001    // Copyright 2007 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.tapestry5.internal;
016    
017    import org.apache.tapestry5.ioc.services.SymbolProvider;
018    
019    /**
020     * Implementation of {@link SymbolProvider} that only supports a single key/value pair.
021     */
022    public class SingleKeySymbolProvider implements SymbolProvider
023    {
024        private final String symbolName;
025    
026        private final String value;
027    
028        public SingleKeySymbolProvider(final String symbolName, final String value)
029        {
030            this.symbolName = symbolName;
031            this.value = value;
032        }
033    
034        public String valueForSymbol(String symbolName)
035        {
036            if (this.symbolName.equalsIgnoreCase(symbolName)) return value;
037    
038            return null;
039        }
040    
041    }