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
015package org.apache.tapestry5.internal;
016
017import org.apache.tapestry5.ioc.services.SymbolProvider;
018
019/**
020 * Implementation of {@link SymbolProvider} that only supports a single key/value pair.
021 */
022public 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}