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    
015    package org.apache.tapestry.form;
016    
017    /**
018     * Implementation of {@link IPropertySelectionModel} that allows one String from
019     * an array of Strings to be selected as the property.
020     * <p>
021     * Uses a simple index number as the value (used to represent the selected
022     * String). This assumes that the possible values for the Strings will remain
023     * constant between request cycles.
024     * 
025     * @author Howard Lewis Ship
026     */
027    
028    public class StringPropertySelectionModel implements IPropertySelectionModel
029    {
030    
031        private String[] _options;
032    
033        /**
034         * Standard constructor. The options are retained (not copied).
035         */
036    
037        public StringPropertySelectionModel(String[] options)
038        {
039            this._options = options;
040        }
041    
042        public int getOptionCount()
043        {
044            return _options.length;
045        }
046    
047        public Object getOption(int index)
048        {
049            return _options[index];
050        }
051    
052        /**
053         * Labels match options.
054         */
055    
056        public String getLabel(int index)
057        {
058            return _options[index];
059        }
060    
061        /**
062         * Values are indexes into the array of options.
063         */
064    
065        public String getValue(int index)
066        {
067            return Integer.toString(index);
068        }
069    
070        public Object translateValue(String value)
071        {
072            int index;
073    
074            index = Integer.parseInt(value);
075    
076            return _options[index];
077        }
078    
079    }