py.una.pol.karaku.util.KarakuConverter.java Source code

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Here is the source code for py.una.pol.karaku.util.KarakuConverter.java

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/*-
 * Copyright (c)
 *
 *       2012-2014, Facultad Politcnica, Universidad Nacional de Asuncin.
 *       2012-2014, Facultad de Ciencias Mdicas, Universidad Nacional de Asuncin.
 *       2012-2013, Centro Nacional de Computacin, Universidad Nacional de Asuncin.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */
package py.una.pol.karaku.util;

import java.lang.reflect.Field;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.persistence.Id;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import py.una.pol.karaku.domain.BaseEntity;

/**
 * 
 * @author Arturo Volpe
 * @since 1.0
 * @version 1.0 Jun 6, 2013
 * 
 */
@Component
public class KarakuConverter implements Converter {

    private final Logger log = LoggerFactory.getLogger(KarakuConverter.class);

    private static KarakuConverter INSTANCE = new KarakuConverter();

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {

        return SelectHelper.findValueByStringConversion(context, component, value, this);
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object object) {

        if (context == null) {
            throw new IllegalArgumentException("context");
        }
        if (component == null) {
            throw new IllegalArgumentException("component");
        }
        if (object == null) {
            return "";
        }

        if (object instanceof BaseEntity) {
            BaseEntity entity = (BaseEntity) object;
            if (entity.getId() == null) {
                return "";
            }
            return entity.getId().toString();
        }
        try {
            return getIdValue(object).toString();
        } catch (Exception e) {
            log.error("Error al obtener el Id", e);
        }
        return null;
    }

    private Object getIdValue(Object obj) {

        try {
            for (Field field : obj.getClass().getDeclaredFields()) {
                if (field.isAnnotationPresent(Id.class)) {
                    field.setAccessible(true);
                    Object data = field.get(obj);
                    field.setAccessible(false);
                    return data;
                }
            }
            return null;
        } catch (Exception ex) {
            log.error("Error al obtener el Id", ex);
            return null;
        }
    }

    /**
     * @return iNSTANCE
     */
    public static KarakuConverter getInstance() {

        return INSTANCE;
    }

}