Felipe Leme | 63c601a | 2017-09-27 17:40:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 | |
| 17 | package android.service.autofill; |
| 18 | |
| 19 | import static android.view.autofill.Helper.sDebug; |
| 20 | |
| 21 | import android.annotation.NonNull; |
| 22 | import android.annotation.Nullable; |
| 23 | import android.os.Parcel; |
| 24 | import android.os.Parcelable; |
| 25 | import android.util.Pair; |
| 26 | import android.widget.RemoteViews; |
| 27 | |
| 28 | import com.android.internal.util.Preconditions; |
| 29 | |
| 30 | import java.util.ArrayList; |
| 31 | |
| 32 | /** |
| 33 | * Defines actions to be applied to a {@link RemoteViews template presentation}. |
| 34 | * |
| 35 | * |
| 36 | * <p>It supports 2 types of actions: |
| 37 | * |
| 38 | * <ol> |
| 39 | * <li>{@link RemoteViews Actions} to be applied to the template. |
| 40 | * <li>{@link Transformation Transformations} to be applied on child views. |
| 41 | * </ol> |
| 42 | * |
| 43 | * <p>Typically used on {@link CustomDescription custom descriptions} to conditionally display |
| 44 | * differents views based on user input - see |
| 45 | * {@link CustomDescription.Builder#batchUpdate(Validator, BatchUpdates)} for more information. |
| 46 | */ |
| 47 | public final class BatchUpdates implements Parcelable { |
| 48 | |
| 49 | private final ArrayList<Pair<Integer, InternalTransformation>> mTransformations; |
| 50 | private final RemoteViews mUpdates; |
| 51 | |
| 52 | private BatchUpdates(Builder builder) { |
| 53 | mTransformations = builder.mTransformations; |
| 54 | mUpdates = builder.mUpdates; |
| 55 | } |
| 56 | |
| 57 | /** @hide */ |
| 58 | @Nullable |
| 59 | public ArrayList<Pair<Integer, InternalTransformation>> getTransformations() { |
| 60 | return mTransformations; |
| 61 | } |
| 62 | |
| 63 | /** @hide */ |
| 64 | @Nullable |
| 65 | public RemoteViews getUpdates() { |
| 66 | return mUpdates; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Builder for {@link BatchUpdates} objects. |
| 71 | */ |
| 72 | public static class Builder { |
| 73 | private RemoteViews mUpdates; |
| 74 | |
| 75 | private boolean mDestroyed; |
| 76 | private ArrayList<Pair<Integer, InternalTransformation>> mTransformations; |
| 77 | |
| 78 | /** |
| 79 | * Applies the {@code updates} in the underlying presentation template. |
| 80 | * |
| 81 | * <p><b>Note:</b> The updates are applied before the |
| 82 | * {@link #transformChild(int, Transformation) transformations} are applied to the children |
| 83 | * views. |
| 84 | * |
Dake Gu | 36b86c2 | 2018-04-16 12:49:30 -0700 | [diff] [blame] | 85 | * <p>Theme does not work with RemoteViews layout. Avoid hardcoded text color |
| 86 | * or background color: Autofill on different platforms may have different themes. |
| 87 | * |
Felipe Leme | 63c601a | 2017-09-27 17:40:30 -0700 | [diff] [blame] | 88 | * @param updates a {@link RemoteViews} with the updated actions to be applied in the |
| 89 | * underlying presentation template. |
| 90 | * |
| 91 | * @return this builder |
| 92 | * @throws IllegalArgumentException if {@code condition} is not a class provided |
| 93 | * by the Android System. |
| 94 | */ |
| 95 | public Builder updateTemplate(@NonNull RemoteViews updates) { |
| 96 | throwIfDestroyed(); |
| 97 | mUpdates = Preconditions.checkNotNull(updates); |
| 98 | return this; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Adds a transformation to replace the value of a child view with the fields in the |
| 103 | * screen. |
| 104 | * |
| 105 | * <p>When multiple transformations are added for the same child view, they are applied |
| 106 | * in the same order as added. |
| 107 | * |
| 108 | * <p><b>Note:</b> The transformations are applied after the |
| 109 | * {@link #updateTemplate(RemoteViews) updates} are applied to the presentation template. |
| 110 | * |
| 111 | * @param id view id of the children view. |
| 112 | * @param transformation an implementation provided by the Android System. |
| 113 | * @return this builder. |
| 114 | * @throws IllegalArgumentException if {@code transformation} is not a class provided |
| 115 | * by the Android System. |
| 116 | */ |
