org.coliper.ibean.util

Class ReflectionUtil

java.lang.Object

org.coliper.ibean.util.ReflectionUtil

public class ReflectionUtil
extends Object

Contains static helper methods related to classes and reflection.

Method Summary

Modifier and Type	Method and Description
static boolean	areClassesRelated(Class<?> type1, Class<?> type2) Determines if two classes are linked in a class hierarchy.
static boolean	doesMethodBelongToType(Method method, Class<?> type) Checks if method belongs to a given type or super-type.
static List<Class<?>>	getSuperTypesInclRoot(Class<?> rootType) Collects all classes and interfaces a given type extends or implements.
static Object	invokeMethodUnchecked(Object object, Method method) Calls Method.invoke(Object, Object...) on the given method but catches away all thrown Exceptions.
static <T> Method	lookupInterfaceMethod(Class<T> interfaceType, Consumer<T> methodSpecifier)
static Object	primitiveTypeDefaultValue(Class<?> primitiveType) Returnes the default value for a given primitive type, basically all flavours of zero for the number types and false for boolean.class.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

areClassesRelated

public static boolean areClassesRelated(Class<?> type1,
                                        Class<?> type2)

Determines if two classes are linked in a class hierarchy.

Parameters:

type1 - a class or null

type2 - the class to compare type1 with or null

Returns:

true if both classes are identical or if one type is base class of other. false if one of the given types or both are null or not in a direct hierarchical relation.

doesMethodBelongToType

public static boolean doesMethodBelongToType(Method method,
                                             Class<?> type)

Checks if method belongs to a given type or super-type.

Parameters:

method - the method to check

type - any class to search for the given method

Returns:

true if given method is declared in given type or one of its super types.

invokeMethodUnchecked

public static Object invokeMethodUnchecked(Object object,
                                           Method method)

Calls Method.invoke(Object, Object...) on the given method but catches away all thrown Exceptions.

Parameters:

object - the object the method to call on. Can be null for static methods

method - the method to execute

Returns:

the value returned from method call

Throws:

RuntimeException - wrapped around the checked exception from the method invocation

getSuperTypesInclRoot

public static List<Class<?>> getSuperTypesInclRoot(Class<?> rootType)

Collects all classes and interfaces a given type extends or implements. This methods executes fast as its results are cached.

Parameters:

rootType - the class to examine

Returns:

an immutable list of super classes and interfaces including the given type but excluding Object

lookupInterfaceMethod

public static <T> Method lookupInterfaceMethod(Class<T> interfaceType,
                                               Consumer<T> methodSpecifier)

primitiveTypeDefaultValue

public static Object primitiveTypeDefaultValue(Class<?> primitiveType)

Returnes the default value for a given primitive type, basically all flavours of zero for the number types and false for boolean.class.

Parameters:

primitiveType - a Java primitive type like boolean.class, int.class or float.class

Returns:

zero of false value of type matching to given primitiveType. If for example primitiveType is double.class the returned value will have type Double.class and value 0.0.