ReflectionUtils (Axon Framework 4.4 API)

java.lang.Object
- org.axonframework.common.ReflectionUtils

```
public abstract class ReflectionUtils
extends Object
```
Utility class for working with Java Reflection API.

Since:

0.7

Author:

Allard Buijze

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static Class<?>`	`declaringClass(Class<?> instanceClass, String methodName, Class<?>... parameterTypes)` Returns the class on which the method with given `methodName` and parameters of type `parameterTypes` is declared.
`static <T extends AccessibleObject> T`	`ensureAccessible(T member)` Makes the given `member` accessible via reflection if it is not the case already.
`static boolean`	`explicitlyUnequal(Object value, Object otherValue)` Indicates whether the two given objects are not the same, override an equals method that indicates they are not equal, or implements `Comparable` which indicates the two are not equal.
`static Iterable<Field>`	`fieldsOf(Class<?> clazz)` Returns an `Iterable` of all the fields declared on the given class and its super classes.
`static <R> R`	`getFieldValue(Field field, Object object)` Returns the value of the given `field` in the given `object`.
`static String`	`getMemberGenericString(Member member)` Returns the generic string of the given `member`.
`static Type`	`getMemberGenericType(Member member)` Returns the generic type of value of the given `member`, either by returning the generic type of `Field` or generic return type of a `Method`.
`static <R> R`	`getMemberValue(Member member, Object target)` Returns the value of the given `member` in the given `object`, either by returning `Field` value or invoking the method.
`static Class<?>`	`getMemberValueType(Member member)` Returns the type of value of the given `member`, either by returning the type of `Field` or type of the return value of a `Method`.
`static boolean`	`hasEqualsMethod(Class<?> type)` Indicates whether the given class implements a customized equals method.
`static <R> R`	`invokeAndGetMethodValue(Method method, Object object)` Invokes and returns the return value of the given `method` in the given `object`.
`static boolean`	`isAccessible(AccessibleObject member)` Indicates whether the given `member` is accessible.
`static boolean`	`isNonFinalPublicMember(Member member)` Checks whether the given `member` is public and non-final.
`static boolean`	`isTransient(Field field)` Indicates whether the given field has the "transient" modifier
`static Method`	`methodOf(Class<?> clazz, String methodName, Class<?>... parameterTypes)` Utility function which returns a `Method` matching the given `methodName` and `parameterTypes` in the `clazz`.
`static Iterable<Method>`	`methodsOf(Class<?> clazz)` Returns an `Iterable` of all the methods declared on the given class and its super classes.
`static Optional<Class<?>>`	`resolveGenericType(Field field, int genericTypeIndex)` Resolve a generic type parameter from a field declaration
`static Optional<Class<?>>`	`resolveMemberGenericType(Member member, int genericTypeIndex)` Resolve a generic type parameter from a member declaration.
`static Class<?>`	`resolvePrimitiveWrapperType(Class<?> primitiveType)` Returns the boxed wrapper type for the given `primitiveType`.
`static Type`	`resolvePrimitiveWrapperTypeIfPrimitive(Type type)` Returns the boxed wrapper type for the given `type` if it is primitive.
`static <T> void`	`setFieldValue(Field field, Object object, T value)` Set the `field` of `object` to a certain `value`.
`static Type`	`unwrapIfType(Type type, Class<?>... wrapperTypes)` Unwrap the given `type` if is wrapped by any of the given `wrapperTypes`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getFieldValue
```
public static <R> R getFieldValue(Field field,
                                  Object object)
```
    Returns the value of the given field in the given object. If necessary, the field is made accessible, assuming the security manager allows it.
    
    Parameters:
    
    field - The field containing the value
    
    object - The object to retrieve the field's value from
    
    Returns:
    
    the value of the field in the object
    
    Throws:
    
    IllegalStateException - if the field is not accessible and the security manager doesn't allow it to be made accessible
  - setFieldValue
```
public static <T> void setFieldValue(Field field,
                                     Object object,
                                     T value)
```
    Set the field of object to a certain value. If necessary, the field is made accessible, assuming the security manager allows it.
    
    Type Parameters:
    
    T - The type of the value
    
    Parameters:
    
    field - The field to set value on
    
    object - The object to set the value on field
    
    value - The value to set on field
  - declaringClass
```
public static Class<?> declaringClass(Class<?> instanceClass,
                                      String methodName,
                                      Class<?>... parameterTypes)
```
    Returns the class on which the method with given methodName and parameters of type parameterTypes is declared. The given instanceClass is the instance on which the method can be called. If the method is not available on the given instanceClass, null is returned.
    
