com.ibm.cloud.objectstorage.smoketest

Class ReflectionUtils

java.lang.Object

com.ibm.cloud.objectstorage.smoketest.ReflectionUtils

public final class ReflectionUtils
extends Object

Utility methods for doing reflection.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ReflectionUtils.RandomSupplier<T>

Method Summary

Modifier and Type	Method and Description
static Object	createDefaultInstance(String type)
static Method	findAccessor(Object target, String propertyName) Returns the accessor method for the specified member property.
static Method	findMethod(Object target, String name, Class<?> parameterType) Finds a method of the given name that will accept a parameter of the given type.
static List<Object>	getAllByPath(Object target, List<String> path) Evaluates the given path expression and returns the list of all matching objects.
static Object	getByPath(Object target, List<String> path) Evaluates the given path expression on the given object and returns the object found.
static <T> Object	getField(T instance, Field field)
static Class<?>	getParameterTypes(Object target, List<String> path)
static <T> Class<T>	loadClass(Class<?> base, String name)
static <T> Class<T>	loadClass(ClassLoader classloader, String name)
static <T> T	newInstance(Class<T> clazz, Object... params)
static <T> T	newInstanceWithAllFieldsSet(Class<T> clz)
static <T> T	newInstanceWithAllFieldsSet(Class<T> clz, List<ReflectionUtils.RandomSupplier<?>> suppliers)
static <T> T	newInstanceWithAllFieldsSet(Class<T> clz, ReflectionUtils.RandomSupplier<?>... suppliers)
static void	setByPath(Object target, Object value, List<String> path) Sets the value of the attribute at the given path in the target object, creating any intermediate values (using the default constructor for the type) if need be.
static void	setField(Object instance, Field field, Object arg)

Methods inherited from class java.lang.Object

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

Method Detail

loadClass

public static <T> Class<T> loadClass(Class<?> base,
                                     String name)

loadClass

public static <T> Class<T> loadClass(ClassLoader classloader,
                                     String name)

newInstance

public static <T> T newInstance(Class<T> clazz,
                                Object... params)

getByPath

public static Object getByPath(Object target,
                               List<String> path)

Evaluates the given path expression on the given object and returns the object found.

Parameters:

target - the object to reflect on

path - the path to evaluate

Returns:

the result of evaluating the path against the given object

getAllByPath

public static List<Object> getAllByPath(Object target,
                                        List<String> path)

Evaluates the given path expression and returns the list of all matching objects. If the path expression does not contain any wildcards, this will return a list of at most one item. If the path contains one or more wildcards, the returned list will include the full set of values obtained by evaluating the expression with all legal value for the given wildcard.

Parameters:

target - the object to evaluate the expression against

path - the path expression to evaluate

Returns:

the list of matching values

setByPath

public static void setByPath(Object target,
                             Object value,
                             List<String> path)

Sets the value of the attribute at the given path in the target object, creating any intermediate values (using the default constructor for the type) if need be.

Parameters:

target - the object to modify

value - the value to add

path - the path into the target object at which to add the value

createDefaultInstance

public static Object createDefaultInstance(String type)

findAccessor

public static Method findAccessor(Object target,
                                  String propertyName)

Returns the accessor method for the specified member property. For example, if the member property is "Foo", this method looks for a "getFoo()" method and an "isFoo()" method. If no accessor is found, this method throws an IllegalStateException.

Parameters:

target - the object to reflect on

propertyName - the name of the property to search for

Returns:

the accessor method

Throws:

IllegalStateException - if no matching method is found

findMethod

public static Method findMethod(Object target,
                                String name,
                                Class<?> parameterType)

Finds a method of the given name that will accept a parameter of the given type. If more than one method matches, returns the first such method found.

Parameters:

target - the object to reflect on

name - the name of the method to search for

parameterType - the type of the parameter to be passed

Returns:

the matching method

Throws:

IllegalStateException - if no matching method is found

getParameterTypes

public static Class<?> getParameterTypes(Object target,
                                         List<String> path)

setField

public static void setField(Object instance,
                            Field field,
                            Object arg)

getField

public static <T> Object getField(T instance,
                                  Field field)

newInstanceWithAllFieldsSet

public static <T> T newInstanceWithAllFieldsSet(Class<T> clz)

newInstanceWithAllFieldsSet

public static <T> T newInstanceWithAllFieldsSet(Class<T> clz,
                                                ReflectionUtils.RandomSupplier<?>... suppliers)

newInstanceWithAllFieldsSet

public static <T> T newInstanceWithAllFieldsSet(Class<T> clz,
                                                List<ReflectionUtils.RandomSupplier<?>> suppliers)