// Copyright 2006 Daniel Gredler

 //

 // 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 net.sf.beanform.util;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.List;

 import org.apache.hivemind.Messages;

 import org.apache.tapestry.form.IPropertySelectionModel;

 /**

  * A generic {@link IPropertySelectionModel} implementation for enumerations.

  *

  * @author Daniel Gredler

  */

 public class EnumPropertySelectionModel<T extends Enum<T>> implements IPropertySelectionModel {

     private List<T> values;

     private List<String> labels;

     public EnumPropertySelectionModel( Class<T> type, boolean includeEmptyOption, Messages messages ) {

         this.values = new ArrayList<T>();

         if( includeEmptyOption ) this.values.add( null );

         T[] enums = type.getEnumConstants();

         this.values.addAll( Arrays.asList( enums ) );

         this.labels = new ArrayList<String>( this.values.size() );

         for( T value : this.values ) {

             if( value == null ) this.labels.add( "" );

             else this.labels.add( messages.getMessage( value.toString() ) );

         }

     }

     public int getOptionCount() {

         return this.values.size();

     }

     public Object getOption( int index ) {

         return this.values.get( index );

     }

     public String getLabel( int index ) {

         return this.labels.get( index );

     }

     public String getValue( int index ) {

         return Integer.toString( index );

     }

     public Object translateValue( String value ) {

         return this.values.get( Integer.parseInt( value ) );

     }

 }