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/*
* Copyright 2008 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.powermock.reflect;
import org.powermock.reflect.exceptions.ConstructorNotFoundException;
import org.powermock.reflect.exceptions.FieldNotFoundException;
import org.powermock.reflect.exceptions.MethodNotFoundException;
import org.powermock.reflect.exceptions.TooManyMethodsFoundException;
import org.powermock.reflect.internal.WhiteboxImpl;
import org.powermock.reflect.matching.FieldMatchingStrategy;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Set;
/**
* Various utilities for accessing internals of a class. Basically a simplified
* reflection utility intended for tests.
*/
public class Whitebox {
/**
* Convenience method to get a field from a class type.
*
* The method will first try to look for a declared field in the same class.
* If the field is not declared in this class it will look for the field in
* the super class. This will continue throughout the whole class hierarchy.
* If the field is not found an {@link IllegalArgumentException} is thrown.
*
* @param type
* The type of the class where the method is located.
* @param fieldName
* The method names.
* @return A java.lang.reflect.Field.
* @throws FieldNotFoundException
* If a field cannot be found in the hierarchy.
*/
public static Field getField(Class type, String fieldName) {
return WhiteboxImpl.getField(type, fieldName);
}
/**
* Get an array of {@link Field}'s that matches the supplied list of field
* names.
*
* @param clazz
* The class that should contain the fields.
* @param fieldNames
* The names of the fields that will be returned.
* @return An array of Field's. May be of length 0 but not null
*
*/
public static Field[] getFields(Class clazz, String... fieldNames) {
return WhiteboxImpl.getFields(clazz, fieldNames);
}
/**
* Convenience method to get a method from a class type without having to
* catch the checked exceptions otherwise required. These exceptions are
* wrapped as runtime exceptions.
*
* The method will first try to look for a declared method in the same
* class. If the method is not declared in this class it will look for the
* method in the super class. This will continue throughout the whole class
* hierarchy. If the method is not found an {@link IllegalArgumentException}
* is thrown.
*
* @param type
* The type of the class where the method is located.
* @param methodName
* The method names.
* @param parameterTypes
* All parameter types of the method (may be null).
* @return A java.lang.reflect.Method.
* @throws MethodNotFoundException
* If a method cannot be found in the hierarchy.
*/
public static Method getMethod(Class type, String methodName, Class... parameterTypes) {
return WhiteboxImpl.getMethod(type, methodName, parameterTypes);
}
/**
* Convenience method to get a method from a class type without having to
* catch the checked exceptions otherwise required. These exceptions are
* wrapped as runtime exceptions.
*
* The method will first try to look for a declared method in the same
* class. If the method is not declared in this class it will look for the
* method in the super class. This will continue throughout the whole class
* hierarchy. If the method is not found an {@link MethodNotFoundException}
* is thrown. Since the method name is not specified an
* {@link TooManyMethodsFoundException} is thrown if two or more methods
* matches the same parameter types in the same class.
*
* @param type
* The type of the class where the method is located.
* @param parameterTypes
* All parameter types of the method (may be null).
* @return A java.lang.reflect.Method.
* @throws MethodNotFoundException
* If a method cannot be found in the hierarchy.
* @throws TooManyMethodsFoundException
* If several methods were found.
*/
public static Method getMethod(Class type, Class... parameterTypes) {
return WhiteboxImpl.getMethod(type, parameterTypes);
}
/**
* Create a new instance of a class without invoking its constructor.
*
* No byte-code manipulation is needed to perform this operation and thus
* it's not necessary use the PowerMockRunner or
* PrepareForTest annotation to use this functionality.
*
* @param
* The type of the instance to create.
* @param classToInstantiate
* The type of the instance to create.
* @return A new instance of type T, created without invoking the
* constructor.
*/
public static T newInstance(Class classToInstantiate) {
return WhiteboxImpl.newInstance(classToInstantiate);
}
/**
* Convenience method to get a (declared) constructor from a class type
* without having to catch the checked exceptions otherwise required. These
* exceptions are wrapped as runtime exceptions. The constructor is also set
* to accessible.
*
* @param type
* The type of the class where the constructor is located.
* @param parameterTypes
* All parameter types of the constructor (may be
* null).
* @return A java.lang.reflect.Constructor.
* @throws ConstructorNotFoundException
* if the constructor cannot be found.
*/
public static Constructor getConstructor(Class type, Class... parameterTypes) {
return (Constructor) WhiteboxImpl.getConstructor(type, parameterTypes);
}
/**
* Set the value of a field using reflection. This method will traverse the
* super class hierarchy until a field with name fieldName is
* found.
