/*

  * 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 javax.faces.component.EditableValueHolder;

 import javax.faces.component.UIComponent;

 import javax.faces.component.ValueHolder;

 import javax.faces.context.FacesContext;

 import javax.faces.convert.Converter;

 import org.seasar.teeda.core.exception.NoValueHolderRuntimeException;

 /**

  * @author manhole

  */

 public class ValueHolderUtil {

     public static Object getValue(final UIComponent component) {

         if (!(component instanceof ValueHolder)) {

             throw new NoValueHolderRuntimeException(component.getClass());

         }

         final ValueHolder vh = (ValueHolder) component;

         return vh.getValue();

     }

     public static String getValueForRender(final FacesContext context,

             final UIComponent component) {

         if (!(component instanceof ValueHolder)) {

             throw new IllegalArgumentException("component must be ValueHolder");

         }

         if (component instanceof EditableValueHolder) {

             final EditableValueHolder evh = (EditableValueHolder) component;

             final Object submittedValue = evh.getSubmittedValue();

             if (submittedValue != null) {

                 if (submittedValue instanceof String) {

                     return (String) submittedValue;

                 }

                 return submittedValue.toString();

             }

         }

         final ValueHolder vh = (ValueHolder) component;

         final Object value = vh.getValue();

         final Converter converter = ConverterUtil.getConverter(component);

         return UIValueUtil.getValueAsString(context, component, value,

                 converter);

     }

     public static String[] getValuesForRender(final FacesContext context,

             final UIComponent component) {

         if (!(component instanceof ValueHolder)) {

             throw new IllegalArgumentException("component must be ValueHolder");

         }

         if (component instanceof EditableValueHolder) {

             final EditableValueHolder evh = (EditableValueHolder) component;

             final Object submittedValue = evh.getSubmittedValue();

             if (submittedValue instanceof String[]) {

                 return (String[]) submittedValue;

             }

         }

         final ValueHolder vh = (ValueHolder) component;

         final Object value = vh.getValue();

         if (value == null) {

             return new String[0];

         }

         final Converter converter = vh.getConverter();

         final int length = Array.getLength(value);

         final String[] values = new String[length];

         for (int i = 0; i < length; ++i) {

             values[i] = UIValueUtil.getValueAsString(context, component, Array

                     .get(value, i), converter);

         }

         return values;

     }

 }