org.parceler

Class InjectionUtil

java.lang.Object

org.parceler.InjectionUtil

public final class InjectionUtil
extends Object

Utility class for performing a variety of operations through reflection. This functionality should be used sparingly as frequent calls can cause performance issues.

Author:

John Ericksen

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	InjectionUtil.GenericType<T>

Field Summary

Fields

Modifier and Type	Field and Description
static String	CALL_CONSTRUCTOR_METHOD
static String	CALL_METHOD_METHOD
static String	GET_FIELD_METHOD
static String	SET_FIELD_METHOD

Method Summary

Modifier and Type	Method and Description
static <T> T	callConstructor(Class<T> targetClass, Class[] argClasses, Object[] args) Instantiates a class by calling the constructor.
static <T> T	callConstructor(InjectionUtil.GenericType<T> targetClass, Class[] argClasses, Object[] args)
static <T> T	callMethod(Class<T> retClass, Class<?> targetClass, Object target, String method, Class[] argClasses, Object[] args) Calls a method with the provided arguments as parameters.
static <T> T	callMethod(InjectionUtil.GenericType<T> retClass, Class<?> targetClass, Object target, String method, Class[] argClasses, Object[] args)
static <T> T	getField(Class<T> returnType, Class<?> targetClass, Object target, String field) Returns the value of a field.
static <T> T	getField(InjectionUtil.GenericType<T> returnType, Class<?> targetClass, Object target, String field)
static void	setField(Class<?> targetClass, Object target, String field, Object value) Updates field with the given value.

Methods inherited from class java.lang.Object

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

Field Detail

GET_FIELD_METHOD

public static final String GET_FIELD_METHOD

See Also:

Constant Field Values

SET_FIELD_METHOD

public static final String SET_FIELD_METHOD

See Also:

Constant Field Values

CALL_METHOD_METHOD

public static final String CALL_METHOD_METHOD

See Also:

Constant Field Values

CALL_CONSTRUCTOR_METHOD

public static final String CALL_CONSTRUCTOR_METHOD

See Also:

Constant Field Values

Method Detail

getField

public static <T> T getField(Class<T> returnType,
                             Class<?> targetClass,
                             Object target,
                             String field)

Returns the value of a field.

Type Parameters:

T - type parameter

Parameters:

returnType - type of the field

targetClass - class represented by the target parameter

target - object containing the field

field - name of the field

Returns:

field value

getField

public static <T> T getField(InjectionUtil.GenericType<T> returnType,
                             Class<?> targetClass,
                             Object target,
                             String field)

setField

public static void setField(Class<?> targetClass,
                            Object target,
                            String field,
                            Object value)

Updates field with the given value.

Parameters:

targetClass - class representing the object containing the field.

target - object containing the field to update

field - name of the field

value - object to update the field to

callMethod

public static <T> T callMethod(Class<T> retClass,
                               Class<?> targetClass,
                               Object target,
                               String method,
                               Class[] argClasses,
                               Object[] args)

Calls a method with the provided arguments as parameters.

Type Parameters:

T - relating type parameter

Parameters:

retClass - the method return value

targetClass - the instance class

target - the instance containing the method

method - the method name

argClasses - types of the method arguments

args - method arguments used during invocation

Returns:

method return value

callMethod

public static <T> T callMethod(InjectionUtil.GenericType<T> retClass,
                               Class<?> targetClass,
                               Object target,
                               String method,
                               Class[] argClasses,
                               Object[] args)

callConstructor

public static <T> T callConstructor(Class<T> targetClass,
                                    Class[] argClasses,
                                    Object[] args)

Instantiates a class by calling the constructor.

Type Parameters:

T - relating type parameter

Parameters:

targetClass - instance type to construct

argClasses - argument types accepted by the constructor

args - constructor argument values

Returns:

instance created by constructor

callConstructor

public static <T> T callConstructor(InjectionUtil.GenericType<T> targetClass,
                                    Class[] argClasses,
                                    Object[] args)