com.technia.tvc.core.util

Class ReflectionUtils

java.lang.Object

com.technia.tvc.core.util.ReflectionUtils

public class ReflectionUtils
extends java.lang.Object

This class contains methods that simplifies the use of reflection.

Method Summary

Modifier and Type	Method and Description
static java.lang.reflect.Constructor<?>	getConstructor(java.lang.Class<?> type, java.lang.Class<?> parameterType) Finds the constructor for the specified type and parameterType.
static java.lang.Object	getFieldValue(java.lang.Object object, java.lang.String fieldName) Gets the public specified field value from object instance
static java.lang.reflect.Method	getMethod(java.lang.Class<?> type, java.lang.String name, java.lang.Class<?> parameterType) Finds the method on the specified type, with the name name, and that takes a parameter of parameterType.
static java.lang.Object	instantiate(java.lang.String className) Instantiate an object from the specified class.
static java.lang.Object	instantiate(java.lang.String className, java.lang.Class<?> parameterType, java.lang.Object parameterValue) Instantiate an object from the specified class.
static java.lang.Object	invoke(java.lang.Object object, java.lang.String methodName) Invokes the method with the specified methodName.
static java.lang.Object	invoke(java.lang.Object object, java.lang.String methodName, java.lang.Class<?> parameterType, java.lang.Object parameterValue) Invokes the method with the specified methodName that takes a parameter of type parameterType and passes the parameterValue as an argument.
static java.lang.Object	invokeStatic(java.lang.Class<?> type, java.lang.String methodName, java.lang.Class<?>[] parameterTypes, java.lang.Object[] arguments)
static java.lang.Class<?>	loadPrimitiveClass(java.lang.String primitiveType) Loads the class for the specified primitive data type.
static java.lang.Class<?>	loadPrimitiveClassForWrapper(java.lang.Class<?> wrapperType) Loads the primitive class for the wrapper class.
static java.lang.Class<?>	loadPrimitiveOrObjectClass(java.lang.String className) Loads a primitive or object class from the specified class name.
static java.lang.Class<?>	loadWrapperClassForPrimitive(java.lang.Class<?> primitiveType) Loads the wrapper class for the primitive data type.
static java.lang.Class<?>	loadWrapperOrObjectClass(java.lang.String className) Loads the wrapper class for a primitive type or object class.

Methods inherited from class java.lang.Object

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

Method Detail

instantiate

public static java.lang.Object instantiate(java.lang.String className)
                                    throws ReflectionException

Instantiate an object from the specified class.

Parameters:

className - the name of the class on instantiate.

Returns:

the new instance.

Throws:

ReflectionException - if unable to instantiate object from specified class.

instantiate

public static java.lang.Object instantiate(java.lang.String className,
                                           java.lang.Class<?> parameterType,
                                           java.lang.Object parameterValue)
                                    throws ReflectionException

Instantiate an object from the specified class. Use a constructor that takes one parameter of the specified parameterType and pass the parameterValue as an argument.

If the className is equal to a primitive data type (e.g., int, short, boolean, double), this method will try to instantiate the corresponding wrapper class (e.g., java.lang.Integer, java.lang.Short, java.lang.Boolean, java.lang.Double).

Parameters:

className - the name of the class to instantiate.

parameterType - the parameter type.

parameterValue - the paramteter value.

Returns:

the new instance.

Throws:

ReflectionException - if unable to instantiate object from specified class.

loadPrimitiveOrObjectClass

public static java.lang.Class<?> loadPrimitiveOrObjectClass(java.lang.String className)
                                                     throws java.lang.ClassNotFoundException

Loads a primitive or object class from the specified class name.

If the className is equal to a primitive type (e.g., int, short, char, boolean) the class of that primitive type will be returned. However, if the className doesn't match the name of a primitive data type this method will try to load the class as an object (non primitive) class.

Parameters:

className - the name of the class to load.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if unable to load the class.

loadWrapperOrObjectClass

public static java.lang.Class<?> loadWrapperOrObjectClass(java.lang.String className)
                                                   throws java.lang.ClassNotFoundException

Loads the wrapper class for a primitive type or object class.

