/*

  * Copyright 2004-2008 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.uruma.binding.value.binder;

 import org.eclipse.jface.viewers.TreeViewer;

 import org.seasar.framework.beans.PropertyDesc;

 import org.seasar.uruma.binding.value.ValueBinder;

 import org.seasar.uruma.component.UIComponent;

 import org.seasar.uruma.viewer.UrumaTreeViewer;

 /**

  * {@link TreeViewer} のための {@link ValueBinder} です。<br />

  * 

  * @author y-komori

  */

 public class TreeViewerValueBinder extends AbstractValueBinder<UrumaTreeViewer> {

     /**

      * {@link TreeViewerValueBinder} を構築します。<br />

      */

     public TreeViewerValueBinder() {

         super(UrumaTreeViewer.class);

     }

     /*

      * @see org.seasar.uruma.binding.value.binder.AbstractValueBinder#doExportValue(java.lang.Object,

      *      java.lang.Object, org.seasar.framework.beans.PropertyDesc)

      */

     @Override

     public void doExportValue(final UrumaTreeViewer widget,

             final Object formObj, final PropertyDesc propDesc,

             final UIComponent uiComp) {

         if (widget.getContentProvider() != null) {

             Object value = propDesc.getValue(formObj);

             if (value != null) {

                 Object oldValue = widget.getInput();

                 if (oldValue != value) {

                     logBinding(EXPORT_VALUE, formObj, propDesc, widget, null,

                             value);

                     widget.setInput(value);

                 }

             }

         }

     }

 }