*
* @param object
* the object whose field to modify
* @param fieldName
* the name of the field
* @param value
* the new value of the field
*/
public static void setInternalState(Object object, String fieldName, Object value) {
WhiteboxImpl.setInternalState(object, fieldName, value);
}
/**
* Set an array value of a field using reflection. This method will traverse
* the super class hierarchy until a field with name fieldName is
* found.
*
* @param object
* the object to modify
* @param fieldName
* the name of the field
* @param value
* the new value of the field
*/
public static void setInternalState(Object object, String fieldName, Object[] value) {
WhiteboxImpl.setInternalState(object, fieldName, value);
}
/**
* Set the value of a field using reflection. This method will traverse the
* super class hierarchy until the first field assignable to the
* value type is found. The value (or
* additionaValues if present) will then be assigned to this field.
*
* @param object
* the object to modify
* @param value
* the new value of the field
* @param additionalValues
* Additional values to set on the object
*/
public static void setInternalState(Object object, Object value, Object... additionalValues) {
WhiteboxImpl.setInternalState(object, value, additionalValues);
}
/**
* Set the value of a field using reflection at at specific place in the
* class hierarchy (where). This first field assignable to
* object will then be set to value.
*
* @param object
* the object to modify
* @param value
* the new value of the field
* @param where
* the class in the hierarchy where the field is defined
*/
public static void setInternalState(Object object, Object value, Class where) {
WhiteboxImpl.setInternalState(object, value, where);
}
/**
* Set the value of a field using reflection. Use this method when you need
* to specify in which class the field is declared. This might be useful
* when you have mocked the instance you are trying to modify.
*
* @param object
* the object to modify
* @param fieldName
* the name of the field
* @param value
* the new value of the field
* @param where
* the class in the hierarchy where the field is defined
*/
public static void setInternalState(Object object, String fieldName, Object value, Class where) {
WhiteboxImpl.setInternalState(object, fieldName, value, where);
}
/**
* Set the value of a field using reflection. This method will traverse the
* super class hierarchy until the first field of type fieldType is
* found. The value will then be assigned to this field.
*
* @param object
* the object to modify
* @param fieldType
* the type of the field
* @param value
* the new value of the field
*/
public static void setInternalState(Object object, Class fieldType, Object value) {
WhiteboxImpl.setInternalState(object, fieldType, value);
}
/**
* Set the value of a field using reflection at a specific location (
* where) in the class hierarchy. The value will then be
* assigned to this field. The first field matching the fieldType
* in the hierarchy will be set.
*
* @param object
* the object to modify
* @param fieldType
* the type of the field the should be set.
* @param value
* the new value of the field
* @param where
* which class in the hierarchy defining the field
*/
public static void setInternalState(Object object, Class fieldType, Object value, Class where) {
WhiteboxImpl.setInternalState(object, fieldType, value, where);
}
/**
* Get the value of a field using reflection. This method will iterate
* through the entire class hierarchy and return the value of the first
* field named fieldName. If you want to get a specific field value
* at specific place in the class hierarchy please refer to
* {@link #getInternalState(Object, String, Class)}.
*
* @param object
* the object to modify
* @param fieldName
* the name of the field
*/
public static T getInternalState(Object object, String fieldName) {
return WhiteboxImpl. getInternalState(object, fieldName);
}
/**
* Get the value of a field using reflection. Use this method when you need
* to specify in which class the field is declared. This might be useful
* when you have mocked the instance you are trying to access.
*
* @param object
* the object to modify
* @param fieldName
* the name of the field
* @param where
* which class the field is defined
*/
public static T getInternalState(Object object, String fieldName, Class where) {
return WhiteboxImpl. getInternalState(object, fieldName, where);
}
/**
* Get the value of a field using reflection. Use this method when you need
* to specify in which class the field is declared. This might be useful
* when you have mocked the instance you are trying to access. Use this
* method to avoid casting.
*
* @deprecated Use {@link #getInternalState(Object, String, Class)} instead.
*
* @param
* the expected type of the field
* @param object
* the object to modify
* @param fieldName
* the name of the field
* @param where
* which class the field is defined
* @param type
* the expected type of the field
*/
@Deprecated
public static T getInternalState(Object object, String fieldName, Class where, Class type) {
return Whitebox. getInternalState(object, fieldName, where);
}
/**
* Get the value of a field using reflection based on the fields type. This
* method will traverse the super class hierarchy until the first field of
* type fieldType is found. The value of this field will be
* returned.
