Chiao Cheng | d80c434 | 2012-12-03 17:15:58 -0800 | [diff] [blame] | 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 | */ |
Gary Mai | 69c182a | 2016-12-05 13:07:03 -0800 | [diff] [blame] | 16 | package com.android.contacts.vcard; |
Chiao Cheng | d80c434 | 2012-12-03 17:15:58 -0800 | [diff] [blame] | 17 | |
| 18 | import java.util.concurrent.ExecutorService; |
| 19 | import java.util.concurrent.Future; |
| 20 | import java.util.concurrent.RunnableFuture; |
| 21 | import java.util.concurrent.TimeUnit; |
| 22 | |
| 23 | /** |
| 24 | * A base processor class. One instance processes vCard one import/export request (imports a given |
| 25 | * vCard or exports a vCard). Expected to be used with {@link ExecutorService}. |
| 26 | * |
| 27 | * This instance starts itself with {@link #run()} method, and can be cancelled with |
| 28 | * {@link #cancel(boolean)}. Users can check the processor's status using {@link #isCancelled()} |
| 29 | * and {@link #isDone()} asynchronously. |
| 30 | * |
| 31 | * {@link #get()} and {@link #get(long, TimeUnit)}, which are form {@link Future}, aren't |
| 32 | * supported and {@link UnsupportedOperationException} will be just thrown when they are called. |
| 33 | */ |
| 34 | public abstract class ProcessorBase implements RunnableFuture<Object> { |
| 35 | |
| 36 | /** |
| 37 | * @return the type of the processor. Must be {@link VCardService#TYPE_IMPORT} or |
| 38 | * {@link VCardService#TYPE_EXPORT}. |
| 39 | */ |
| 40 | public abstract int getType(); |
| 41 | |
| 42 | @Override |
| 43 | public abstract void run(); |
| 44 | |
| 45 | /** |
| 46 | * Cancels this operation. |
| 47 | * |
| 48 | * @param mayInterruptIfRunning ignored. When this method is called, the instance |
| 49 | * stops processing and finish itself even if the thread is running. |
| 50 | * |
| 51 | * @see Future#cancel(boolean) |
| 52 | */ |
| 53 | @Override |
| 54 | public abstract boolean cancel(boolean mayInterruptIfRunning); |
| 55 | @Override |
| 56 | public abstract boolean isCancelled(); |
| 57 | @Override |
| 58 | public abstract boolean isDone(); |
| 59 | |
| 60 | /** |
| 61 | * Just throws {@link UnsupportedOperationException}. |
| 62 | */ |
| 63 | @Override |
| 64 | public final Object get() { |
| 65 | throw new UnsupportedOperationException(); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Just throws {@link UnsupportedOperationException}. |
| 70 | */ |
| 71 | @Override |
| 72 | public final Object get(long timeout, TimeUnit unit) { |
| 73 | throw new UnsupportedOperationException(); |
| 74 | } |
| 75 | } |