001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    package org.apache.tapestry.form;
015    
016    
017    /**
018     * Implementation of a property model that works off of native
019     * java enum types.
020     * 
021     * <p>
022     *  The enum label/values are all translated by calling Enum.toString() on your individual 
023     *  enum types, so it may be a good idea to provide a toString() method in your Enums if the
024     *  types aren't what you would prefer to display.
025     * </p>
026     */
027    public class EnumPropertySelectionModel implements IPropertySelectionModel
028    {
029        private Enum[] _set;
030        
031        public EnumPropertySelectionModel(Enum[] set)
032        {
033            _set = set;
034        }
035        
036        /**
037         * {@inheritDoc}
038         */
039        public String getLabel(int index)
040        {
041            if (index == 0)
042                return "None";
043            
044            return _set[index - 1].toString();
045        }
046        
047        /**
048         * {@inheritDoc}
049         */
050        public Object getOption(int index)
051        {
052            if (index == 0)
053                return null;
054            
055            return _set[index - 1];
056        }
057    
058        /**
059         * {@inheritDoc}
060         */
061        public int getOptionCount()
062        {
063            return _set.length + 1;
064        }
065    
066        /**
067         * {@inheritDoc}
068         */
069        public String getValue(int index)
070        {
071            if (index == 0)
072                return "None";
073            
074            return _set[index - 1].toString();
075        }
076        
077        public boolean isDisabled(int index)
078        {
079            return false;
080        }
081        
082        /**
083         * {@inheritDoc}
084         */
085        public Object translateValue(String value)
086        {
087            for (Enum e : _set) {
088                if (e.toString().equals(value))
089                    return e;
090            }
091            
092            return null;
093        }
094    }