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 android.service.autofill;
18
19import android.annotation.Nullable;
20import android.app.Activity;
21import android.os.RemoteException;
22
23/**
24 * Handles autofill requests from the {@link AutofillService} into the {@link Activity} being
25 * autofilled.
26 */
27public final class FillCallback {
28    private final IFillCallback mCallback;
29    private final int mRequestId;
30    private boolean mCalled;
31
32    /** @hide */
33    public FillCallback(IFillCallback callback, int requestId) {
34        mCallback = callback;
35        mRequestId = requestId;
36    }
37
38    /**
39     * Notifies the Android System that an
40     * {@link AutofillService#onFillRequest(FillRequest, android.os.CancellationSignal,
41     * FillCallback)} was successfully fulfilled by the service.
42     *
43     * @param response autofill information for that activity, or {@code null} when the activity
44     * cannot be autofilled (for example, if it only contains read-only fields). See
45     * {@link FillResponse} for examples.
46     */
47    public void onSuccess(@Nullable FillResponse response) {
48        assertNotCalled();
49        mCalled = true;
50
51        if (response != null) {
52            response.setRequestId(mRequestId);
53        }
54
55        try {
56            mCallback.onSuccess(response);
57        } catch (RemoteException e) {
58            e.rethrowAsRuntimeException();
59        }
60    }
61
62    /**
63     * Notifies the Android System that an
64     * {@link AutofillService#onFillRequest(FillRequest, android.os.CancellationSignal,
65     * FillCallback)} could not be fulfilled by the service.
66     *
67     * @param message error message to be displayed to the user.
68     */
69    public void onFailure(@Nullable CharSequence message) {
70        assertNotCalled();
71        mCalled = true;
72        try {
73            mCallback.onFailure(message);
74        } catch (RemoteException e) {
75            e.rethrowAsRuntimeException();
76        }
77    }
78
79    private void assertNotCalled() {
80        if (mCalled) {
81            throw new IllegalStateException("Already called");
82        }
83    }
84}
85