final IssuePredecessorType type;
 
  public Subtask(Issue main, IssuePredecessorType type) {
    this.main = main;
    this.type = type;
  }
 
  public IssuePredecessor save(Dao dao, Issue task) {
    IssuePredecessor predecessor = new IssuePredecessor();
    predecessor.setSource(task);
    predecessor.setTarget(main);
    predecessor.setType(type);
    predecessor.setCreation(new Date());
    if(checkRelation(predecessor)) {
      return dao.saveObject(predecessor);
    } else {
      Toasts.message("Invalid relation").show();
      return null;
    }
  }
  
  private boolean checkRelation(IssuePredecessor ip) {
    if(ip.getSource() != null && ip.getTarget() != null) {
      if(ip.getSource().getId().equals(ip.getTarget().getId())) {
        return false;
      }
      if(!ip.getSource().getId().equals(main.getId()) && followUp(ip.getSource())) {
        return false;
      }
      if(!ip.getTarget().getId().equals(main.getId()) && followDown(ip.getTarget())) {
        return false;
      }
      return true;
    }
    return false;
  }
 
  private boolean followUp(Issue source) {
    for(IssuePredecessor ip : source.getSources()) {
      if(ip.getSource().getId().equals(main.getId())) {
        return true;
      } else {
        followUp(ip.getSource());
      }
    }
    return false;
  }
 
  private boolean followDown(Issue target) {
    for(IssuePredecessor ip : target.getTargets()) {
      if(ip.getTarget().getId().equals(main.getId())) {
        return true;
      } else {
        followUp(ip.getTarget());
      }
    }
    return false;
  }
  
}