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.apache.commons.logging.Log;
021 import org.apache.commons.logging.LogFactory;
022
023 import org.springframework.core.io.DefaultResourceLoader;
024 import org.springframework.core.io.Resource;
025 import org.springframework.core.io.ResourceLoader;
026
027 /**
028 * A useful base class for components which depend on a resource
029 * such as things like Velocity or XQuery based components.
030 *
031 * @version $Revision: 743658 $
032 */
033 public abstract class ResourceBasedComponent extends DefaultComponent {
034 protected final transient Log log = LogFactory.getLog(getClass());
035 private ResourceLoader resourceLoader = new DefaultResourceLoader();
036
037 public ResourceLoader getResourceLoader() {
038 return resourceLoader;
039 }
040
041 public void setResourceLoader(ResourceLoader resourceLoader) {
042 this.resourceLoader = resourceLoader;
043 }
044
045 protected Resource resolveMandatoryResource(String uri) {
046 Resource resource = getResourceLoader().getResource(uri);
047 if (resource == null) {
048 throw new IllegalArgumentException("Could not find resource for URI: " + uri + " using: " + getResourceLoader());
049 } else {
050 return resource;
051 }
052 }
053
054 }