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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.documentsui.base;
     18 
     19 /**
     20  * A functional interface that handles an event and returns a boolean to indicate if the event
     21  * is consumed.
     22  */
     23 @FunctionalInterface
     24 public interface EventHandler<T> {
     25     boolean accept(T event);
     26 
     27     public static <T> EventHandler<T> createStub(boolean reply) {
     28         return new Stub<T>(reply);
     29     }
     30 
     31     public static final class Stub<T> implements EventHandler<T> {
     32 
     33         private boolean mReply;
     34 
     35         private Stub(boolean reply) {
     36             mReply = reply;}
     37 
     38         @Override
     39         public boolean accept(T event) {
     40             return mReply;
     41         }
     42 
     43     }
     44 }