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.internal.util.CollectionFactory;
018    import org.apache.tapestry5.ioc.internal.util.InternalUtils;
019    import org.apache.tapestry5.ioc.services.SymbolProvider;
020    
021    import javax.servlet.ServletContext;
022    import java.util.Map;
023    
024    /**
025     * A wrapper around {@link ServletContext} that makes init-parameters accessible as symbols.
026     */
027    public 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    }