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Support for testing Hibernate ORM functionality
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.testing.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.function.Supplier;
/**
* @author Vlad Mihalcea
*/
public class ReflectionUtil {
/**
* Get a field from a given class
*
* @param clazz clazz
* @param name field name
*
* @return field object
*/
public static Field getField(Class clazz, String name) {
try {
Field field = clazz.getDeclaredField( name );
field.setAccessible( true );
return field;
}
catch (NoSuchFieldException e) {
Class superClass = clazz.getSuperclass();
if ( !clazz.equals( superClass ) ) {
return getField( superClass, name );
}
throw new IllegalArgumentException( "Class " + clazz + " does not contain a " + name + " field", e );
}
}
/**
* Get a field value from a given object
*
* @param target Object whose field is being read
* @param name field name
*
* @return field object
*/
public static T getFieldValue(Object target, String name) {
try {
Field field = target.getClass().getDeclaredField( name );
field.setAccessible( true );
return (T) field.get( target );
}
catch (NoSuchFieldException e) {
throw new IllegalArgumentException(
"Class " + target.getClass() + " does not contain a " + name + " field",
e
);
}
catch (IllegalAccessException e) {
throw new IllegalArgumentException( "Cannot set field " + name, e );
}
}
/**
* Get a field value from a given class
*
* @param target Class whose field is being read
* @param name field name
*
* @return field value
*/
public static T getStaticFieldValue(Class target, String name) {
try {
Field field = getField( target, name );
return (T) field.get( null );
}
catch (IllegalAccessException e) {
throw new IllegalArgumentException( "Cannot set field " + name, e );
}
}
/**
* Set target Object field to a certain value
*
* @param target Object whose field is being set
* @param field Object field to set
* @param value the new value for the given field
*/
public static void setField(Object target, Field field, Object value) {
try {
field.set( target, value );
}
catch (IllegalAccessException e) {
throw new IllegalArgumentException( "Field " + field + " could not be set", e );
}
}
/**
* Set target Object field to a certain value
*
* @param target Object whose field is being set
* @param fieldName Object field naem to set
* @param value the new value for the given field
*/
public static void setField(Object target, String fieldName, Object value) {
try {
Field field = getField( target.getClass(), fieldName );
field.set( target, value );
}
catch (IllegalAccessException e) {
throw new IllegalArgumentException( "Field " + fieldName + " could not be set", e );
}
}
/**
* Set target Class field to a certain value
*
* @param target Class whose field is being set
* @param fieldName Class field name to set
* @param value the new value for the given field
*/
public static void setStaticField(Class target, String fieldName, Object value) {
try {
Field field = getField( target, fieldName );
field.set( null, value );
}
catch (IllegalAccessException e) {
throw new IllegalArgumentException( "Field " + fieldName + " could not be set", e );
}
}
/**
* New target Object instance using the given arguments
*
* @param constructorSupplier constructor supplier
* @param args Constructor arguments
*
* @return new Object instance
*/
public static T newInstance(Supplier> constructorSupplier, Object... args) {
try {
Constructor constructor = constructorSupplier.get();
constructor.setAccessible( true );
return (T) constructor.newInstance( args );
}
catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
throw new IllegalArgumentException( "Constructor could not be called", e );
}
}
/**
* New target Object instance using the given Class name
*
* @param className class name
*
* @return new Object instance
*/
public static T newInstance(String className) {
try {
return (T) Class.forName( className ).newInstance();
}
catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
throw new IllegalArgumentException( "Constructor could not be called", e );
}
}
/**
* Get setter method
*
* @param target target object
* @param property property
* @param parameterType setter parameter type
*
* @return setter method
*/
public static Method getSetter(Object target, String property, Class parameterType) {
String setterMethodName = "set" + property.substring( 0, 1 ).toUpperCase() + property.substring( 1 );
Method setter = getMethod( target, setterMethodName, parameterType );
setter.setAccessible( true );
return setter;
}
/**
* Get target method
*
* @param target target object
* @param methodName method name
* @param parameterTypes method parameter types
*
* @return return value
*/
public static Method getMethod(Object target, String methodName, Class... parameterTypes) {
try {
return target.getClass().getMethod( methodName, parameterTypes );
}
catch (NoSuchMethodException e) {
throw new IllegalArgumentException( e );
}
}
/**
* Invoke setter method with the given parameter
*
* @param target target object
* @param property property
* @param parameter setter parameter
*/
public static void setProperty(Object target, String property, Object parameter) {
Method setter = getSetter( target, property, parameter.getClass() );
try {
setter.invoke( target, parameter );
}
catch (IllegalAccessException | InvocationTargetException e) {
throw new IllegalArgumentException( e );
}
}
}