If the className is equal to a primitive data type (e.g., int, short, boolean, double), this method will try to load the corresponding wrapper class (e.g., java.lang.Integer, java.lang.Short, java.lang.Boolean, java.lang.Double).

Parameters:

className - the name of the class.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if unable to load the class.

loadPrimitiveClass

public static java.lang.Class<?> loadPrimitiveClass(java.lang.String primitiveType)
                                             throws java.lang.ClassNotFoundException

Loads the class for the specified primitive data type.

Parameters:

primitiveType - the primitive data type.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if unable to load the class.

loadWrapperClassForPrimitive

public static java.lang.Class<?> loadWrapperClassForPrimitive(java.lang.Class<?> primitiveType)
                                                       throws java.lang.ClassNotFoundException

Loads the wrapper class for the primitive data type.

If the primitiveType represents a primitive data type (e.g., int, short, boolean, double), this method will try to load the corresponding wrapper class (e.g., java.lang.Integer, java.lang.Short, java.lang.Boolean, java.lang.Double).

Parameters:

primitiveType - the primitive data type.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if unable to load the class.

loadPrimitiveClassForWrapper

public static java.lang.Class<?> loadPrimitiveClassForWrapper(java.lang.Class<?> wrapperType)
                                                       throws java.lang.ClassNotFoundException

Loads the primitive class for the wrapper class.

If the wrapperType represents a wrapper class (e.g., java.lang.Integer, java.lang.Short, java.lang.Boolean, java.lang.Double), this method will try to load the corresponding primitive data type (e.g., int, short, boolean, double)

Parameters:

wrapperType - the wrapper class.

Returns:

the loaded class.

Throws:

java.lang.ClassNotFoundException - if unable to load the class.

invoke

public static java.lang.Object invoke(java.lang.Object object,
                                      java.lang.String methodName,
                                      java.lang.Class<?> parameterType,
                                      java.lang.Object parameterValue)
                               throws ReflectionException

Invokes the method with the specified methodName that takes a parameter of type parameterType and passes the parameterValue as an argument.

Parameters:

object - the object on which to invoke the method.

methodName - the name of the method.

parameterType - the parameter type.

parameterValue - the parameter value.

Returns:

any object that is returned from the invoked method.

Throws:

ReflectionException - if unable to invoke the method.

invoke

public static java.lang.Object invoke(java.lang.Object object,
                                      java.lang.String methodName)
                               throws ReflectionException

Invokes the method with the specified methodName.

Parameters:

object - the object on which to invoke the method.

methodName - the name of the method.

Returns:

any object that is returned from the invoked method.

Throws:

ReflectionException - if unable to invoke the method.

getConstructor

public static java.lang.reflect.Constructor<?> getConstructor(java.lang.Class<?> type,
                                                              java.lang.Class<?> parameterType)
                                                       throws ReflectionException

Finds the constructor for the specified type and parameterType.

Parameters:

type - the type for which to get the constructor.

parameterType - the parameter type.

Returns:

the contructor.

Throws:

ReflectionException - if unable to find the constructor.

getMethod

public static java.lang.reflect.Method getMethod(java.lang.Class<?> type,
                                                 java.lang.String name,
                                                 java.lang.Class<?> parameterType)
                                          throws ReflectionException

Finds the method on the specified type, with the name name, and that takes a parameter of parameterType.

Parameters:

type - the class on which to find the method.

name - the name of the method.

parameterType - the parameter type.

Returns:

the method.

Throws:

ReflectionException - if unable to find the method.

invokeStatic

public static java.lang.Object invokeStatic(java.lang.Class<?> type,
                                            java.lang.String methodName,
                                            java.lang.Class<?>[] parameterTypes,
                                            java.lang.Object[] arguments)
                                     throws ReflectionException

Throws:

ReflectionException

getFieldValue

public static java.lang.Object getFieldValue(java.lang.Object object,
                                             java.lang.String fieldName)
                                      throws ReflectionException

Gets the public specified field value from object instance

Parameters:

object -

field -

Returns:

The value

Throws:

ReflectionException

Since:

2018-09-04