/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.component.freemarker;
import java.net.URL;
import java.util.Map;
import freemarker.cache.NullCacheStorage;
import freemarker.cache.URLTemplateLoader;
import freemarker.template.Configuration;
import org.apache.camel.Endpoint;
import org.apache.camel.impl.DefaultComponent;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ResourceHelper;
/**
* Freemarker component.
*/
public class FreemarkerComponent extends DefaultComponent {
private Configuration configuration;
private Configuration noCacheConfiguration;
protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception {
// should we use regular configuration or no cache (content cache is default true)
Configuration config;
String encoding = getAndRemoveParameter(parameters, "encoding", String.class);
boolean cache = getAndRemoveParameter(parameters, "contentCache", Boolean.class, Boolean.TRUE);
if (cache) {
config = getConfiguration();
int templateUpdateDelay = getAndRemoveParameter(parameters, "templateUpdateDelay", Integer.class, 0);
if (templateUpdateDelay > 0) {
config.setTemplateUpdateDelay(templateUpdateDelay);
}
} else {
config = getNoCacheConfiguration();
}
FreemarkerEndpoint endpoint = new FreemarkerEndpoint(uri, this, remaining);
if (ObjectHelper.isNotEmpty(encoding)) {
endpoint.setEncoding(encoding);
}
endpoint.setConfiguration(config);
// if its a http resource then append any remaining parameters and update the resource uri
if (ResourceHelper.isHttpUri(remaining)) {
remaining = ResourceHelper.appendParameters(remaining, parameters);
endpoint.setResourceUri(remaining);
}
return endpoint;
}
public synchronized Configuration getConfiguration() {
if (configuration == null) {
configuration = new Configuration();
configuration.setTemplateLoader(new URLTemplateLoader() {
@Override
protected URL getURL(String name) {
try {
return ResourceHelper.resolveMandatoryResourceAsUrl(getCamelContext().getClassResolver(), name);
} catch (Exception e) {
// freemarker prefers to ask for locale first (eg xxx_en_GB, xxX_en), and then fallback without locale
// so we should return null to signal the resource could not be found
return null;
}
}
});
}
return (Configuration) configuration.clone();
}
public void setConfiguration(Configuration configuration) {
this.configuration = configuration;
}
private synchronized Configuration getNoCacheConfiguration() {
if (noCacheConfiguration == null) {
// create a clone of the regular configuration
noCacheConfiguration = (Configuration) getConfiguration().clone();
// set this one to not use cache
noCacheConfiguration.setCacheStorage(new NullCacheStorage());
}
return noCacheConfiguration;
}
}