1 /*
2  * Copyright (C) 2010 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 package com.android.quicksearchbox.util;
17 
18 /**
19  * {@link NowOrLater} class that converts from one type to another.
20  */
21 public abstract class NowOrLaterWrapper<A, B> implements NowOrLater<B> {
22 
23     private final NowOrLater<A> mWrapped;
24 
NowOrLaterWrapper(NowOrLater<A> wrapped)25     public NowOrLaterWrapper(NowOrLater<A> wrapped) {
26         mWrapped = wrapped;
27     }
28 
getLater(final Consumer<? super B> consumer)29     public void getLater(final Consumer<? super B> consumer) {
30         mWrapped.getLater(new Consumer<A>(){
31             public boolean consume(A value) {
32                 return consumer.consume(get(value));
33             }});
34     }
35 
getNow()36     public B getNow() {
37         return get(mWrapped.getNow());
38     }
39 
haveNow()40     public boolean haveNow() {
41         return mWrapped.haveNow();
42     }
43 
44     /**
45      * Perform the appropriate conversion. This will be called once for every call to
46      * {@link #getLater(Consumer)} or {@link #getNow()}. The thread that it's called on will depend
47      * on the behaviour of the wrapped object and the caller.
48      */
get(A value)49     public abstract B get(A value);
50 
51 }
52