JpaListbox.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.jpa.input;
 
import java.util.List;
import org.turro.i18n.I_;
import org.turro.jpa.Dao;
import org.turro.zkoss.input.GenericListbox;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zul.Listitem;
 
public abstract class JpaListbox<V> extends GenericListbox<V> {
 
  private Dao dao;
  private String query;
  private boolean autoSave = true;
  private boolean allowNull;
  private String nullLabel = "None";
 
  public JpaListbox() {
  }
 
  public JpaListbox(Dao dao, String query, boolean checkmark, boolean autoSave) {
    this.dao = dao;
    this.query = query;
    this.autoSave = autoSave;
    setCheckmark(checkmark);
  }
 
  public boolean isAutoSave() {
    return autoSave;
  }
 
  public void setAutoSave(boolean autoSave) {
    this.autoSave = autoSave;
  }
 
  public Dao getDao() {
    return dao;
  }
 
  public void setDao(Dao dao) {
    this.dao = dao;
  }
 
  public String getQuery() {
    return query;
  }
 
  public void setQuery(String query) {
    this.query = query;
  }
 
  @Override
  protected void populateList() {
    if(dao == null) return;
    if(allowNull) {
      Listitem li = new Listitem(I_.get(nullLabel), null);
      appendChild(li);
    }
    for(Object o : dao.getResultList(query)) {
      Listitem li = new Listitem(convertToString((V) o), o);
      if(isCheckmark()) {
        li.setSelected(getChecked((V) o));
      }
      appendChild(li);
    }
    addEventListener(Events.ON_SELECT, new EventListener() {
      @Override
      public void onEvent(Event event) throws Exception {
        for(Listitem li : (List<Listitem>) getItems()) {
          if(getChecked((V) li.getValue()) != li.isSelected()) {
            setChecked((V) li.getValue(), li.isSelected());
            if(autoSave) {
              dao.saveObject(li.getValue());
            }
          }
        }
      }
    });
  }
 
  public abstract String convertToString(V v);
  public abstract boolean getChecked(V v);
  public abstract void setChecked(V v, boolean checked);
 
  public boolean isAllowNull() {
    return allowNull;
  }
 
  public void setAllowNull(boolean allowNull) {
    this.allowNull = allowNull;
  }
 
  public String getNullLabel() {
    return nullLabel;
  }
 
  public void setNullLabel(String nullLabel) {
    this.nullLabel = nullLabel;
  }
  
  @Override
  protected boolean equals(V value, V obj) {
    String v1 = value == null ? null : convertToString(value);
    String v2 = obj == null ? null : convertToString(obj);
    return (v1 == null && v2 == null) ||
            (v1 != null && v1.equals(v2));
  }
 
}