public class MethodUtils extends Object
Utility reflection methods focused on Method
s, originally from Commons BeanUtils.
Differences from the BeanUtils version may be noted, especially where similar functionality
already existed within Lang.
There is an issue when invoking public
methods contained in a default access superclass on JREs prior to 1.4.
Reflection locates these methods fine and correctly assigns them as public
.
However, an IllegalAccessException
is thrown if the method is invoked.
MethodUtils
contains a workaround for this situation.
It will attempt to call AccessibleObject.setAccessible(boolean)
on this method.
If this call succeeds, then the method can be invoked as normal.
This call will only succeed when the application has sufficient security privileges.
If this call fails then the method may fail.
Constructor and Description |
---|
MethodUtils()
MethodUtils instances should NOT be constructed in standard programming. |
Modifier and Type | Method and Description |
---|---|
static Method |
getAccessibleMethod(Class<?> cls,
String methodName,
Class<?>... parameterTypes)
Returns an accessible method (that is, one that can be invoked via
reflection) with given name and parameters.
|
static Method |
getAccessibleMethod(Method method)
Returns an accessible method (that is, one that can be invoked via
reflection) that implements the specified Method.
|
static Method |
getMatchingAccessibleMethod(Class<?> cls,
String methodName,
Class<?>... parameterTypes)
Finds an accessible method that matches the given name and has compatible parameters.
|
static List<Method> |
getMethodsListWithAnnotation(Class<?> cls,
Class<? extends Annotation> annotationCls)
Gets all methods of the given class that are annotated with the given annotation.
|
static Method[] |
getMethodsWithAnnotation(Class<?> cls,
Class<? extends Annotation> annotationCls)
Gets all methods of the given class that are annotated with the given annotation.
|
static Set<Method> |
getOverrideHierarchy(Method method,
ClassUtils.Interfaces interfacesBehavior)
Get the hierarchy of overridden methods down to
result respecting generics. |
static Object |
invokeExactMethod(Object object,
String methodName)
Invokes a method whose parameter types match exactly the object
types.
|
static Object |
invokeExactMethod(Object object,
String methodName,
Object... args)
Invokes a method with no parameters.
|
static Object |
invokeExactMethod(Object object,
String methodName,
Object[] args,
Class<?>[] parameterTypes)
Invokes a method whose parameter types match exactly the parameter
types given.
|
static Object |
invokeExactStaticMethod(Class<?> cls,
String methodName,
Object... args)
Invokes a
static method whose parameter types match exactly the object
types. |
static Object |
invokeExactStaticMethod(Class<?> cls,
String methodName,
Object[] args,
Class<?>[] parameterTypes)
Invokes a
static method whose parameter types match exactly the parameter
types given. |
static Object |
invokeMethod(Object object,
String methodName)
Invokes a named method without parameters.
|
static Object |
invokeMethod(Object object,
String methodName,
Object... args)
Invokes a named method whose parameter type matches the object type.
|
static Object |
invokeMethod(Object object,
String methodName,
Object[] args,
Class<?>[] parameterTypes)
Invokes a named method whose parameter type matches the object type.
|
static Object |
invokeStaticMethod(Class<?> cls,
String methodName,
Object... args)
Invokes a named
static method whose parameter type matches the object type. |
static Object |
invokeStaticMethod(Class<?> cls,
String methodName,
Object[] args,
Class<?>[] parameterTypes)
Invokes a named
static method whose parameter type matches the object type. |
public MethodUtils()
MethodUtils
instances should NOT be constructed in standard programming.
Instead, the class should be used as
MethodUtils.getAccessibleMethod(method)
.
This constructor is public
to permit tools that require a JavaBean
instance to operate.
public static Object invokeMethod(Object object, String methodName) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a named method without parameters.
This method delegates the method search to getMatchingAccessibleMethod(Class, String, Class[])
.
This is a convenient wrapper for
invokeMethod(Object object,String methodName, Object[] args, Class[] parameterTypes)
.
object
- invoke method on this objectmethodName
- get method with this nameNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the method invokedIllegalAccessException
- if the requested method is not accessible via reflectionpublic static Object invokeMethod(Object object, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a named method whose parameter type matches the object type.
This method delegates the method search to getMatchingAccessibleMethod(Class, String, Class[])
.
This method supports calls to methods taking primitive parameters
via passing in wrapping classes. So, for example, a Boolean
object
would match a boolean
primitive.
This is a convenient wrapper for
invokeMethod(Object object,String methodName, Object[] args, Class[] parameterTypes)
.
object
- invoke method on this objectmethodName
- get method with this nameargs
- use these arguments - treat null as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the method invokedIllegalAccessException
- if the requested method is not accessible via reflectionpublic static Object invokeMethod(Object object, String methodName, Object[] args, Class<?>[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a named method whose parameter type matches the object type.
This method delegates the method search to getMatchingAccessibleMethod(Class, String, Class[])
.
This method supports calls to methods taking primitive parameters
via passing in wrapping classes. So, for example, a Boolean
object
would match a boolean
primitive.
object
- invoke method on this objectmethodName
- get method with this nameargs
- use these arguments - treat null as empty arrayparameterTypes
- match these parameters - treat null as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the method invokedIllegalAccessException
- if the requested method is not accessible via reflectionpublic static Object invokeExactMethod(Object object, String methodName) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a method whose parameter types match exactly the object types.
