/
ReflectionUtils.java
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/
ReflectionUtils.java
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/*
* Copyright (C) 2014 Andrey Kulikov (andkulikov@gmail.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.transitionseverywhere.utils;
import android.text.TextUtils;
import android.util.Log;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class ReflectionUtils {
private static final String TAG = ReflectionUtils.class.getSimpleName();
private ReflectionUtils() {
// This utility class is not publicly instantiable.
}
public static Class<?> getClass(final String className) {
try {
return Class.forName(className);
} catch (ClassNotFoundException e) {
return null;
}
}
public static Method getMethod(final Class<?> targetClass, final String name,
final Class<?>... parameterTypes) {
if (targetClass == null || TextUtils.isEmpty(name)) return null;
try {
return targetClass.getMethod(name, parameterTypes);
} catch (SecurityException e) {
// ignore
} catch (NoSuchMethodException e) {
// ignore
}
return null;
}
public static Method getPrivateMethod(final Class<?> targetClass, final String name,
final Class<?>... parameterTypes) {
if (targetClass == null || TextUtils.isEmpty(name)) return null;
try {
Method method = targetClass.getDeclaredMethod(name, parameterTypes);
method.setAccessible(true);
return method;
} catch (SecurityException e) {
// ignore
} catch (NoSuchMethodException e) {
// ignore
}
return null;
}
public static Object invoke(final Object receiver, final Object defaultValue,
final Method method, final Object... args) {
if (method == null) return defaultValue;
try {
return method.invoke(receiver, args);
} catch (Exception e) {
Log.e(TAG, "Exception in invoke", e);
}
return defaultValue;
}
public static Field getPrivateField(final Class<?> targetClass, final String name) {
if (targetClass == null || TextUtils.isEmpty(name)) return null;
try {
Field field = targetClass.getDeclaredField(name);
field.setAccessible(true);
return field;
} catch (SecurityException e) {
e.printStackTrace();
// ignore
} catch (NoSuchFieldException e) {
e.printStackTrace();
// ignore
}
return null;
}
public static void setFieldValue(final Object receiver, final Field field, final Object value) {
if (field == null) return;
try {
field.set(receiver, value);
} catch (Exception e) {
Log.e(TAG, "Exception in setFieldValue", e);
}
}
public static Object getFieldValue(final Object receiver, final Object defaultValue,
final Field field) {
if (field == null) return defaultValue;
try {
return field.get(receiver);
} catch (Exception e) {
Log.e(TAG, "Exception in getFieldValue", e);
}
return defaultValue;
}
// Optimizations to avoid creating new objects array in every call of method.invoke(...)
// caused by "Object... args" arguments definition
private static final Object[] EMPTY_ARRAY = new Object[0];
private static final Object[] ONE_OBJECT_ARRAY = new Object[1];
private static final Object[] TWO_OBJECTS_ARRAY = new Object[2];
private static final Object[] THREE_OBJECTS_ARRAY = new Object[3];
private static final Object[] FOUR_OBJECTS_ARRAY = new Object[4];
public static Object invoke(Object receiver, Object defaultValue, Method method) {
return invoke(receiver, defaultValue, method, EMPTY_ARRAY);
}
public static Object invoke(Object receiver, Object defaultValue, Method method, Object firstArg) {
ONE_OBJECT_ARRAY[0] = firstArg;
Object result = invoke(receiver, defaultValue, method, ONE_OBJECT_ARRAY);
ONE_OBJECT_ARRAY[0] = null;
return result;
}
public static Object invoke(Object receiver, Object defaultValue, Method method,
Object firstArg, Object secondArg) {
TWO_OBJECTS_ARRAY[0] = firstArg;
TWO_OBJECTS_ARRAY[1] = secondArg;
Object result = invoke(receiver, defaultValue, method, TWO_OBJECTS_ARRAY);
TWO_OBJECTS_ARRAY[0] = null;
TWO_OBJECTS_ARRAY[1] = null;
return result;
}
public static Object invoke(Object receiver, Object defaultValue, Method method,
Object firstArg, Object secondArg, Object thirdArg) {
THREE_OBJECTS_ARRAY[0] = firstArg;
THREE_OBJECTS_ARRAY[1] = secondArg;
THREE_OBJECTS_ARRAY[2] = thirdArg;
Object result = invoke(receiver, defaultValue, method, THREE_OBJECTS_ARRAY);
THREE_OBJECTS_ARRAY[0] = null;
THREE_OBJECTS_ARRAY[1] = null;
THREE_OBJECTS_ARRAY[2] = null;
return result;
}
public static Object invoke(Object receiver, Object defaultValue, Method method,
Object firstArg, Object secondArg,
Object thirdArg, Object fourthArg) {
FOUR_OBJECTS_ARRAY[0] = firstArg;
FOUR_OBJECTS_ARRAY[1] = secondArg;
FOUR_OBJECTS_ARRAY[2] = thirdArg;
FOUR_OBJECTS_ARRAY[3] = fourthArg;
Object result = invoke(receiver, defaultValue, method, FOUR_OBJECTS_ARRAY);
FOUR_OBJECTS_ARRAY[0] = null;
FOUR_OBJECTS_ARRAY[1] = null;
FOUR_OBJECTS_ARRAY[2] = null;
FOUR_OBJECTS_ARRAY[3] = null;
return result;
}
}