LocaleSpanCompatUtils.java revision a92fead202aebdc5e98ce0b24aa9029b46a1e8d2 
1/*
2 * Copyright (C) 2014 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.inputmethod.compat;
18
19import com.android.inputmethod.annotations.UsedForTesting;
20import com.android.inputmethod.compat.CompatUtils;
21
22import java.lang.reflect.Constructor;
23import java.lang.reflect.Method;
24import java.util.Locale;
25
26@UsedForTesting
27public final class LocaleSpanCompatUtils {
28    // Note that LocaleSpan(Locale locale) has been introduced in API level 17
29    // (Build.VERSION_CODE.JELLY_BEAN_MR1).
30    private static Class<?> getLocalSpanClass() {
31        try {
32            return Class.forName("android.text.style.LocaleSpan");
33        } catch (ClassNotFoundException e) {
34            return null;
35        }
36    }
37    private static final Constructor<?> LOCALE_SPAN_CONSTRUCTOR;
38    private static final Method LOCALE_SPAN_GET_LOCALE;
39    static {
40        final Class<?> localeSpanClass = getLocalSpanClass();
41        LOCALE_SPAN_CONSTRUCTOR = CompatUtils.getConstructor(localeSpanClass, Locale.class);
42        LOCALE_SPAN_GET_LOCALE = CompatUtils.getMethod(localeSpanClass, "getLocale");
43    }
44
45    @UsedForTesting
46    public static boolean isLocaleSpanAvailable() {
47        return (LOCALE_SPAN_CONSTRUCTOR != null && LOCALE_SPAN_GET_LOCALE != null);
48    }
49
50    @UsedForTesting
51    public static Object newLocaleSpan(final Locale locale) {
52        return CompatUtils.newInstance(LOCALE_SPAN_CONSTRUCTOR, locale);
53    }
54
55    @UsedForTesting
56    public static Locale getLocaleFromLocaleSpan(final Object localeSpan) {
57        return (Locale) CompatUtils.invoke(localeSpan, null, LOCALE_SPAN_GET_LOCALE);
58    }
59}
60