    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    }