*
* @param object
* the object to modify
* @param fieldType
* the type of the field
*/
public static T getInternalState(Object object, Class fieldType) {
return WhiteboxImpl. getInternalState(object, fieldType);
}
/**
* Get the value of a field using reflection based on the field type. Use
* this method when you need to specify in which class the field is
* declared. The first field matching the fieldType in
* where is the field whose value will be returned.
*
* @param
* the expected type of the field
* @param object
* the object to modify
* @param fieldType
* the type of the field
* @param where
* which class the field is defined
*/
public static T getInternalState(Object object, Class fieldType, Class where) {
return WhiteboxImpl. getInternalState(object, fieldType, where);
}
/**
* Invoke a private or inner class method without the need to specify the
* method name. This is thus a more refactor friendly version of the
* {@link #invokeMethod(Object, String, Object...)} method and is recommend
* over this method for that reason. This method might be useful to test
* private methods.
*
* @throws Throwable
*/
public static synchronized T invokeMethod(Object instance, Object... arguments) throws Exception {
return WhiteboxImpl. invokeMethod(instance, arguments);
}
/**
* Invoke a private or inner class static method without the need to specify
* the method name. This is thus a more refactor friendly version of the
* {@link #invokeMethod(Class, String, Object...)} method and is recommend
* over this method for that reason. This method might be useful to test
* private methods.
*
*/
public static synchronized T invokeMethod(Class klass, Object... arguments) throws Exception {
return WhiteboxImpl. invokeMethod(klass, arguments);
}
/**
* Invoke a private or inner class method. This might be useful to test
* private methods.
*/
public static synchronized T invokeMethod(Object instance, String methodToExecute, Object... arguments)
throws Exception {
return WhiteboxImpl. invokeMethod(instance, methodToExecute, arguments);
}
/**
* Invoke a private or inner class method in cases where PowerMock cannot
* automatically determine the type of the parameters, for example when
* mixing primitive types and wrapper types in the same method. For most
* situations use {@link #invokeMethod(Object, Object...)} instead.
*
* @throws Exception
* Exception that may occur when invoking this method.
*/
public static synchronized T invokeMethod(Object instance, String methodToExecute, Class[] argumentTypes,
Object... arguments) throws Exception {
return WhiteboxImpl. invokeMethod(instance, methodToExecute, argumentTypes, arguments);
}
/**
* Invoke a private or inner class method in a subclass (defined by
* definedIn) in cases where PowerMock cannot automatically
* determine the type of the parameters, for example when mixing primitive
* types and wrapper types in the same method. For most situations use
* {@link #invokeMethod(Object, Object...)} instead.
*
* @throws Exception
* Exception that may occur when invoking this method.
*/
public static synchronized T invokeMethod(Object instance, String methodToExecute, Class definedIn,
Class[] argumentTypes, Object... arguments) throws Exception {
return WhiteboxImpl. invokeMethod(instance, methodToExecute, definedIn, argumentTypes, arguments);
}
/**
* Invoke a private or inner class method in that is located in a subclass
* of the instance. This might be useful to test private methods.
*
* @throws Exception
* Exception that may occur when invoking this method.
*/
public static synchronized T invokeMethod(Object instance, Class declaringClass, String methodToExecute,
Object... arguments) throws Exception {
return WhiteboxImpl. invokeMethod(instance, declaringClass, methodToExecute, arguments);
}
/**
* Invoke a private or inner class method in that is located in a subclass
* of the instance. This might be useful to test private methods.
*
* Use this for overloaded methods.
*
* @throws Exception
* Exception that may occur when invoking this method.
*/
public static synchronized T invokeMethod(Object object, Class declaringClass, String methodToExecute,
Class[] parameterTypes, Object... arguments) throws Exception {
return WhiteboxImpl. invokeMethod(object, declaringClass, methodToExecute, parameterTypes, arguments);
}
/**
* Invoke a static private or inner class method. This may be useful to test
* private methods.
*
*/
public static synchronized T invokeMethod(Class clazz, String methodToExecute, Object... arguments)
throws Exception {
return WhiteboxImpl. invokeMethod(clazz, methodToExecute, arguments);
}
/**
* Invoke a constructor. Useful for testing classes with a private
* constructor when PowerMock cannot determine which constructor to invoke.
* This only happens if you have two constructors with the same number of
* arguments where one is using primitive data types and the other is using
* the wrapped counter part. For example:
*
*
* public class MyClass {
* private MyClass(Integer i) {
* ...
