Yohei Yukawa | 19a80a1 | 2016-03-14 22:57:37 -0700 | [diff] [blame] | 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 | |
| 17 | package android.view.inputmethod; |
| 18 | |
| 19 | import android.annotation.IntDef; |
| 20 | import android.annotation.NonNull; |
| 21 | import android.annotation.Nullable; |
| 22 | |
| 23 | import java.lang.annotation.Retention; |
| 24 | import java.lang.reflect.Method; |
| 25 | import java.lang.reflect.Modifier; |
| 26 | import java.util.Collections; |
| 27 | import java.util.Map; |
| 28 | import java.util.WeakHashMap; |
| 29 | |
| 30 | import static java.lang.annotation.RetentionPolicy.SOURCE; |
| 31 | |
| 32 | /** |
| 33 | * @hide |
| 34 | */ |
| 35 | public final class InputConnectionInspector { |
| 36 | |
| 37 | @Retention(SOURCE) |
| 38 | @IntDef({MissingMethodFlags.GET_SELECTED_TEXT, |
| 39 | MissingMethodFlags.SET_COMPOSING_REGION, |
| 40 | MissingMethodFlags.COMMIT_CORRECTION, |
| 41 | MissingMethodFlags.REQUEST_CURSOR_UPDATES, |
| 42 | MissingMethodFlags.DELETE_SURROUNDING_TEXT_IN_CODE_POINTS, |
| 43 | MissingMethodFlags.GET_HANDLER, |
| 44 | }) |
| 45 | public @interface MissingMethodFlags { |
| 46 | /** |
| 47 | * {@link InputConnection#getSelectedText(int)} is available in |
| 48 | * {@link android.os.Build.VERSION_CODES#GINGERBREAD} and later. |
| 49 | */ |
| 50 | int GET_SELECTED_TEXT = 1 << 0; |
| 51 | /** |
| 52 | * {@link InputConnection#setComposingRegion(int, int)} is available in |
| 53 | * {@link android.os.Build.VERSION_CODES#GINGERBREAD} and later. |
| 54 | */ |
| 55 | int SET_COMPOSING_REGION = 1 << 1; |
| 56 | /** |
| 57 | * {@link InputConnection#commitCorrection(CorrectionInfo)} is available in |
| 58 | * {@link android.os.Build.VERSION_CODES#HONEYCOMB} and later. |
| 59 | */ |
| 60 | int COMMIT_CORRECTION = 1 << 2; |
| 61 | /** |
| 62 | * {@link InputConnection#requestCursorUpdates(int)} is available in |
| 63 | * {@link android.os.Build.VERSION_CODES#LOLLIPOP} and later. |
| 64 | */ |
| 65 | int REQUEST_CURSOR_UPDATES = 1 << 3; |
| 66 | /** |
| 67 | * {@link InputConnection#deleteSurroundingTextInCodePoints(int, int)}} is available in |
| 68 | * {@link android.os.Build.VERSION_CODES#N} and later. |
| 69 | */ |
| 70 | int DELETE_SURROUNDING_TEXT_IN_CODE_POINTS = 1 << 4; |
| 71 | /** |
| 72 | * {@link InputConnection#deleteSurroundingTextInCodePoints(int, int)}} is available in |
| 73 | * {@link android.os.Build.VERSION_CODES#N} and later. |
| 74 | */ |
| 75 | int GET_HANDLER = 1 << 5; |
| 76 | } |
| 77 | |
| 78 | private static final Map<Class, Integer> sMissingMethodsMap = Collections.synchronizedMap( |
| 79 | new WeakHashMap<>()); |
| 80 | |
| 81 | @MissingMethodFlags |
| 82 | public static int getMissingMethodFlags(@Nullable final InputConnection ic) { |
| 83 | if (ic == null) { |
| 84 | return 0; |
| 85 | } |
| 86 | // Optimization for a known class. |
| 87 | if (ic instanceof BaseInputConnection) { |
| 88 | return 0; |
| 89 | } |
| 90 | // Optimization for a known class. |
| 91 | if (ic instanceof InputConnectionWrapper) { |
| 92 | return ((InputConnectionWrapper) ic).getMissingMethodFlags(); |
| 93 | } |
| 94 | return getMissingMethodFlagsInternal(ic.getClass()); |
| 95 | } |
| 96 | |
| 97 | @MissingMethodFlags |
| 98 | public static int getMissingMethodFlagsInternal(@NonNull final Class clazz) { |
| 99 | final Integer cachedFlags = sMissingMethodsMap.get(clazz); |
| 100 | if (cachedFlags != null) { |
| 101 | return cachedFlags; |
| 102 | } |
| 103 | int flags = 0; |
| 104 | if (!hasGetSelectedText(clazz)) { |
| 105 | flags |= MissingMethodFlags.GET_SELECTED_TEXT; |
| 106 | } |
| 107 | if (!hasSetComposingRegion(clazz)) { |
| 108 | flags |= MissingMethodFlags.SET_COMPOSING_REGION; |
| 109 | } |
| 110 | if (!hasCommitCorrection(clazz)) { |
| 111 | flags |= MissingMethodFlags.COMMIT_CORRECTION; |
| 112 | } |
| 113 | if (!hasRequestCursorUpdate(clazz)) { |
| 114 | flags |= MissingMethodFlags.REQUEST_CURSOR_UPDATES; |
| 115 | } |
| 116 | if (!hasDeleteSurroundingTextInCodePoints(clazz)) { |
