private MethodInvocation createInvocation(Object pojo, Exchange exchange, Method explicitMethod)
throws AmbiguousMethodCallException, MethodNotFoundException {
MethodInfo methodInfo = null;
// find the explicit method to invoke
if (explicitMethod != null) {
for (List<MethodInfo> infos : operations.values()) {
for (MethodInfo info : infos) {
if (explicitMethod.equals(info.getMethod())) {
return info.createMethodInvocation(pojo, exchange);
}
}
}
throw new MethodNotFoundException(exchange, pojo, explicitMethod.getName());
}
String methodName = exchange.getIn().getHeader(Exchange.BEAN_METHOD_NAME, String.class);
if (methodName != null) {
// do not use qualifier for name
String name = methodName;
if (methodName.contains("(")) {
name = ObjectHelper.before(methodName, "(");
// the must be a ending parenthesis
if (!methodName.endsWith(")")) {
throw new IllegalArgumentException(
"Method should end with parenthesis, was " + methodName);
}
}
boolean emptyParameters = methodName.endsWith("()");
// special for getClass, as we want the user to be able to invoke this method
// for example to log the class type or the likes
if ("class".equals(name) || "getClass".equals(name)) {
try {
Method method = pojo.getClass().getMethod("getClass");
methodInfo =
new MethodInfo(
exchange.getContext(),
pojo.getClass(),
method,
Collections.<ParameterInfo>emptyList(),
Collections.<ParameterInfo>emptyList(),
false,
false);
} catch (NoSuchMethodException e) {
throw new MethodNotFoundException(exchange, pojo, "getClass");
}
// special for length on an array type
} else if ("length".equals(name) && pojo.getClass().isArray()) {
try {
// need to use arrayLength method from ObjectHelper as Camel's bean OGNL support is method
// invocation based
// and not for accessing fields. And hence we need to create a MethodInfo instance with a
// method to call
// and therefore use arrayLength from ObjectHelper to return the array length field.
Method method = ObjectHelper.class.getMethod("arrayLength", Object[].class);
ParameterInfo pi =
new ParameterInfo(
0,
Object[].class,
null,
ExpressionBuilder.mandatoryBodyExpression(Object[].class, true));
List<ParameterInfo> lpi = new ArrayList<ParameterInfo>(1);
lpi.add(pi);
methodInfo =
new MethodInfo(
exchange.getContext(), pojo.getClass(), method, lpi, lpi, false, false);
// Need to update the message body to be pojo for the invocation
exchange.getIn().setBody(pojo);
} catch (NoSuchMethodException e) {
throw new MethodNotFoundException(exchange, pojo, "getClass");
}
} else {
List<MethodInfo> methods = getOperations(name);
if (methods != null && methods.size() == 1) {
// only one method then choose it
methodInfo = methods.get(0);
// validate that if we want an explicit no-arg method, then that's what we get
if (emptyParameters && methodInfo.hasParameters()) {
throw new MethodNotFoundException(exchange, pojo, methodName, "(with no parameters)");
}
} else if (methods != null) {
// there are more methods with that name so we cannot decide which to use
// but first let's try to choose a method and see if that complies with the name
// must use the method name which may have qualifiers
methodInfo = chooseMethod(pojo, exchange, methodName);
// validate that if we want an explicit no-arg method, then that's what we get
if (emptyParameters) {
if (methodInfo == null || methodInfo.hasParameters()) {
// we could not find a no-arg method with that name
throw new MethodNotFoundException(exchange, pojo, methodName, "(with no parameters)");
}
}
if (methodInfo == null
|| (name != null && !name.equals(methodInfo.getMethod().getName()))) {
throw new AmbiguousMethodCallException(exchange, methods);
}
} else {
// a specific method was given to invoke but not found
throw new MethodNotFoundException(exchange, pojo, methodName);
}
}
}
if (methodInfo == null) {
// no name or type
methodInfo = chooseMethod(pojo, exchange, null);
}
if (methodInfo == null) {
methodInfo = defaultMethod;
}
if (methodInfo != null) {
LOG.trace("Chosen method to invoke: {} on bean: {}", methodInfo, pojo);
return methodInfo.createMethodInvocation(pojo, exchange);
}
LOG.debug("Cannot find suitable method to invoke on bean: {}", pojo);
return null;
}
