/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,

  * either express or implied. See the License for the specific language

  * governing permissions and limitations under the License.

  */

 package org.seasar.teeda.core.util;

 import java.lang.reflect.Array;

 import java.util.List;

 import javax.faces.FacesException;

 import javax.faces.component.UIComponent;

 import javax.faces.context.FacesContext;

 import javax.faces.convert.Converter;

 import org.seasar.framework.log.Logger;

 /**

  * @author manhole

  */

 public class UIValueUtil {

     private static Logger logger_ = Logger.getLogger(UIValueUtil.class);

     public static String getValueAsString(FacesContext context,

             UIComponent component, Object value, Converter converter) {

         if (converter == null && value != null) {

             if (value instanceof String) {

                 return (String) value;

             }

             try {

                 converter = context.getApplication().createConverter(

                         value.getClass());

             } catch (FacesException ex) {

                 logger_.log(ex);

             }

         }

         if (converter == null) {

             if (value == null) {

                 return "";

             }

             return value.toString();

         }

         return converter.getAsString(context, component, value);

     }

     public static final boolean isManyEmpty(Object value) {

         return value == null

                 || (value.getClass().isArray() && Array.getLength(value) == 0)

                 || ((value instanceof List) && ((List) value).isEmpty());

     }

 }