/**
* 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.aggregate;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.apache.camel.CamelContext;
import org.apache.camel.Expression;
import org.apache.camel.builder.ExpressionBuilder;
import org.apache.camel.component.bean.ParameterInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Class information about the POJO method to call when using the {@link AggregationStrategyBeanAdapter}.
*/
public class AggregationStrategyBeanInfo {
// TODO: We could potential merge this logic into AggregationStrategyMethodInfo and only have 1 class
private static final Logger LOG = LoggerFactory.getLogger(AggregationStrategyBeanInfo.class);
private final Class<?> type;
private final Method method;
@Deprecated
public AggregationStrategyBeanInfo(CamelContext camelContext, Class<?> type, Method method) {
this(type, method);
}
public AggregationStrategyBeanInfo(Class<?> type, Method method) {
this.type = type;
this.method = method;
}
protected AggregationStrategyMethodInfo createMethodInfo() {
Class<?>[] parameterTypes = method.getParameterTypes();
int size = parameterTypes.length;
if (LOG.isTraceEnabled()) {
LOG.trace("Creating MethodInfo for class: {} method: {} having {} parameters", new Object[]{type, method, size});
}
// must have equal number of parameters
if (size < 2) {
throw new IllegalArgumentException("The method " + method.getName() + " must have at least two parameters, has: " + size);
} else if (size % 2 != 0) {
throw new IllegalArgumentException("The method " + method.getName() + " must have equal number of parameters, has: " + size);
}
// must not have annotations as they are not supported (yet)
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
for (int i = 0; i < parameterAnnotations.length; i++) {
Annotation[] annotations = parameterAnnotations[i];
if (annotations.length > 0) {
throw new IllegalArgumentException("Method parameter annotation: " + annotations[0] + " at index: " + i + " is not supported on method: " + method);
}
}
List<ParameterInfo> oldParameters = new ArrayList<ParameterInfo>();
List<ParameterInfo> newParameters = new ArrayList<ParameterInfo>();
for (int i = 0; i < size / 2; i++) {
Class<?> oldType = parameterTypes[i];
if (oldParameters.size() == 0) {
// the first parameter is the body
Expression oldBody = ExpressionBuilder.mandatoryBodyExpression(oldType);
ParameterInfo info = new ParameterInfo(i, oldType, null, oldBody);
oldParameters.add(info);
} else if (oldParameters.size() == 1) {
// the 2nd parameter is the headers
Expression oldHeaders = ExpressionBuilder.headersExpression();
ParameterInfo info = new ParameterInfo(i, oldType, null, oldHeaders);
oldParameters.add(info);
} else if (oldParameters.size() == 2) {
// the 3rd parameter is the properties
Expression oldProperties = ExpressionBuilder.propertiesExpression();
ParameterInfo info = new ParameterInfo(i, oldType, null, oldProperties);
oldParameters.add(info);
}
}
for (int i = size / 2; i < size; i++) {
Class<?> newType = parameterTypes[i];
if (newParameters.size() == 0) {
// the first parameter is the body
Expression newBody = ExpressionBuilder.mandatoryBodyExpression(newType);
ParameterInfo info = new ParameterInfo(i, newType, null, newBody);
newParameters.add(info);
} else if (newParameters.size() == 1) {
// the 2nd parameter is the headers
Expression newHeaders = ExpressionBuilder.headersExpression();
ParameterInfo info = new ParameterInfo(i, newType, null, newHeaders);
newParameters.add(info);
} else if (newParameters.size() == 2) {
// the 3rd parameter is the properties
Expression newProperties = ExpressionBuilder.propertiesExpression();
ParameterInfo info = new ParameterInfo(i, newType, null, newProperties);
newParameters.add(info);
}
}
return new AggregationStrategyMethodInfo(method, oldParameters, newParameters);
}
}