| 117 | flags |= MissingMethodFlags.DELETE_SURROUNDING_TEXT_IN_CODE_POINTS; |
| 118 | } |
| 119 | if (!hasGetHandler(clazz)) { |
| 120 | flags |= MissingMethodFlags.GET_HANDLER; |
| 121 | } |
| 122 | sMissingMethodsMap.put(clazz, flags); |
| 123 | return flags; |
| 124 | } |
| 125 | |
| 126 | private static boolean hasGetSelectedText(@NonNull final Class clazz) { |
| 127 | try { |
| 128 | final Method method = clazz.getMethod("getSelectedText", int.class); |
| 129 | return !Modifier.isAbstract(method.getModifiers()); |
| 130 | } catch (NoSuchMethodException e) { |
| 131 | return false; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | private static boolean hasSetComposingRegion(@NonNull final Class clazz) { |
| 136 | try { |
| 137 | final Method method = clazz.getMethod("setComposingRegion", int.class, int.class); |
| 138 | return !Modifier.isAbstract(method.getModifiers()); |
| 139 | } catch (NoSuchMethodException e) { |
| 140 | return false; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | private static boolean hasCommitCorrection(@NonNull final Class clazz) { |
| 145 | try { |
| 146 | final Method method = clazz.getMethod("commitCorrection", CorrectionInfo.class); |
| 147 | return !Modifier.isAbstract(method.getModifiers()); |
| 148 | } catch (NoSuchMethodException e) { |
| 149 | return false; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | private static boolean hasRequestCursorUpdate(@NonNull final Class clazz) { |
| 154 | try { |
| 155 | final Method method = clazz.getMethod("requestCursorUpdates", int.class); |
| 156 | return !Modifier.isAbstract(method.getModifiers()); |
| 157 | } catch (NoSuchMethodException e) { |
| 158 | return false; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | private static boolean hasDeleteSurroundingTextInCodePoints(@NonNull final Class clazz) { |
| 163 | try { |
| 164 | final Method method = clazz.getMethod("deleteSurroundingTextInCodePoints", int.class, |
| 165 | int.class); |
| 166 | return !Modifier.isAbstract(method.getModifiers()); |
| 167 | } catch (NoSuchMethodException e) { |
| 168 | return false; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | private static boolean hasGetHandler(@NonNull final Class clazz) { |
| 173 | try { |
| 174 | final Method method = clazz.getMethod("getHandler"); |
| 175 | return !Modifier.isAbstract(method.getModifiers()); |
| 176 | } catch (NoSuchMethodException e) { |
| 177 | return false; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | public static String getMissingMethodFlagsAsString(@MissingMethodFlags final int flags) { |
| 182 | final StringBuilder sb = new StringBuilder(); |
| 183 | boolean isEmpty = true; |
| 184 | if ((flags & MissingMethodFlags.GET_SELECTED_TEXT) != 0) { |
| 185 | sb.append("getSelectedText(int)"); |
| 186 | isEmpty = false; |
| 187 | } |
| 188 | if ((flags & MissingMethodFlags.SET_COMPOSING_REGION) != 0) { |
| 189 | if (!isEmpty) { |
| 190 | sb.append(","); |
| 191 | } |
| 192 | sb.append("setComposingRegion(int, int)"); |
| 193 | isEmpty = false; |
| 194 | } |
| 195 | if ((flags & MissingMethodFlags.COMMIT_CORRECTION) != 0) { |
| 196 | if (!isEmpty) { |
| 197 | sb.append(","); |
| 198 | } |
| 199 | sb.append("commitCorrection(CorrectionInfo)"); |
| 200 | isEmpty = false; |
| 201 | } |
| 202 | if ((flags & MissingMethodFlags.REQUEST_CURSOR_UPDATES) != 0) { |
| 203 | if (!isEmpty) { |
| 204 | sb.append(","); |
| 205 | } |
| 206 | sb.append("requestCursorUpdate(int)"); |
| 207 | isEmpty = false; |
| 208 | } |
| 209 | if ((flags & MissingMethodFlags.DELETE_SURROUNDING_TEXT_IN_CODE_POINTS) != 0) { |
| 210 | if (!isEmpty) { |
| 211 | sb.append(","); |
| 212 | } |
| 213 | sb.append("deleteSurroundingTextInCodePoints(int, int)"); |
| 214 | isEmpty = false; |
| 215 | } |
| 216 | if ((flags & MissingMethodFlags.GET_HANDLER) != 0) { |
| 217 | if (!isEmpty) { |
| 218 | sb.append(","); |
| 219 | } |
| 220 | sb.append("getHandler()"); |
| 221 | } |
| 222 | return sb.toString(); |
| 223 | } |
| 224 | } |