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;
018    
019    import org.apache.camel.impl.DefaultComponent;
020    import org.slf4j.Logger;
021    import org.slf4j.LoggerFactory;
022    import org.springframework.core.io.Resource;
023    import org.springframework.core.io.ResourceLoader;
024    
025    /**
026     * A useful base class for components which depend on a resource
027     * such as things like Velocity or XQuery based components.
028     *
029     * @deprecated use {@link DefaultComponent}. Will be removed in Camel 3.0.
030     */
031    @Deprecated
032    public abstract class ResourceBasedComponent extends DefaultComponent {
033        protected final transient Logger log = LoggerFactory.getLogger(getClass());
034        private ResourceLoader resourceLoader;
035    
036        public ResourceLoader getResourceLoader() {
037            if (resourceLoader == null) {
038                resourceLoader = new CamelResourceLoader(getCamelContext());
039            }
040            return resourceLoader;
041        }
042    
043        public void setResourceLoader(ResourceLoader resourceLoader) {
044            this.resourceLoader = resourceLoader;
045        }
046    
047        protected Resource resolveMandatoryResource(String uri) {
048            Resource resource = getResourceLoader().getResource(uri);
049            if (resource == null) {
050                throw new IllegalArgumentException("Could not find resource for URI: " + uri + " using: " + getResourceLoader());
051            } else {
052                return resource;
053            }
054        }
055    
056    }