/**
* 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.model;
import javax.xml.bind.annotation.XmlRootElement;
import org.apache.camel.Predicate;
import org.apache.camel.model.language.ExpressionDefinition;
import org.apache.camel.processor.FilterProcessor;
import org.apache.camel.spi.AsPredicate;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.RouteContext;
/**
* Triggers a route when an expression evaluates to <tt>true</tt>
*
* @version
*/
@Metadata(label = "eip,routing") @AsPredicate
@XmlRootElement(name = "when")
public class WhenDefinition extends ExpressionNode {
public WhenDefinition() {
}
public WhenDefinition(Predicate predicate) {
super(predicate);
}
public WhenDefinition(ExpressionDefinition expression) {
super(expression);
}
@Override
public String toString() {
return "When[" + description() + " -> " + getOutputs() + "]";
}
protected String description() {
StringBuilder sb = new StringBuilder();
if (getExpression() != null) {
String language = getExpression().getLanguage();
if (language != null) {
sb.append(language).append("{");
}
sb.append(getExpression().getLabel());
if (language != null) {
sb.append("}");
}
}
return sb.toString();
}
@Override
public String getLabel() {
return "when[" + description() + "]";
}
@Override
public FilterProcessor createProcessor(RouteContext routeContext) throws Exception {
return createFilterProcessor(routeContext);
}
/**
* Expression used as the predicate to evaluate whether this when should trigger and route the message or not.
*/
@Override
public void setExpression(ExpressionDefinition expression) {
// override to include javadoc what the expression is used for
super.setExpression(expression);
}
@Override
public ProcessorDefinition<?> endParent() {
// when using when in the DSL we don't want to end back to this when, but instead
// the parent of this, so return the parent
return this.getParent();
}
}