EnumerateClient.java revision 8f2aca0ee4ff0eff6226df05d1531d2f2fa2f3c1 
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
17package com.android.server.fingerprint;
18
19import android.content.Context;
20import android.hardware.fingerprint.FingerprintManager;
21import android.hardware.fingerprint.IFingerprintDaemon;
22import android.hardware.fingerprint.IFingerprintServiceReceiver;
23import android.os.IBinder;
24import android.os.RemoteException;
25import android.util.Slog;
26
27/**
28 * A class to keep track of the enumeration state for a given client.
29 */
30public abstract class EnumerateClient extends ClientMonitor {
31    public EnumerateClient(Context context, long halDeviceId, IBinder token,
32            IFingerprintServiceReceiver receiver, int userId, int groupId,
33            boolean restricted, String owner) {
34        super(context, halDeviceId, token, receiver, userId, groupId, restricted, owner);
35    }
36
37    @Override
38    public int start() {
39        IFingerprintDaemon daemon = getFingerprintDaemon();
40        // The fingerprint template ids will be removed when we get confirmation from the HAL
41        try {
42            final int result = daemon.enumerate();
43            if (result != 0) {
44                Slog.w(TAG, "start enumerate for user " + getTargetUserId()
45                    + " failed, result=" + result);
46                onError(FingerprintManager.FINGERPRINT_ERROR_HW_UNAVAILABLE);
47                return result;
48            }
49        } catch (RemoteException e) {
50            Slog.e(TAG, "startRemove failed", e);
51        }
52        return 0;
53    }
54
55    @Override
56    public int stop(boolean initiatedByClient) {
57        IFingerprintDaemon daemon = getFingerprintDaemon();
58        if (daemon == null) {
59            Slog.w(TAG, "stopAuthentication: no fingeprintd!");
60            return ERROR_ESRCH;
61        }
62        try {
63            final int result = daemon.cancelEnumeration();
64            if (result != 0) {
65                Slog.w(TAG, "stop enumeration failed, result=" + result);
66                return result;
67            }
68        } catch (RemoteException e) {
69            Slog.e(TAG, "stop enumeration failed", e);
70            return ERROR_ESRCH;
71        }
72        // We don't actually stop enumerate, but inform the client that the cancel operation
73        // succeeded so we can start the next operation.
74        if (initiatedByClient) {
75            onError(FingerprintManager.FINGERPRINT_ERROR_CANCELED);
76        }
77        return 0; // success
78    }
79
80    @Override
81    public boolean onEnumerationResult(int fingerId, int groupId) {
82        IFingerprintServiceReceiver receiver = getReceiver();
83        if (receiver == null)
84            return true; // client not listening
85        try {
86            receiver.onRemoved(getHalDeviceId(), fingerId, groupId);
87        } catch (RemoteException e) {
88            Slog.w(TAG, "Failed to notify enumerated:", e);
89        }
90        return fingerId == 0; // done when id hits 0
91    }
92}
93