* }
*
* private MyClass(int i) {
* ...
* }
*
*
* This ought to be a really rare case. So for most situation, use
* {@link #invokeConstructor(Class, Object...)} instead.
*
*
* @return The object created after the constructor has been invoked.
* @throws Exception
* If an exception occur when invoking the constructor.
*/
public static T invokeConstructor(Class classThatContainsTheConstructorToTest, Class[] parameterTypes,
Object[] arguments) throws Exception {
return WhiteboxImpl.invokeConstructor(classThatContainsTheConstructorToTest, parameterTypes, arguments);
}
/**
* Invoke a constructor. Useful for testing classes with a private
* constructor.
*
*
* @return The object created after the constructor has been invoked.
* @throws Exception
* If an exception occur when invoking the constructor.
*/
public static T invokeConstructor(Class classThatContainsTheConstructorToTest, Object... arguments)
throws Exception {
return WhiteboxImpl.invokeConstructor(classThatContainsTheConstructorToTest, arguments);
}
/**
* Get the first parent constructor defined in a super class of
* klass.
*
* @param klass
* The class where the constructor is located. null
* ).
* @return A java.lang.reflect.Constructor.
*/
public static Constructor getFirstParentConstructor(Class klass) {
return WhiteboxImpl.getFirstParentConstructor(klass);
}
/**
* Get an array of {@link Method}'s that matches the supplied list of method
* names. Both instance and static methods are taken into account.
*
* @param clazz
* The class that should contain the methods.
* @param methodNames
* Names of the methods that will be returned.
* @return An array of Method's.
* @throws MethodNotFoundException
* If no method was found.
*/
public static Method[] getMethods(Class clazz, String... methodNames) {
return WhiteboxImpl.getMethods(clazz, methodNames);
}
/**
* @return The type of the of an object.
*/
public static Class getType(Object object) {
return WhiteboxImpl.getType(object);
}
/**
* Get all fields annotated with a particular annotation. This method
* traverses the class hierarchy when checking for the annotation.
*
* @param object
* The object to look for annotations. Note that if're you're
* passing an object only instance fields are checked, passing a
* class will only check static fields.
* @param annotation
* The annotation type to look for.
* @param additionalAnnotations
* Optionally more annotations to look for. If any of the
* annotations are associated with a particular field it will be
* added to the resulting Set.
* @return A set of all fields containing the particular annotation.
*/
public static Set getFieldsAnnotatedWith(Object object, Class annotation,
Class... additionalAnnotations) {
return WhiteboxImpl.getFieldsAnnotatedWith(object, annotation, additionalAnnotations);
}
/**
* Get all fields annotated with a particular annotation. This method
* traverses the class hierarchy when checking for the annotation.
*
* @param object
* The object to look for annotations. Note that if're you're
* passing an object only instance fields are checked, passing a
* class will only check static fields.
* @param annotationTypes
* The annotation types to look for
* @return A set of all fields containing the particular annotation(s).
* @since 1.3
*/
public static Set getFieldsAnnotatedWith(Object object, Class[] annotationTypes) {
return WhiteboxImpl.getFieldsAnnotatedWith(object, annotationTypes);
}
/**
* Get all instance fields for a particular object. It returns all fields
* regardless of the field modifier and regardless of where in the class
* hierarchy a field is located.
*
* @param object
* The object whose instance fields to get.
* @return All instance fields in the hierarchy. All fields are set to
* accessible
*/
public static Set getAllInstanceFields(Object object) {
return WhiteboxImpl.getAllInstanceFields(object);
}
/**
* Get all static fields for a particular type.
*
* @param type
* The class whose static fields to get.
* @return All static fields in type. All fields are set to
* accessible.
*/
public static Set getAllStaticFields(Class type) {
return WhiteboxImpl.getAllStaticFields(type);
}
/**
* Get all fields assignable from a particular type. This method traverses
* the class hierarchy when checking for the type.
*
* @param object
* The object to look for type. Note that if're you're passing an
* object only instance fields are checked, passing a class will
* only check static fields.
* @param type
* The type to look for.
* @return A set of all fields of the particular type.
*/
public static Set getFieldsOfType(Object object, Class type) {
return WhiteboxImpl.getFieldsOfType(object, type);
}
/**
* Get an inner class type
*
* @param declaringClass
* The class in which the inner class is declared.
* @param name
* The unqualified name (simple name) of the inner class.
* @return The type.
*/
public static Class