/**
* 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.file.remote;
import org.apache.camel.Expression;
import org.apache.camel.Message;
import org.apache.camel.component.file.FileComponent;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.language.simple.FileLanguage;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public abstract class RemoteFileProducer<T extends RemoteFileExchange> extends DefaultProducer<T> {
protected final transient Log log = LogFactory.getLog(getClass());
protected RemoteFileEndpoint<T> endpoint;
protected RemoteFileProducer(RemoteFileEndpoint<T> endpoint) {
super(endpoint);
this.endpoint = endpoint;
}
protected String createFileName(Message message, RemoteFileConfiguration fileConfig) {
String answer;
String name = message.getHeader(FileComponent.HEADER_FILE_NAME, String.class);
// expression support
Expression expression = endpoint.getConfiguration().getExpression();
if (name != null) {
// the header name can be an expression too, that should override whatever configured on the endpoint
if (name.indexOf("${") > -1) {
if (log.isDebugEnabled()) {
log.debug(FileComponent.HEADER_FILE_NAME + " contains a FileLanguage expression: " + name);
}
expression = FileLanguage.file(name);
}
}
if (expression != null) {
if (log.isDebugEnabled()) {
log.debug("Filename evaluated as expression: " + expression);
}
Object result = expression.evaluate(message.getExchange());
name = message.getExchange().getContext().getTypeConverter().convertTo(String.class, result);
}
String endpointFile = fileConfig.getFile();
if (fileConfig.isDirectory()) {
// If the path isn't empty, we need to add a trailing / if it isn't already there
String baseDir = "";
if (endpointFile.length() > 0) {
baseDir = endpointFile + (endpointFile.endsWith("/") ? "" : "/");
}
String fileName = (name != null) ? name : endpoint.getGeneratedFileName(message);
answer = baseDir + fileName;
} else {
answer = endpointFile;
}
// lets store the name we really used in the header, so end-users can retrieve it
message.setHeader(FileComponent.HEADER_FILE_NAME_PRODUCED, answer);
return answer;
}
protected String remoteServer() {
return endpoint.getConfiguration().remoteServerInformation();
}
@Override
protected void doStart() throws Exception {
log.info("Starting");
// do not connect when component starts, just wait until we process as we will
// connect at that time if needed
super.doStart();
}
@Override
protected void doStop() throws Exception {
log.info("Stopping");
// disconnect when stopping
try {
disconnect();
} catch (Exception e) {
// ignore just log a warning
log.warn("Exception occured during disconecting from " + remoteServer() + ". "
+ e.getClass().getCanonicalName() + " message: " + e.getMessage());
}
super.doStop();
}
protected abstract void connectIfNecessary() throws Exception;
protected abstract void disconnect() throws Exception;
}