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.Component; 020 import org.apache.camel.Processor; 021 import org.apache.camel.impl.ProcessorEndpoint; 022 import org.apache.commons.logging.Log; 023 import org.apache.commons.logging.LogFactory; 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 endpoints which depend on a resource 030 * such as things like Velocity or XQuery based components 031 * 032 * @version $Revision: 41334 $ 033 */ 034 public abstract class ResourceBasedEndpoint extends ProcessorEndpoint { 035 protected final transient Log log = LogFactory.getLog(getClass()); 036 private final String resourceUri; 037 private ResourceLoader resourceLoader = new DefaultResourceLoader(); 038 private Resource resource; 039 040 public ResourceBasedEndpoint(String endpointUri, Component component, String resourceUri, Processor processor) { 041 super(endpointUri, component, processor); 042 this.resourceUri = resourceUri; 043 } 044 045 protected ResourceBasedEndpoint(String endpointUri, Processor processor, String resourceUri) { 046 super(endpointUri, processor); 047 this.resourceUri = resourceUri; 048 } 049 050 public Resource getResource() { 051 if (resource == null) { 052 resource = getResourceLoader().getResource(resourceUri); 053 if (resource == null) { 054 throw new IllegalArgumentException("Could not find resource for URI: " + resourceUri + " using: " + getResourceLoader()); 055 } 056 } 057 return resource; 058 } 059 060 public ResourceLoader getResourceLoader() { 061 return resourceLoader; 062 } 063 064 public void setResourceLoader(ResourceLoader resourceLoader) { 065 this.resourceLoader = resourceLoader; 066 } 067 }