android-34/com/android/icu/util/CaseMapperNative.java

/*
 * Copyright (C) 2019 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 com.android.icu.util;

import java.util.Locale;
import libcore.api.IntraCoreApi;

/**
 * Provide functionalities implemented by ICU4C for {@link java.lang.String}, which avoids using
 * {@link android.icu.lang.UCharacter} to prevent circular runtime dependency.
 *
 * @hide
 */
@IntraCoreApi
public class CaseMapperNative {

    private CaseMapperNative() {}

    /**
     * Returns the lower-case version of the string in the {@code locale}.
     *
     * Behaves the same as {@link android.icu.lang.UCharacter#toLowerCase(Locale, String)}, but
     * implemented by ICU4C.
     *
     * @hide
     */
    @IntraCoreApi
    public static String toLowerCase(String s, Locale locale) {
        return toLowerCase(s, locale.toLanguageTag());
    }

    private static native String toLowerCase(String s, String languageTag);

    /**
     * Returns the upper-case version of the string in the {@code locale}.
     *
     * Behaves the same as {@link android.icu.lang.UCharacter#toUpperCase(Locale, String)}, but
     * implemented by ICU4C.
     *
     * @hide
     */
    @IntraCoreApi
    public static String toUpperCase(String s, Locale locale) {
        return toUpperCase(s, locale.toLanguageTag());
    }

    private static native String toUpperCase(String s, String languageTag);

}