@SuppressWarnings("unchecked")
public <T> T evaluate(Exchange exchange, Class<T> type) {
Object body = exchange.getIn().getBody();
boolean multiParameterArray = false;
if (exchange.getIn().getHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY) != null) {
multiParameterArray =
exchange.getIn().getHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY, Boolean.class);
if (multiParameterArray) {
// Just change the message body to an Object array
if (!(body instanceof Object[])) {
body = exchange.getIn().getBody(Object[].class);
}
}
}
// if there was an explicit method name to invoke, then we should support using
// any provided parameter values in the method name
String methodName = exchange.getIn().getHeader(Exchange.BEAN_METHOD_NAME, "", String.class);
// the parameter values is between the parenthesis
String methodParameters = ObjectHelper.betweenOuterPair(methodName, '(', ')');
// use an iterator to walk the parameter values
Iterator<?> it = null;
if (methodParameters != null) {
// split the parameters safely separated by comma, but beware that we can have
// quoted parameters which contains comma as well, so do a safe quote split
String[] parameters = StringQuoteHelper.splitSafeQuote(methodParameters, ',', true);
it = ObjectHelper.createIterator(parameters, ",", true);
}
// remove headers as they should not be propagated
// we need to do this before the expressions gets evaluated as it may contain
// a @Bean expression which would by mistake read these headers. So the headers
// must be removed at this point of time
exchange.getIn().removeHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY);
exchange.getIn().removeHeader(Exchange.BEAN_METHOD_NAME);
Object[] answer = evaluateParameterExpressions(exchange, body, multiParameterArray, it);
return (T) answer;
}
private boolean matchMethod(Method method, String methodName) {
if (methodName == null) {
return true;
}
if (methodName.contains("(") && !methodName.endsWith(")")) {
throw new IllegalArgumentException(
"Name must have both starting and ending parenthesis, was: " + methodName);
}
// do not use qualifier for name matching
String name = methodName;
if (name.contains("(")) {
name = ObjectHelper.before(name, "(");
}
// must match name
if (name != null && !name.equals(method.getName())) {
return false;
}
// is it a method with no parameters
boolean noParameters = methodName.endsWith("()");
if (noParameters) {
return method.getParameterTypes().length == 0;
}
// match qualifier types which is used to select among overloaded methods
String types = ObjectHelper.between(methodName, "(", ")");
if (ObjectHelper.isNotEmpty(types)) {
// we must qualify based on types to match method
String[] parameters = StringQuoteHelper.splitSafeQuote(types, ',');
Iterator<?> it = ObjectHelper.createIterator(parameters);
for (int i = 0; i < method.getParameterTypes().length; i++) {
if (it.hasNext()) {
Class<?> parameterType = method.getParameterTypes()[i];
String qualifyType = (String) it.next();
if (ObjectHelper.isEmpty(qualifyType)) {
continue;
}
// trim the type
qualifyType = qualifyType.trim();
if ("*".equals(qualifyType)) {
// * is a wildcard so we accept and match that parameter type
continue;
}
if (BeanHelper.isValidParameterValue(qualifyType)) {
// its a parameter value, so continue to next parameter
// as we should only check for FQN/type parameters
continue;
}
// if qualify type indeed is a class, then it must be assignable with the parameter type
Boolean assignable =
BeanHelper.isAssignableToExpectedType(
getCamelContext().getClassResolver(), qualifyType, parameterType);
// the method will return null if the qualifyType is not a class
if (assignable != null && !assignable) {
return false;
}
} else {
// there method has more parameters than was specified in the method name qualifiers
return false;
}
}
// if the method has no more types then we can only regard it as matched
// if there are no more qualifiers
if (it.hasNext()) {
return false;
}
}
// the method matched
return true;
}