| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.util; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.annotation.Size; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.util.HashSet; |
| import java.util.Locale; |
| |
| // TODO: We don't except too many LocaleLists to exist at the same time, and |
| // we need access to the data at native level, so we should pass the data |
| // down to the native level, create a map of every list seen there, take a |
| // pointer back, and just keep that pointer in the Java-level object, so |
| // things could be copied very quickly. |
| |
| /** |
| * LocaleList is an immutable list of Locales, typically used to keep an |
| * ordered user preferences for locales. |
| */ |
| public final class LocaleList { |
| private final Locale[] mList; |
| // This is a comma-separated list of the locales in the LocaleList created at construction time, |
| // basically the result of running each locale's toLanguageTag() method and concatenating them |
| // with commas in between. |
| private final String mStringRepresentation; |
| |
| private static final Locale[] sEmptyList = new Locale[0]; |
| private static final LocaleList sEmptyLocaleList = new LocaleList(); |
| |
| public Locale get(int location) { |
| return location < mList.length ? mList[location] : null; |
| } |
| |
| @Nullable |
| public Locale getPrimary() { |
| return mList.length == 0 ? null : get(0); |
| } |
| |
| public boolean isEmpty() { |
| return mList.length == 0; |
| } |
| |
| public int size() { |
| return mList.length; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (other == this) |
| return true; |
| if (!(other instanceof LocaleList)) |
| return false; |
| final Locale[] otherList = ((LocaleList) other).mList; |
| if (mList.length != otherList.length) |
| return false; |
| for (int i = 0; i < mList.length; ++i) { |
| if (!mList[i].equals(otherList[i])) |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = 1; |
| for (int i = 0; i < mList.length; ++i) { |
| result = 31 * result + mList[i].hashCode(); |
| } |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("["); |
| for (int i = 0; i < mList.length; ++i) { |
| sb.append(mList[i]); |
| if (i < mList.length - 1) { |
| sb.append(','); |
| } |
| } |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| @NonNull |
| public String toLanguageTags() { |
| return mStringRepresentation; |
| } |
| |
| /** |
| * It is almost always better to call {@link #getEmptyLocaleList()} instead which returns |
| * a pre-constructed empty locale list. |
| */ |
| public LocaleList() { |
| mList = sEmptyList; |
| mStringRepresentation = ""; |
| } |
| |
| /** |
| * @throws NullPointerException if any of the input locales is <code>null</code>. |
| * @throws IllegalArgumentException if any of the input locales repeat. |
| */ |
| public LocaleList(@Nullable Locale locale) { |
| if (locale == null) { |
| mList = sEmptyList; |
| mStringRepresentation = ""; |
| } else { |
| mList = new Locale[1]; |
| mList[0] = (Locale) locale.clone(); |
| mStringRepresentation = locale.toLanguageTag(); |
| } |
| } |
| |
| /** |
| * @throws NullPointerException if any of the input locales is <code>null</code>. |
| * @throws IllegalArgumentException if any of the input locales repeat. |
| */ |
| public LocaleList(@Nullable Locale[] list) { |
| if (list == null || list.length == 0) { |
| mList = sEmptyList; |
| mStringRepresentation = ""; |
| } else { |
| final Locale[] localeList = new Locale[list.length]; |
| final HashSet<Locale> seenLocales = new HashSet<Locale>(); |
| final StringBuilder sb = new StringBuilder(); |
| for (int i = 0; i < list.length; ++i) { |
| final Locale l = list[i]; |
| if (l == null) { |
| throw new NullPointerException(); |
| } else if (seenLocales.contains(l)) { |
| throw new IllegalArgumentException(); |
| } else { |
| final Locale localeClone = (Locale) l.clone(); |
| localeList[i] = localeClone; |
| sb.append(localeClone.toLanguageTag()); |
| if (i < list.length - 1) { |
| sb.append(','); |
| } |
| seenLocales.add(localeClone); |
| } |
| } |
| mList = localeList; |
| mStringRepresentation = sb.toString(); |
| } |
| } |
| |
| public static LocaleList getEmptyLocaleList() { |
| return sEmptyLocaleList; |
| } |
| |
| public static LocaleList forLanguageTags(@Nullable String list) { |
| if (list == null || list.equals("")) { |
| return getEmptyLocaleList(); |
| } else { |
| final String[] tags = list.split(","); |
| final Locale[] localeArray = new Locale[tags.length]; |
| for (int i = 0; i < localeArray.length; ++i) { |
| localeArray[i] = Locale.forLanguageTag(tags[i]); |
| } |
| return new LocaleList(localeArray); |
| } |
| } |
| |
| @Nullable |
| public Locale getBestMatch(String[] locales) { |
| // TODO: Fix this to actually do locale negotiation and choose the best match |
| return getPrimary(); |
| } |
| |
| private final static Object sLock = new Object(); |
| |
| @GuardedBy("sLock") |
| private static LocaleList sDefaultLocaleList; |
| |
| // TODO: fix this to return the default system locale list once we have that |
| @NonNull @Size(min=1) |
| public static LocaleList getDefault() { |
| Locale defaultLocale = Locale.getDefault(); |
| synchronized (sLock) { |
| if (sDefaultLocaleList == null || sDefaultLocaleList.size() != 1 |
| || !defaultLocale.equals(sDefaultLocaleList.getPrimary())) { |
| sDefaultLocaleList = new LocaleList(defaultLocale); |
| } |
| } |
| return sDefaultLocaleList; |
| } |
| } |