| /* |
| * Copyright (C) 2014 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 android.hardware.camera2.dispatch; |
| |
| |
| import java.lang.reflect.Method; |
| |
| import static com.android.internal.util.Preconditions.*; |
| |
| /** |
| * Duck typing dispatcher; converts dispatch methods calls from one class to another by |
| * looking up equivalently methods at runtime by name. |
| * |
| * <p>For example, if two types have identical method names and arguments, but |
| * are not subclasses/subinterfaces of each other, this dispatcher will allow calls to be |
| * made from one type to the other.</p> |
| * |
| * @param <TFrom> source dispatch type, whose methods with {@link #dispatch} will be called |
| * @param <T> destination dispatch type, methods will be converted to the class of {@code T} |
| */ |
| public class DuckTypingDispatcher<TFrom, T> implements Dispatchable<TFrom> { |
| |
| private final MethodNameInvoker<T> mDuck; |
| |
| /** |
| * Create a new duck typing dispatcher. |
| * |
| * @param target destination dispatch type, methods will be redirected to this dispatcher |
| * @param targetClass destination dispatch class, methods will be converted to this class's |
| */ |
| public DuckTypingDispatcher(Dispatchable<T> target, Class<T> targetClass) { |
| checkNotNull(targetClass, "targetClass must not be null"); |
| checkNotNull(target, "target must not be null"); |
| |
| mDuck = new MethodNameInvoker<T>(target, targetClass); |
| } |
| |
| @Override |
| public Object dispatch(Method method, Object[] args) { |
| return mDuck.invoke(method.getName(), args); |
| } |
| } |