Java Utililty Methods Reflection Method Return

List of utility methods to do Reflection Method Return

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Description

The list of methods to do Reflection Method Return are organized into topic(s).

Method

ClassgetMethodGenericReturnType(Method method, int index)
get Method Generic Return Type 
Type returnType = method.getGenericReturnType();
if (returnType instanceof ParameterizedType) {
    ParameterizedType type = (ParameterizedType) returnType;
    Type[] typeArguments = type.getActualTypeArguments();
    if (index >= typeArguments.length || index < 0) {
        throw new IllegalArgumentException("index " + (index < 0 ? " must > 0 " : " over total arguments"));
    return (Class) typeArguments[index];
...
FunctiongetMethodInvoker(final Class returnType, final String methodName)
get Method Invoker 
return new Function<Object, T>() {
    public T apply(Object from) {
        if (from == null)
            return null;
        try {
            Method method = from.getClass().getMethod(methodName, new Class[0]);
            return returnType.cast(method.invoke(from, new Object[0]));
        } catch (SecurityException e) {
...
MethodgetMethodNoArgs(final Class objClass, final String methodName, final Class... returnTypePreference)
Direct getMethod attempt. 
try {
    final Method methodFound = objClass.getMethod(methodName);
    if (methodFound != null) {
        if (returnTypePreference == null || returnTypePreference.length == 0) {
            return methodFound;
        final Class<?> returnType = methodFound.getReturnType();
        for (int i = 0; i < returnTypePreference.length; i++) {
...
ClassgetMethodReturnType(Class clazz, String methodName)
Returns return type of given method in given class. 
try {
    Method method = clazz.getDeclaredMethod(methodName);
    return method.getReturnType();
} catch (NoSuchMethodException e) {
    throw new AssertionError(e);
} catch (SecurityException e) {
    throw new AssertionError(e);
ClassgetMethodReturnType(Class clazz, String name)
Returns a Class object that identifies the declared class as a return type for the method represented by the given String name parameter inside the invoked Class clazz parameter. 
if (clazz == null || name == null || name.isEmpty()) {
    return null;
name = name.toLowerCase();
Class<?> returnType = null;
for (Method method : clazz.getDeclaredMethods()) {
    if (method.getName().equals(name)) {
        returnType = method.getReturnType();
...
ClassgetMethodReturnType(Class clazz, String name)
get Method Return Type 
if (clazz == null || name == null || name.isEmpty()) {
    return null;
name = name.toLowerCase();
Class<?> returnType = null;
for (Method method : clazz.getDeclaredMethods()) {
    if (method.getName().equals(name)) {
        returnType = method.getReturnType();
...