/*

  * 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.render;

 import java.util.Map;

 import javax.faces.component.EditableValueHolder;

 import javax.faces.component.UIComponent;

 import javax.faces.component.ValueHolder;

 import javax.faces.context.FacesContext;

 import org.seasar.framework.util.AssertionUtil;

 /**

  * @author shot

  */

 public abstract class AbstractDecoder implements Decoder {

     public void decode(FacesContext context, UIComponent component) {

         AssertionUtil.assertNotNull("context is null.", context);

         AssertionUtil.assertNotNull("component is null.", component);

         ValueHolderWrapper wrapper = createValueHolderWrapper(component);

         Map paramMap = getRequestParameterMap(context);

         String clientId = getClientId(component, context);

         if (paramMap.containsKey(clientId)) {

             Object value = paramMap.get(clientId);

             wrapper.setValue(value);

         }

     }

     public void decodeMany(FacesContext context, UIComponent component) {

         AssertionUtil.assertNotNull("context is null.", context);

         AssertionUtil.assertNotNull("component is null.", component);

         ValueHolderWrapper wrapper = createValueHolderWrapper(component);

         Map paramValuesMap = getRequestParameterValuesMap(context);

         String clientId = getClientId(component, context);

         String[] value = null;

         if (paramValuesMap.containsKey(clientId)) {

             value = (String[]) paramValuesMap.get(clientId);

         }

         if (value != null) {

             wrapper.setValue(value);

         } else {

             wrapper.setValue(new String[0]);

         }

     }

     protected abstract ValueHolderWrapper createValueHolderWrapper(

             UIComponent component);

     protected Map getRequestParameterMap(FacesContext context) {

         return context.getExternalContext().getRequestParameterMap();

     }

     protected Map getRequestParameterValuesMap(FacesContext context) {

         return context.getExternalContext().getRequestParameterValuesMap();

     }

     protected String getClientId(UIComponent component, FacesContext context) {

         return component.getClientId(context);

     }

     protected static class ValueHolderWrapper {

         private ValueHolder holder;

         public ValueHolderWrapper(ValueHolder holder) {

             this.holder = holder;

         }

         public void setValue(Object value) {

             if (holder instanceof EditableValueHolder) {

                 ((EditableValueHolder) holder).setSubmittedValue(value);

             } else {

                 holder.setValue(value);

             }

         }

         public Object getValue() {

             if (holder instanceof EditableValueHolder) {

                 return ((EditableValueHolder) holder).getSubmittedValue();

             } else {

                 return holder.getValue();

             }

         }

     }

 }