    Parameters:
    
    instanceClass - The class on which to look for the method
    
    methodName - The name of the method
    
    parameterTypes - The parameter types of the method
    
    Returns:
    
    The class on which the method is declared, or null if not found
  - hasEqualsMethod
```
public static boolean hasEqualsMethod(Class<?> type)
```
    Indicates whether the given class implements a customized equals method. This methods returns true if the declaring type of the equals method is not Object.
    
    Parameters:
    
    type - The type to inspect
    
    Returns:
    
    true if the given type overrides the equals method, otherwise false
  - explicitlyUnequal
```
public static boolean explicitlyUnequal(Object value,
                                        Object otherValue)
```
    Indicates whether the two given objects are not the same, override an equals method that indicates they are not equal, or implements Comparable which indicates the two are not equal. If this method cannot safely indicate two objects are not equal, it returns false.
    
    Parameters:
    
    value - One of the values to compare
    
    otherValue - other value to compare
    
    Returns:
    
    true if these objects explicitly indicate they are not equal, false otherwise.
  - ensureAccessible
```
public static <T extends AccessibleObject> T ensureAccessible(T member)
```
    Makes the given member accessible via reflection if it is not the case already.
    
    Type Parameters:
    
    T - The type of member to make accessible
    
    Parameters:
    
    member - The member (field, method, constructor, etc) to make accessible
    
    Returns:
    
    the given member, for easier method chaining
    
    Throws:
    
    IllegalStateException - if the member is not accessible and the security manager doesn't allow it to be made accessible
  - isAccessible
```
public static boolean isAccessible(AccessibleObject member)
```
    Indicates whether the given member is accessible. It does so by checking whether the member is non-final and public, or made accessible via reflection.
    
    Parameters:
    
    member - The member (field, method, constructor, etc) to check for accessibility
    
    Returns:
    
    true if the member is accessible, otherwise false.
  - isNonFinalPublicMember
```
public static boolean isNonFinalPublicMember(Member member)
```
    Checks whether the given member is public and non-final. These members do no need to be set accessible using reflection.
    
    Parameters:
    
    member - The member to check
    
    Returns:
    
    true if the member is public and non-final, otherwise false.
    
    See Also:
    
    isAccessible(java.lang.reflect.AccessibleObject), ensureAccessible(java.lang.reflect.AccessibleObject)
  - fieldsOf
```
public static Iterable<Field> fieldsOf(Class<?> clazz)
```
    Returns an Iterable of all the fields declared on the given class and its super classes. The iterator will always return fields declared in a subtype before returning fields declared in a super type.
    
    Parameters:
    
    clazz - The class to return fields for
    
    Returns:
    
    an Iterable providing access to all declared fields in the class hierarchy
  - methodOf
```
public static Method methodOf(Class<?> clazz,
                              String methodName,
                              Class<?>... parameterTypes)
                       throws NoSuchMethodException
```
    Utility function which returns a Method matching the given methodName and parameterTypes in the clazz.
    
    Parameters:
    
    clazz - The Class to return a method for
    
    methodName - A String for the simple name of the method to return
    
    parameterTypes - An array of type Class for all the parameters which are part of the Method being searched for
    
    Returns:
    
    a Method object from the given clazz matching the specified methodName
    
    Throws:
    
    NoSuchMethodException - if no Method can be found matching the methodName in clazz
  - methodsOf
```
public static Iterable<Method> methodsOf(Class<?> clazz)
```
    Returns an Iterable of all the methods declared on the given class and its super classes. The iterator will always return methods declared in a subtype before returning methods declared in a super type.
    
    Parameters:
    
    clazz - The class to return methods for
    
    Returns:
    
    an Iterable providing access to all declared methods in the class hierarchy
  - resolvePrimitiveWrapperType
```
public static Class<?> resolvePrimitiveWrapperType(Class<?> primitiveType)
```
    Returns the boxed wrapper type for the given primitiveType.
    
    Parameters:
    
    primitiveType - The primitive type to return boxed wrapper type for
    
    Returns:
    
    the boxed wrapper type for the given primitiveType
    
    Throws:
    
    IllegalArgumentException - will be thrown instead of returning null if no wrapper class was found.
  - resolvePrimitiveWrapperTypeIfPrimitive
```
public static Type resolvePrimitiveWrapperTypeIfPrimitive(Type type)
```
    Returns the boxed wrapper type for the given type if it is primitive.
    
