/*

  * 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.viewer;

 import java.util.HashMap;

 import java.util.Map;

 import org.eclipse.jface.viewers.ILabelProviderListener;

 import org.eclipse.jface.viewers.ITableLabelProvider;

 import org.eclipse.swt.graphics.Image;

 import org.seasar.framework.beans.BeanDesc;

 import org.seasar.framework.beans.PropertyDesc;

 import org.seasar.framework.beans.factory.BeanDescFactory;

 import org.seasar.uruma.annotation.BindingLabel;

 /**

  * 汎用的な {@link ITableLabelProvider} の実装クラスです。<br />

  * <p>

  * {@link GenericTableLabelProvider#setTargetClass(Class) setTargetClass()}

  * メソッドで設定されたクラスの中から {@link BindingLabel} アノテーションが付加されたフィールドを、テーブルのカラムとして表示します。

  * </p>

  * 

  * @author y-komori

  */

 public class GenericTableLabelProvider implements ITableLabelProvider,

         TargetClassHoldingProvider {

     protected Map<String, Integer> columnNoMap = new HashMap<String, Integer>();

     protected Map<Integer, PropertyDesc> columnMap = new HashMap<Integer, PropertyDesc>();

     /*

      * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnImage(java.lang.Object,

      *      int)

      */

     public Image getColumnImage(final Object element, final int columnIndex) {

         return null;

     }

     /*

      * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnText(java.lang.Object,

      *      int)

      */

     public String getColumnText(final Object element, final int columnIndex) {

         PropertyDesc pd = columnMap.get(columnIndex);

         if (pd != null && pd.isReadable()) {

             Object value = pd.getValue(element);

             return (value != null) ? value.toString() : "";

         } else {

             return "";

         }

     }

     public void addListener(final ILabelProviderListener listener) {

         // Do nothing.

     }

     public void dispose() {

         // Do nothing.

     }

     public boolean isLabelProperty(final Object element, final String property) {

         return false;

         // Do nothing.

     }

     public void removeListener(final ILabelProviderListener listener) {

         // Do nothing.

     }

     /*

      * @see org.seasar.uruma.viewer.TargetClassHoldingProvider#setTargetClass(java.lang.Class)

      */

     public void setTargetClass(final Class<?> clazz) {

         BeanDesc desc = BeanDescFactory.getBeanDesc(clazz);

         for (String columnName : columnNoMap.keySet()) {

             if (desc.hasPropertyDesc(columnName)) {

                 PropertyDesc pd = desc.getPropertyDesc(columnName);

                 columnMap.put(columnNoMap.get(columnName), pd);

             }

         }

     }

     /**

      * カラム名とカラム番号の対応を設定します。<br />

      * 

      * @param columnNo

      *            カラム番号

      * @param columnName

      *            カラム名

      */

     public void addColumnMap(final int columnNo, final String columnName) {

         columnNoMap.put(columnName, columnNo);

     }

 }