TaskFilter.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 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.erp.task;
 
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import javax.persistence.Query;
import org.turro.string.Strings;
import org.turro.elephant.db.WhereClause;
import org.turro.erp.db.ErpPU;
import org.turro.erp.entity.Task;
import org.turro.jpa.Dao;
import org.turro.plugin.filter.IFilterValue;
import org.turro.zkoss.grid.GroupExtended;
import org.zkoss.zul.Grid;
import org.zkoss.zul.Group;
 
public class TaskFilter {
 
  private long lastId = 0;
 
  public TaskFilter() {
  }
 
  public Collection<Task> getTasks(List<IFilterValue> values) {
    lastId = 0;
    Dao dao = new ErpPU();
    try {
      WhereClause wc = createCriteria(values);
      if(!Strings.isEmpty(wc.getClause())) {
        Query q = dao.createQuery(wc.getClause());
        wc.setNamedParameters(q);
        return q.getResultList();
      } else {
        return Collections.EMPTY_LIST;
      }
    } finally {
      dao.close();
    }
  }
 
  public void checkGroup(Grid grid, Task task, boolean open) {
    if(lastId == 0 || lastId != task.getOrderReference().getId()) {
      lastId = task.getOrderReference().getId();
      Group group = new GroupExtended(task.getOrderReference().getFullDescription());
      group.setOpen(open);
      grid.getRows().appendChild(group);
    }
  }
 
  private WhereClause createCriteria(List<IFilterValue> values) {
    WhereClause wc = new WhereClause();
    wc.addClause("select t from Task as t");
    wc.addClause("where 1=1");
    for(IFilterValue v : values) {
      v.addConstraint(wc);
    }
    wc.addClause("order by t.orderReference, t.startDate, t.id");
    return wc;
  }
 
}