| 117 | public Builder transformChild(int id, @NonNull Transformation transformation) { |
| 118 | throwIfDestroyed(); |
| 119 | Preconditions.checkArgument((transformation instanceof InternalTransformation), |
| 120 | "not provided by Android System: " + transformation); |
| 121 | if (mTransformations == null) { |
| 122 | mTransformations = new ArrayList<>(); |
| 123 | } |
| 124 | mTransformations.add(new Pair<>(id, (InternalTransformation) transformation)); |
| 125 | return this; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Creates a new {@link BatchUpdates} instance. |
| 130 | * |
| 131 | * @throws IllegalStateException if {@link #build()} was already called before or no call |
| 132 | * to {@link #updateTemplate(RemoteViews)} or {@link #transformChild(int, Transformation)} |
| 133 | * has been made. |
| 134 | */ |
| 135 | public BatchUpdates build() { |
| 136 | throwIfDestroyed(); |
| 137 | Preconditions.checkState(mUpdates != null || mTransformations != null, |
| 138 | "must call either updateTemplate() or transformChild() at least once"); |
| 139 | mDestroyed = true; |
| 140 | return new BatchUpdates(this); |
| 141 | } |
| 142 | |
| 143 | private void throwIfDestroyed() { |
| 144 | if (mDestroyed) { |
| 145 | throw new IllegalStateException("Already called #build()"); |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | ///////////////////////////////////// |
| 151 | // Object "contract" methods. // |
| 152 | ///////////////////////////////////// |
| 153 | @Override |
| 154 | public String toString() { |
| 155 | if (!sDebug) return super.toString(); |
| 156 | |
| 157 | return new StringBuilder("BatchUpdates: [") |
| 158 | .append(", transformations=") |
| 159 | .append(mTransformations == null ? "N/A" : mTransformations.size()) |
| 160 | .append(", updates=").append(mUpdates) |
| 161 | .append("]").toString(); |
| 162 | } |
| 163 | |
| 164 | ///////////////////////////////////// |
| 165 | // Parcelable "contract" methods. // |
| 166 | ///////////////////////////////////// |
| 167 | @Override |
| 168 | public int describeContents() { |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | public void writeToParcel(Parcel dest, int flags) { |
| 174 | if (mTransformations == null) { |
| 175 | dest.writeIntArray(null); |
| 176 | } else { |
| 177 | final int size = mTransformations.size(); |
| 178 | final int[] ids = new int[size]; |
| 179 | final InternalTransformation[] values = new InternalTransformation[size]; |
| 180 | for (int i = 0; i < size; i++) { |
| 181 | final Pair<Integer, InternalTransformation> pair = mTransformations.get(i); |
| 182 | ids[i] = pair.first; |
| 183 | values[i] = pair.second; |
| 184 | } |
| 185 | dest.writeIntArray(ids); |
| 186 | dest.writeParcelableArray(values, flags); |
| 187 | } |
| 188 | dest.writeParcelable(mUpdates, flags); |
| 189 | } |
Jeff Sharkey | 9e8f83d | 2019-02-28 12:06:45 -0700 | [diff] [blame] | 190 | public static final @android.annotation.NonNull Parcelable.Creator<BatchUpdates> CREATOR = |
Felipe Leme | 63c601a | 2017-09-27 17:40:30 -0700 | [diff] [blame] | 191 | new Parcelable.Creator<BatchUpdates>() { |
| 192 | @Override |
| 193 | public BatchUpdates createFromParcel(Parcel parcel) { |
| 194 | // Always go through the builder to ensure the data ingested by |
| 195 | // the system obeys the contract of the builder to avoid attacks |
| 196 | // using specially crafted parcels. |
| 197 | final Builder builder = new Builder(); |
| 198 | final int[] ids = parcel.createIntArray(); |
| 199 | if (ids != null) { |
| 200 | final InternalTransformation[] values = |
| 201 | parcel.readParcelableArray(null, InternalTransformation.class); |
| 202 | final int size = ids.length; |
| 203 | for (int i = 0; i < size; i++) { |
| 204 | builder.transformChild(ids[i], values[i]); |
| 205 | } |
| 206 | } |
| 207 | final RemoteViews updates = parcel.readParcelable(null); |
| 208 | if (updates != null) { |
| 209 | builder.updateTemplate(updates); |
| 210 | } |
| 211 | return builder.build(); |
| 212 | } |
| 213 | |
| 214 | @Override |
| 215 | public BatchUpdates[] newArray(int size) { |
| 216 | return new BatchUpdates[size]; |
| 217 | } |
| 218 | }; |
| 219 | } |