001    // Copyright 2009 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.ioc.internal.services;
016    
017    import org.apache.tapestry5.ioc.Resource;
018    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
019    import org.apache.tapestry5.ioc.internal.util.InternalUtils;
020    import org.apache.tapestry5.ioc.services.SymbolProvider;
021    
022    import java.io.IOException;
023    import java.io.InputStream;
024    import java.util.Map;
025    import java.util.Properties;
026    
027    /**
028     * Makes a {@link org.apache.tapestry5.ioc.Resource} available as a {@link org.apache.tapestry5.ioc.services.SymbolProvider}
029     *
030     * @since 5.1.0.5
031     */
032    public class ResourceSymbolProvider implements SymbolProvider
033    {
034        private final Resource resource;
035    
036        private final Map<String, String> properties = CollectionFactory.newCaseInsensitiveMap();
037    
038        public ResourceSymbolProvider(final Resource resource)
039        {
040            this.resource = resource;
041    
042            readProperties();
043        }
044    
045        private void readProperties()
046        {
047            Properties p = new Properties();
048    
049            InputStream is = null;
050    
051            try
052            {
053                is = resource.openStream();
054    
055                p.load(is);
056    
057                is.close();
058    
059                is = null;
060    
061                for (Map.Entry<Object, Object> entry : p.entrySet())
062                {
063                    String key = entry.getKey().toString();
064    
065                    properties.put(key, p.getProperty(key));
066                }
067            }
068            catch (IOException ex)
069            {
070                throw new RuntimeException(ex);
071            }
072            finally
073            {
074                InternalUtils.close(is);
075            }
076        }
077    
078        public String valueForSymbol(String symbolName)
079        {
080            return properties.get(symbolName);
081        }
082    }