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Invocation.java
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Invocation.java
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/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* Licensed 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.switchyard.component.bean;
import org.switchyard.Exchange;
import org.switchyard.Message;
import java.lang.reflect.Method;
/**
* Bean component invocation details.
*
* @author <a href="mailto:tom.fennelly@gmail.com">tom.fennelly@gmail.com</a>
*/
public class Invocation {
/**
* The method/operation being invoked.
*/
private Method _method;
/**
* The exchange instance.
*/
private Exchange _exchange;
/**
* The invocation arguments.
*/
private Object[] _args;
/**
* Constructor.
*
* @param method The method/operation being invoked.
* @param exchange The exchange instance.
* @throws BeanComponentException Unsupported method structure, or type mismatch.
*/
Invocation(Method method, Exchange exchange) throws BeanComponentException {
this._method = method;
this._exchange = exchange;
this._args = castArg(method, exchange.getMessage());
assertOK();
}
/**
* Assert that the exchange payload type(s) and the bean method
* argument type(s) match.
*/
private void assertOK() throws BeanComponentException {
assertMethodStructureSupported();
assertTypesMatch();
}
/**
* Get the invocation arguments.
*
* @return The invocation arguments.
*/
public Object[] getArgs() {
return _args;
}
/**
* Get the method/operation being invoked.
*
* @return The method/operation being invoked.
*/
public Method getMethod() {
return _method;
}
private static Object[] castArg(Method method, Message message) {
if (method.getParameterTypes().length == 1 && message != null) {
return new Object[]{message.getContent(method.getParameterTypes()[0])};
}
return null;
}
private void assertMethodStructureSupported() throws BeanComponentException {
Class<?>[] parameterTypes = _method.getParameterTypes();
// TODO: Only supports 0 or 1 arg operations for now...
if (parameterTypes.length > 1) {
throw BeanMessages.MESSAGES.beanServiceOperationMoreThanOne(operationName());
}
}
private void assertTypesMatch() throws BeanComponentException {
if (_args == null) {
if (_method.getParameterTypes().length != 0) {
throw BeanMessages.MESSAGES.beanServiceOperationRequiresSingle(operationName());
}
} else {
if (_args.length > 1) {
throw BeanMessages.MESSAGES.beanServiceOperationSupportsSingle(operationName(), Integer.toString(_args.length));
}
if (_args[0] != null) {
Class<?> argType = _method.getParameterTypes()[0];
if (!argType.isInstance(_args[0])) {
throw BeanMessages.MESSAGES.beanServiceOperationRequiresAPayloadTypeOf(operationName(), argType.getName(), _args[0].getClass().getName());
}
}
}
}
private String operationName() {
return _exchange.getProvider().getName() + "#" + _method.getName();
}
}