001    // Copyright 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.coerce;
016    
017    import java.util.ArrayList;
018    import java.util.List;
019    
020    import org.apache.hivemind.util.Defense;
021    import org.apache.tapestry.form.IPropertySelectionModel;
022    
023    /**
024     * {@link org.apache.tapestry.form.IPropertySelectionModel} created from a comma-seperated string by
025     * {@link org.apache.tapestry.coerce.StringToPropertySelectionModelConverter}.
026     * 
027     * @author Howard M. Lewis Ship
028     * @since 4.0
029     */
030    public final class StringConvertedPropertySelectionModel implements IPropertySelectionModel
031    {
032        /**
033         * Entry.
034         * @author Howard Lewis Ship
035         */
036        private static class Entry
037        {
038            String _label;
039    
040            String _value;
041    
042            Entry(String term)
043            {
044                Defense.notNull(term, "term");
045    
046                int equalx = term.indexOf('=');
047    
048                if (equalx < 0)
049                {
050                    _label = term.trim();
051                    _value = _label;
052                }
053                else
054                {
055                    _label = term.substring(0, equalx).trim();
056                    _value = term.substring(equalx + 1).trim();
057                }
058            }
059        }
060    
061        private final List _entries;
062    
063        public StringConvertedPropertySelectionModel(String[] terms)
064        {
065            Defense.notNull(terms, "terms");
066    
067            _entries = new ArrayList(terms.length);
068    
069            for (int i = 0; i < terms.length; i++)
070            {
071                _entries.add(new Entry(terms[i]));
072            }
073        }
074    
075        public int getOptionCount()
076        {
077            return _entries.size();
078        }
079    
080        private Entry getEntry(int index)
081        {
082            return (Entry) _entries.get(index);
083        }
084    
085        public Object getOption(int index)
086        {
087            return getValue(index);
088        }
089    
090        public String getLabel(int index)
091        {
092            return getEntry(index)._label;
093        }
094    
095        public String getValue(int index)
096        {
097            return getEntry(index)._value;
098        }
099    
100        public boolean isDisabled(int index)
101        {
102            return false;
103        }
104        
105        public Object translateValue(String value)
106        {
107            // Values are the same on the client and the server, so no translation needed.
108            return value;
109        }
110    
111    }