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| import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import java.lang.reflect.*;
public class ReflectionUtils {
private static final Log logger = LogFactory.getLog(ReflectionUtils.class);
public static void setFieldValue(final Object object, final String fieldName, final Object value) {
Field field = getDeclaredField(object, fieldName);
if (field == null)
throw new IllegalArgumentException(
"Could not find field [" + fieldName + "] on target [" + object + "]");
makeAccessible(field);
try {
field.set(object, value);
} catch (IllegalAccessException e) {
}
}
public static Object getFieldValue(final Object object, final String fieldName) {
Field field = getDeclaredField(object, fieldName);
if (field == null)
throw new IllegalArgumentException(
"Could not find field [" + fieldName + "] on target [" + object + "]");
makeAccessible(field);
Object result = null;
try {
result = field.get(object);
} catch (IllegalAccessException e) {
}
return result;
}
public static Object invokeMethod(final Object object, final String methodName,
final Class<?>[] parameterTypes, final Object[] parameters) throws InvocationTargetException {
Method method = getDeclaredMethod(object, methodName, parameterTypes);
if (method == null)
throw new IllegalArgumentException(
"Could not find method [" + methodName + "] on target [" + object + "]");
method.setAccessible(true);
try {
return method.invoke(object, parameters);
} catch (IllegalAccessException e) {
}
return null;
}
protected static Field getDeclaredField(final Object object, final String fieldName) {
for (Class<?> superClass = object.getClass();
superClass != Object.class; superClass = superClass.getSuperclass()) {
try {
return superClass.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
}
}
return null;
}
protected static void makeAccessible(final Field field) {
if (!Modifier.isPublic(field.getModifiers()) || !Modifier
.isPublic(field.getDeclaringClass().getModifiers())) {
field.setAccessible(true);
}
}
protected static Method getDeclaredMethod(Object object, String methodName, Class<?>[] parameterTypes) {
for (Class<?> superClass = object.getClass();
superClass != Object.class; superClass = superClass.getSuperclass()) {
try {
return superClass.getDeclaredMethod(methodName, parameterTypes);
} catch (NoSuchMethodException e) {
}
}
return null;
}
@SuppressWarnings("unchecked") public static <T> Class<T> getSuperClassGenricType(final Class clazz) {
return getSuperClassGenricType(clazz, 0);
}
@SuppressWarnings("unchecked") public static Class getSuperClassGenricType(final Class clazz,
final int index) {
Type genType = clazz.getGenericSuperclass();
if (!(genType instanceof ParameterizedType)) {
logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
return Object.class;
}
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
if (index >= params.length || index < 0) {
logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
+ params.length);
return Object.class;
}
if (!(params[index] instanceof Class)) {
logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
return Object.class;
}
return (Class) params[index];
}
public static IllegalArgumentException convertToUncheckedException(Exception e) {
if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
|| e instanceof NoSuchMethodException)
return new IllegalArgumentException("Refelction Exception.", e);
else
return new IllegalArgumentException(e);
}
}
|