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.internal.util.CollectionFactory;
018import org.apache.tapestry5.ioc.internal.util.InternalUtils;
019import org.apache.tapestry5.ioc.services.SymbolProvider;
020
021import javax.servlet.ServletContext;
022import java.util.Map;
023
024/**
025 * A wrapper around {@link ServletContext} that makes init-parameters accessible as symbols.
026 */
027public class ServletContextSymbolProvider implements SymbolProvider
028{
029    private final Map<String, String> properties = CollectionFactory.newCaseInsensitiveMap();
030
031    public ServletContextSymbolProvider(ServletContext context)
032    {
033        for (String name : InternalUtils.toList(context.getInitParameterNames()))
034        {
035            properties.put(name, context.getInitParameter(name));
036        }
037    }
038
039    public String valueForSymbol(String symbolName)
040    {
041        return properties.get(symbolName);
042    }
043
044}