/**
* 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.processor;
import java.util.Comparator;
import java.util.List;
import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Message;
import org.apache.camel.spi.IdAware;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.AsyncProcessorHelper;
/**
* A processor that sorts the expression using a comparator
*/
public class SortProcessor<T> extends ServiceSupport implements AsyncProcessor, Traceable, IdAware {
private String id;
private final Expression expression;
private final Comparator<? super T> comparator;
public SortProcessor(Expression expression, Comparator<? super T> comparator) {
this.expression = expression;
this.comparator = comparator;
}
public void process(Exchange exchange) throws Exception {
AsyncProcessorHelper.process(this, exchange);
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
try {
Message in = exchange.getIn();
@SuppressWarnings("unchecked")
List<T> list = expression.evaluate(exchange, List.class);
list.sort(comparator);
if (exchange.getPattern().isOutCapable()) {
Message out = exchange.getOut();
out.copyFromWithNewBody(in, list);
} else {
in.setBody(list);
}
} catch (Exception e) {
exchange.setException(e);
}
callback.done(true);
return true;
}
public String toString() {
return "Sort[" + expression + "]";
}
@Override
public String getTraceLabel() {
return "sort[" + expression + "]";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Expression getExpression() {
return expression;
}
public Comparator<? super T> getComparator() {
return comparator;
}
@Override
protected void doStart() throws Exception {
// noop
}
@Override
protected void doStop() throws Exception {
// noop
}
}