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
17package android.os;
18
19import android.annotation.NonNull;
20import android.annotation.Nullable;
21import android.annotation.SystemApi;
22import android.annotation.TestApi;
23
24/**
25 * @hide
26 */
27@SystemApi
28@TestApi
29public final class RemoteCallback implements Parcelable {
30
31    public interface OnResultListener {
32        public void onResult(Bundle result);
33    }
34
35    private final OnResultListener mListener;
36    private final Handler mHandler;
37    private final IRemoteCallback mCallback;
38
39    public RemoteCallback(OnResultListener listener) {
40        this(listener, null);
41    }
42
43    public RemoteCallback(@NonNull OnResultListener listener, @Nullable Handler handler) {
44        if (listener == null) {
45            throw new NullPointerException("listener cannot be null");
46        }
47        mListener = listener;
48        mHandler = handler;
49        mCallback = new IRemoteCallback.Stub() {
50            @Override
51            public void sendResult(Bundle data) {
52                RemoteCallback.this.sendResult(data);
53            }
54        };
55    }
56
57    RemoteCallback(Parcel parcel) {
58        mListener = null;
59        mHandler = null;
60        mCallback = IRemoteCallback.Stub.asInterface(
61                parcel.readStrongBinder());
62    }
63
64    public void sendResult(@Nullable final Bundle result) {
65        // Do local dispatch
66        if (mListener != null) {
67            if (mHandler != null) {
68                mHandler.post(new Runnable() {
69                    @Override
70                    public void run() {
71                        mListener.onResult(result);
72                    }
73                });
74            } else {
75                mListener.onResult(result);
76            }
77        // Do remote dispatch
78        } else {
79            try {
80                mCallback.sendResult(result);
81            } catch (RemoteException e) {
82                /* ignore */
83            }
84        }
85    }
86
87    @Override
88    public int describeContents() {
89        return 0;
90    }
91
92    @Override
93    public void writeToParcel(Parcel parcel, int flags) {
94        parcel.writeStrongBinder(mCallback.asBinder());
95    }
96
97    public static final Parcelable.Creator<RemoteCallback> CREATOR
98            = new Parcelable.Creator<RemoteCallback>() {
99        public RemoteCallback createFromParcel(Parcel parcel) {
100            return new RemoteCallback(parcel);
101        }
102
103        public RemoteCallback[] newArray(int size) {
104            return new RemoteCallback[size];
105        }
106    };
107}
108