001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.console.command.store.amq;
018
019import java.io.ByteArrayInputStream;
020import java.io.InputStream;
021import java.util.HashMap;
022
023import org.apache.commons.collections.ExtendedProperties;
024import org.apache.velocity.exception.ResourceNotFoundException;
025import org.apache.velocity.runtime.RuntimeServices;
026import org.apache.velocity.runtime.resource.Resource;
027import org.apache.velocity.runtime.resource.loader.FileResourceLoader;
028import org.apache.velocity.runtime.resource.loader.ResourceLoader;
029
030public class CustomResourceLoader extends ResourceLoader {
031        
032        private final static ThreadLocal<HashMap<String, String>> resourcesTL = new ThreadLocal<HashMap<String, String>>();
033        private final FileResourceLoader fileResourceLoader = new FileResourceLoader();
034        
035        @Override
036        public void commonInit(RuntimeServices rs, ExtendedProperties configuration) {
037                super.commonInit(rs, configuration);
038                fileResourceLoader.commonInit(rs, configuration);
039        }
040        
041    public void init( ExtendedProperties configuration)
042    {
043        fileResourceLoader.init(configuration);
044        
045        // AMQ-3665: Turn on template caching as otherwise the journal reader 
046        // could run out of memory on large journal files
047        this.setCachingOn(true); 
048    }
049    
050    /**
051     */
052    public synchronized InputStream getResourceStream( String name )
053        throws ResourceNotFoundException
054    {
055        InputStream result = null;
056        
057        if (name == null || name.length() == 0)
058        {
059            throw new ResourceNotFoundException ("No template name provided");
060        }
061        
062        String value = null;
063        HashMap<String, String> resources = resourcesTL.get();
064        if( resources!=null ) {
065                value = resources.get(name);
066        }
067        
068        if( value == null ) {
069                result = this.fileResourceLoader.getResourceStream(name);
070        } else {
071            try 
072            {
073                result = new ByteArrayInputStream(value.getBytes());
074            }
075            catch( Exception e )
076            {
077                throw new ResourceNotFoundException( e.getMessage() );
078            }
079        }
080        return result;
081    }
082    
083    public boolean isSourceModified(Resource resource)
084    {
085        return false;
086    }
087
088    public long getLastModified(Resource resource)
089    {
090        return 0;
091    }
092
093        static public HashMap<String, String> getResources() {
094                return resourcesTL.get();
095        }
096
097        static public void setResources(HashMap<String, String> arg0) {
098                resourcesTL.set(arg0);
099        }
100
101}