/**
* 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 java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElementRef;
import org.apache.camel.Expression;
import org.apache.camel.Predicate;
import org.apache.camel.Processor;
import org.apache.camel.builder.ExpressionClause;
import org.apache.camel.model.language.ExpressionDefinition;
import org.apache.camel.processor.FilterProcessor;
import org.apache.camel.spi.RouteContext;
/**
* A base class for nodes which contain an expression and a number of outputs
*
* @version
*/
@XmlAccessorType(XmlAccessType.FIELD)
public abstract class ExpressionNode extends ProcessorDefinition<ExpressionNode> {
@XmlElementRef
private ExpressionDefinition expression;
@XmlElementRef
private List<ProcessorDefinition<?>> outputs = new ArrayList<ProcessorDefinition<?>>();
public ExpressionNode() {
}
public ExpressionNode(ExpressionDefinition expression) {
this.expression = expression;
}
public ExpressionNode(Expression expression) {
if (expression != null) {
setExpression(ExpressionNodeHelper.toExpressionDefinition(expression));
}
}
public ExpressionNode(Predicate predicate) {
if (predicate != null) {
setExpression(ExpressionNodeHelper.toExpressionDefinition(predicate));
}
}
public ExpressionDefinition getExpression() {
return expression;
}
public void setExpression(ExpressionDefinition expression) {
// favour using the helper to set the expression as it can unwrap some unwanted builders when using Java DSL
if (expression instanceof Expression) {
this.expression = ExpressionNodeHelper.toExpressionDefinition((Expression) expression);
} else if (expression instanceof Predicate) {
this.expression = ExpressionNodeHelper.toExpressionDefinition((Predicate) expression);
} else {
this.expression = expression;
}
}
@Override
public List<ProcessorDefinition<?>> getOutputs() {
return outputs;
}
public void setOutputs(List<ProcessorDefinition<?>> outputs) {
this.outputs = outputs;
}
@Override
public boolean isOutputSupported() {
return true;
}
@Override
public String getLabel() {
if (getExpression() == null) {
return "";
}
return getExpression().getLabel();
}
/**
* Creates the {@link FilterProcessor} from the expression node.
*
* @param routeContext the route context
* @return the created {@link FilterProcessor}
* @throws Exception is thrown if error creating the processor
*/
protected FilterProcessor createFilterProcessor(RouteContext routeContext) throws Exception {
Processor childProcessor = createOutputsProcessor(routeContext);
return new FilterProcessor(createPredicate(routeContext), childProcessor);
}
/**
* Creates the {@link Predicate} from the expression node.
*
* @param routeContext the route context
* @return the created predicate
*/
protected Predicate createPredicate(RouteContext routeContext) {
return getExpression().createPredicate(routeContext);
}
@Override
public void configureChild(ProcessorDefinition<?> output) {
// reuse the logic from pre create processor
preCreateProcessor();
}
@Override
protected void preCreateProcessor() {
Expression exp = expression;
if (expression != null && expression.getExpressionValue() != null) {
exp = expression.getExpressionValue();
}
if (exp instanceof ExpressionClause) {
ExpressionClause<?> clause = (ExpressionClause<?>) exp;
if (clause.getExpressionType() != null) {
// if using the Java DSL then the expression may have been set using the
// ExpressionClause which is a fancy builder to define expressions and predicates
// using fluent builders in the DSL. However we need afterwards a callback to
// reset the expression to the expression type the ExpressionClause did build for us
expression = clause.getExpressionType();
}
}
if (expression != null && expression.getExpression() == null) {
// use toString from predicate or expression so we have some information to show in the route model
if (expression.getPredicate() != null) {
expression.setExpression(expression.getPredicate().toString());
} else if (expression.getExpressionValue() != null) {
expression.setExpression(expression.getExpressionValue().toString());
}
}
}
}