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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.android.inputmethod.compat;
import android.text.TextUtils;
import android.util.Log;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public final class CompatUtils {
private static final String TAG = CompatUtils.class.getSimpleName();
private CompatUtils() {
// This utility class is not publicly instantiable.
}
public static Class<?> getClass(final String className) {
try {
return Class.forName(className);
} catch (final 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 (final SecurityException | NoSuchMethodException e) {
// ignore
}
return null;
}
public static Field getField(final Class<?> targetClass, final String name) {
if (targetClass == null || TextUtils.isEmpty(name)) {
return null;
}
try {
return targetClass.getField(name);
} catch (final SecurityException | NoSuchFieldException e) {
// ignore
}
return null;
}
public static Constructor<?> getConstructor(final Class<?> targetClass,
final Class<?> ... types) {
if (targetClass == null || types == null) {
return null;
}
try {
return targetClass.getConstructor(types);
} catch (final SecurityException | NoSuchMethodException e) {
// ignore
}
return null;
}
public static Object newInstance(final Constructor<?> constructor, final Object ... args) {
if (constructor == null) {
return null;
}
try {
return constructor.newInstance(args);
} catch (final InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException e) {
Log.e(TAG, "Exception in newInstance", e);
}
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 (final IllegalAccessException | IllegalArgumentException
| InvocationTargetException e) {
Log.e(TAG, "Exception in invoke", e);
}
return defaultValue;
}
public static Object getFieldValue(final Object receiver, final Object defaultValue,
final Field field) {
if (field == null) {
return defaultValue;
}
try {
return field.get(receiver);
} catch (final IllegalAccessException | IllegalArgumentException e) {
Log.e(TAG, "Exception in getFieldValue", e);
}
return defaultValue;
}
public static void setFieldValue(final Object receiver, final Field field, final Object value) {
if (field == null) {
return;
}
try {
field.set(receiver, value);
} catch (final IllegalAccessException | IllegalArgumentException e) {
Log.e(TAG, "Exception in setFieldValue", e);
}
}
public static ClassWrapper getClassWrapper(final String className) {
return new ClassWrapper(getClass(className));
}
public static final class ClassWrapper {
private final Class<?> mClass;
public ClassWrapper(final Class<?> targetClass) {
mClass = targetClass;
}
public boolean exists() {
return mClass != null;
}
public <T> ToObjectMethodWrapper<T> getMethod(final String name,
final T defaultValue, final Class<?>... parameterTypes) {
return new ToObjectMethodWrapper<>(CompatUtils.getMethod(mClass, name, parameterTypes),
defaultValue);
}
public ToIntMethodWrapper getPrimitiveMethod(final String name, final int defaultValue,
final Class<?>... parameterTypes) {
return new ToIntMethodWrapper(CompatUtils.getMethod(mClass, name, parameterTypes),
defaultValue);
}
public ToFloatMethodWrapper getPrimitiveMethod(final String name, final float defaultValue,
final Class<?>... parameterTypes) {
return new ToFloatMethodWrapper(CompatUtils.getMethod(mClass, name, parameterTypes),
defaultValue);
}
public ToBooleanMethodWrapper getPrimitiveMethod(final String name,
final boolean defaultValue, final Class<?>... parameterTypes) {
return new ToBooleanMethodWrapper(CompatUtils.getMethod(mClass, name, parameterTypes),
defaultValue);
}
}
public static final class ToObjectMethodWrapper<T> {
private final Method mMethod;
private final T mDefaultValue;
public ToObjectMethodWrapper(final Method method, final T defaultValue) {
mMethod = method;
mDefaultValue = defaultValue;
}
@SuppressWarnings("unchecked")
public T invoke(final Object receiver, final Object... args) {
return (T) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
}
}
public static final class ToIntMethodWrapper {
private final Method mMethod;
private final int mDefaultValue;
public ToIntMethodWrapper(final Method method, final int defaultValue) {
mMethod = method;
mDefaultValue = defaultValue;
}
public int invoke(final Object receiver, final Object... args) {
return (int) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
}
}
public static final class ToFloatMethodWrapper {
private final Method mMethod;
private final float mDefaultValue;
public ToFloatMethodWrapper(final Method method, final float defaultValue) {
mMethod = method;
mDefaultValue = defaultValue;
}
public float invoke(final Object receiver, final Object... args) {
return (float) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
}
}
public static final class ToBooleanMethodWrapper {
private final Method mMethod;
private final boolean mDefaultValue;
public ToBooleanMethodWrapper(final Method method, final boolean defaultValue) {
mMethod = method;
mDefaultValue = defaultValue;
}
public boolean invoke(final Object receiver, final Object... args) {
return (boolean) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
}
}
}
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