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      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 
     25     public NowOrLaterWrapper(NowOrLater<A> wrapped) {
     26         mWrapped = wrapped;
     27     }
     28 
     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 
     36     public B getNow() {
     37         return get(mWrapped.getNow());
     38     }
     39 
     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      */
     49     public abstract B get(A value);
     50 
     51 }
     52