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.Exchange;
020 import org.apache.camel.impl.DefaultComponent;
021 import org.apache.commons.logging.Log;
022 import org.apache.commons.logging.LogFactory;
023
024 import org.springframework.core.io.DefaultResourceLoader;
025 import org.springframework.core.io.Resource;
026 import org.springframework.core.io.ResourceLoader;
027
028 /**
029 * A useful base class for components which depend on a resource
030 * such as things like Velocity or XQuery based components.
031 *
032 * @version $Revision: 673477 $
033 */
034 public abstract class ResourceBasedComponent extends DefaultComponent<Exchange> {
035 protected final transient Log log = LogFactory.getLog(getClass());
036 private ResourceLoader resourceLoader = new DefaultResourceLoader();
037
038 public ResourceLoader getResourceLoader() {
039 return resourceLoader;
040 }
041
042 public void setResourceLoader(ResourceLoader resourceLoader) {
043 this.resourceLoader = resourceLoader;
044 }
045
046 protected Resource resolveMandatoryResource(String uri) {
047 Resource resource = getResourceLoader().getResource(uri);
048 if (resource == null) {
049 throw new IllegalArgumentException("Could not find resource for URI: " + uri + " using: " + getResourceLoader());
050 } else {
051 return resource;
052 }
053 }
054
055 }