    Parameters:
    
    type - a Type to return boxed wrapper type for
    
    Returns:
    
    the boxed wrapper type for the give type, or type if no wrapper class was found.
  - unwrapIfType
```
public static Type unwrapIfType(Type type,
                                Class<?>... wrapperTypes)
```
    Unwrap the given type if is wrapped by any of the given wrapperTypes. This method assumes that the wrapperTypes have a single generic argument, which identifies the type they wrap.
    For example, if invoked with Future.class and Optional.class as wrapperTypes:
    - Future<String> resolves to String
    - Optional<String> resolves to String
    - Optional<Future<List<String>>> resolves to List<String>
    Parameters:
    
    type - The type to unwrap, if wrapped
    
    wrapperTypes - The wrapper types to unwrap
    
    Returns:
    
    the unwrapped Type, or the original if it wasn't wrapped in any of the given wrapper types
  - isTransient
```
public static boolean isTransient(Field field)
```
    Indicates whether the given field has the "transient" modifier
    
    Parameters:
    
    field - the field to inspect
    
    Returns:
    
    true if the field is marked transient, otherwise false
  - resolveGenericType
```
public static Optional<Class<?>> resolveGenericType(Field field,
                                                    int genericTypeIndex)
```
    Resolve a generic type parameter from a field declaration
    
    Parameters:
    
    field - The field to find generic parameters for
    
    genericTypeIndex - The index of the type
    
    Returns:
    
    an optional that contains the resolved type, if found
  - resolveMemberGenericType
```
public static Optional<Class<?>> resolveMemberGenericType(Member member,
                                                          int genericTypeIndex)
```
    Resolve a generic type parameter from a member declaration.
    
    Parameters:
    
    member - the member to find generic parameters for
    
    genericTypeIndex - the index of the type
    
    Returns:
    
    an optional that contains the resolved type, if found
  - invokeAndGetMethodValue
```
public static <R> R invokeAndGetMethodValue(Method method,
                                            Object object)
```
    Invokes and returns the return value of the given method in the given object. If necessary, the method is made accessible, assuming the security manager allows it.
    
    Parameters:
    
    method - the method to invoke
    
    object - the target object the given method is invoked on
    
    Returns:
    
    the resulting value of invocation of the method in the object
    
    Throws:
    
    IllegalStateException - if the method is not accessible and the security manager doesn't allow it to be made accessible
  - getMemberValue
```
public static <R> R getMemberValue(Member member,
                                   Object target)
```
    Returns the value of the given member in the given object, either by returning Field value or invoking the method. If necessary, the member is made accessible, assuming the security manager allows it. Supported members are Field and non-void Method without parameters.
    
    Parameters:
    
    member - the member containing or returning the value
    
    target - the object to retrieve the member's value from
    
    Returns:
    
    the value of the member in the object
    
    Throws:
    
    IllegalStateException - if the member is not supported
  - getMemberValueType
```
public static Class<?> getMemberValueType(Member member)
```
    Returns the type of value of the given member, either by returning the type of Field or type of the return value of a Method.
    
    Parameters:
    
    member - the member to get the value type from
    
    Returns:
    
    the type of value of the member
    
    Throws:
    
    IllegalStateException - if the member is not supported
  - getMemberGenericType
```
public static Type getMemberGenericType(Member member)
```
    Returns the generic type of value of the given member, either by returning the generic type of Field or generic return type of a Method.
    
    Parameters:
    
    member - the member to get generic type of
    
    Returns:
    
    the generic type of value of the member
    
    Throws:
    
    IllegalStateException - if the member is not supported
  - getMemberGenericString
```
public static String getMemberGenericString(Member member)
```
    Returns the generic string of the given member.
    
    Parameters:
    
    member - the member to get the generic string for
    
    Returns:
    
    the generic string of the member
    
    Throws:
    
    IllegalStateException - if the member is not supported

Class ReflectionUtils

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getFieldValue

setFieldValue

declaringClass

hasEqualsMethod

explicitlyUnequal

ensureAccessible

isAccessible

isNonFinalPublicMember

fieldsOf

methodOf

methodsOf

resolvePrimitiveWrapperType

resolvePrimitiveWrapperTypeIfPrimitive

unwrapIfType

isTransient

resolveGenericType

resolveMemberGenericType

invokeAndGetMethodValue

getMemberValue

getMemberValueType

getMemberGenericType

getMemberGenericString