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     */
017    package org.apache.camel.component.velocity;
018    
019    import java.io.InputStream;
020    
021    import org.apache.camel.spi.ClassResolver;
022    import org.apache.camel.util.ObjectHelper;
023    import org.apache.commons.collections.ExtendedProperties;
024    import org.apache.velocity.exception.ResourceNotFoundException;
025    import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;
026    
027    /**
028     * Camel specific {@link ClasspathResourceLoader} that loads resources using the
029     * Camel {@link ClassResolver}
030     */
031    public class CamelVelocityClasspathResourceLoader extends ClasspathResourceLoader {
032    
033        private ClassResolver resolver;
034    
035        @Override
036        public void init(ExtendedProperties configuration) {
037            super.init(configuration);
038            resolver = (ClassResolver) this.rsvc.getProperty("CamelClassResolver");
039            ObjectHelper.notNull(resolver, "ClassResolver");
040        }
041    
042        @Override
043        public InputStream getResourceStream(String name) throws ResourceNotFoundException {
044            InputStream is = resolver.loadResourceAsStream(name);
045            if (is == null) {
046                return super.getResourceStream(name);
047            } else {
048                return is;
049            }
050        }
051    
052    }