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.freemarker;
018    
019    import java.net.URL;
020    import java.util.Map;
021    
022    import freemarker.cache.URLTemplateLoader;
023    import freemarker.template.Configuration;
024    import org.apache.camel.Endpoint;
025    import org.apache.camel.component.ResourceBasedComponent;
026    import org.apache.camel.util.ObjectHelper;
027    
028    /**
029     * Freemarker component.
030     */
031    public class FreemarkerComponent extends ResourceBasedComponent {
032    
033        private Configuration configuration;
034        private Configuration noCacheConfiguration;
035    
036        protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception {
037            FreemarkerEndpoint endpoint = new FreemarkerEndpoint(uri, this, remaining);
038    
039            // should we use regular configuration or no cache (content cache is default true)
040            Configuration config;
041            String encoding = getAndRemoveParameter(parameters, "encoding", String.class);
042            if (ObjectHelper.isNotEmpty(encoding)) {
043                endpoint.setEncoding(encoding);
044            }
045            boolean cache = getAndRemoveParameter(parameters, "contentCache", Boolean.class, Boolean.TRUE);
046            if (cache) {
047                config = getConfiguration();
048            } else {
049                config = getNoCacheConfiguration();
050            }
051    
052            endpoint.setConfiguration(config);
053            return endpoint;
054        }
055    
056        public synchronized Configuration getConfiguration() {
057            if (configuration == null) {
058                configuration = new Configuration();
059                configuration.setTemplateLoader(new URLTemplateLoader() {
060                    @Override
061                    protected URL getURL(String name) {
062                        return getResourceLoader().getClassLoader().getResource(name);
063                    }
064                });
065            }
066            return (Configuration) configuration.clone();
067        }
068    
069        public void setConfiguration(Configuration configuration) {
070            this.configuration = configuration;
071        }
072    
073        private synchronized Configuration getNoCacheConfiguration() {
074            if (noCacheConfiguration == null) {
075                // create a clone of the regular configuration
076                noCacheConfiguration = (Configuration) getConfiguration().clone();
077                // set this one to not use cache
078                noCacheConfiguration.setCacheStorage(new NoCacheStorage());
079            }
080            return noCacheConfiguration;
081        }
082    
083    }