This uses reflection to invoke the method obtained from a call to
getAccessibleMethod(java.lang.Class<?>, java.lang.String, java.lang.Class<?>...)
(Class,String,Class[])}.
object
- invoke method on this objectmethodName
- get method with this nameNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Object invokeExactMethod(Object object, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a method with no parameters.
This uses reflection to invoke the method obtained from a call to
getAccessibleMethod(java.lang.Class<?>, java.lang.String, java.lang.Class<?>...)
(Class,String,Class[])}.
object
- invoke method on this objectmethodName
- get method with this nameargs
- use these arguments - treat null as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Object invokeExactMethod(Object object, String methodName, Object[] args, Class<?>[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a method whose parameter types match exactly the parameter types given.
This uses reflection to invoke the method obtained from a call to
getAccessibleMethod(Class,String,Class[])
.
object
- invoke method on this objectmethodName
- get method with this nameargs
- use these arguments - treat null as empty arrayparameterTypes
- match these parameters - treat null
as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Object invokeExactStaticMethod(Class<?> cls, String methodName, Object[] args, Class<?>[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a static
method whose parameter types match exactly the parameter
types given.
This uses reflection to invoke the method obtained from a call to
getAccessibleMethod(Class, String, Class[])
.
cls
- invoke static method on this classmethodName
- get method with this nameargs
- use these arguments - treat null
as empty arrayparameterTypes
- match these parameters - treat null
as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Object invokeStaticMethod(Class<?> cls, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a named static
method whose parameter type matches the object type.
This method delegates the method search to getMatchingAccessibleMethod(Class, String, Class[])
.
This method supports calls to methods taking primitive parameters
via passing in wrapping classes. So, for example, a Boolean
class
would match a boolean
primitive.
This is a convenient wrapper for
invokeStaticMethod(Class, String, Object[], Class[])
.
cls
- invoke static method on this classmethodName
- get method with this nameargs
- use these arguments - treat null
as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Object invokeStaticMethod(Class<?> cls, String methodName, Object[] args, Class<?>[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a named static
method whose parameter type matches the object type.
This method delegates the method search to getMatchingAccessibleMethod(Class, String, Class[])
.
This method supports calls to methods taking primitive parameters
via passing in wrapping classes. So, for example, a Boolean
class
would match a boolean
primitive.
cls
- invoke static method on this classmethodName
- get method with this nameargs
- use these arguments - treat null
as empty arrayparameterTypes
- match these parameters - treat null
as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Object invokeExactStaticMethod(Class<?> cls, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
Invokes a static
method whose parameter types match exactly the object
types.
This uses reflection to invoke the method obtained from a call to
getAccessibleMethod(Class, String, Class[])
.
cls
- invoke static method on this classmethodName
- get method with this nameargs
- use these arguments - treat null
as empty arrayNoSuchMethodException
- if there is no such accessible methodInvocationTargetException
- wraps an exception thrown by the
method invokedIllegalAccessException
- if the requested method is not accessible
via reflectionpublic static Method getAccessibleMethod(Class<?> cls, String methodName, Class<?>... parameterTypes)
Returns an accessible method (that is, one that can be invoked via
reflection) with given name and parameters. If no such method
can be found, return null
.
This is just a convenience wrapper for
getAccessibleMethod(Method)
.
cls
- get method from this classmethodName
- get method with this nameparameterTypes
- with these parameters typespublic static Method getAccessibleMethod(Method method)
Returns an accessible method (that is, one that can be invoked via
reflection) that implements the specified Method. If no such method
can be found, return null
.
method
- The method that we wish to callpublic static Method getMatchingAccessibleMethod(Class<?> cls, String methodName, Class<?>... parameterTypes)
Finds an accessible method that matches the given name and has compatible parameters. Compatible parameters mean that every method parameter is assignable from the given parameters. In other words, it finds a method with the given name that will take the parameters given.
This method is used by
invokeMethod(Object object, String methodName, Object[] args, Class[] parameterTypes)
.
This method can match primitive parameter by passing in wrapper classes.
For example, a Boolean
will match a primitive boolean
parameter.
cls
- find method in this classmethodName
- find method with this nameparameterTypes
- find method with most compatible parameterspublic static Set<Method> getOverrideHierarchy(Method method, ClassUtils.Interfaces interfacesBehavior)
result
respecting generics.method
- lowest to considerinterfacesBehavior
- whether to search interfaces, null
implies
falseNullPointerException
- if the specified method is null
public static Method[] getMethodsWithAnnotation(Class<?> cls, Class<? extends Annotation> annotationCls)
cls
- the Class
to queryannotationCls
- the Annotation
that must be present on a method to be matchedIllegalArgumentException
- if the class or annotation are null
public static List<Method> getMethodsListWithAnnotation(Class<?> cls, Class<? extends Annotation> annotationCls)
cls
- the Class
to queryannotationCls
- the Annotation
that must be present on a method to be matchedIllegalArgumentException
- if the class or annotation are null
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