Merge changes from topic "DateIntervalFormat"

/*

 * Copyright (C) 2013 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.text.format;

import static android.text.format.DateUtilsBridge.FORMAT_UTC;

import static com.android.internal.annotations.VisibleForTesting.Visibility.PACKAGE;

import android.icu.util.Calendar;

import android.icu.util.ULocale;

import android.util.LruCache;

import com.android.internal.annotations.VisibleForTesting;

import java.text.FieldPosition;

import java.util.TimeZone;

/**

 * A wrapper of {@link android.icu.text.DateIntervalFormat} used by {@link DateUtilsBridge}.

 *

 * @hide

 */

@VisibleForTesting(visibility = PACKAGE)

public final class DateIntervalFormat {

    private static final LruCache<String, android.icu.text.DateIntervalFormat> CACHED_FORMATTERS =

            new LruCache<>(8);

    private DateIntervalFormat() {

    }

    /**

     * Format a date range.

     */

    @VisibleForTesting(visibility = PACKAGE)

    public static String formatDateRange(long startMs, long endMs, int flags, String olsonId) {

        if ((flags & FORMAT_UTC) != 0) {

            olsonId = "UTC";

        }

        // We create a java.util.TimeZone here to use libcore's data and libcore's olson ID /

        // pseudo-tz logic.

        TimeZone tz = (olsonId != null) ? TimeZone.getTimeZone(olsonId) : TimeZone.getDefault();

        android.icu.util.TimeZone icuTimeZone = DateUtilsBridge.icuTimeZone(tz);

        ULocale icuLocale = ULocale.getDefault();

        return formatDateRange(icuLocale, icuTimeZone, startMs, endMs, flags);

    }

    /**

     * Format a date range. This is our slightly more sensible internal API.

     * A truly sane replacement would take a skeleton instead of int flags.

     */

    @VisibleForTesting(visibility = PACKAGE)

    public static String formatDateRange(ULocale icuLocale, android.icu.util.TimeZone icuTimeZone,

            long startMs, long endMs, int flags) {

        Calendar startCalendar = DateUtilsBridge.createIcuCalendar(icuTimeZone, icuLocale, startMs);

        Calendar endCalendar;

        if (startMs == endMs) {

            endCalendar = startCalendar;

        } else {

            endCalendar = DateUtilsBridge.createIcuCalendar(icuTimeZone, icuLocale, endMs);

        }

        // Special handling when the range ends at midnight:

        // - If we're not showing times, and the range is non-empty, we fudge the end date so we

        // don't count the day that's about to start.

        // - If we are showing times, and the range ends at exactly 00:00 of the day following

        // its start (which can be thought of as 24:00 the same day), we fudge the end date so we

        // don't show the dates --- unless the start is anything displayed as 00:00, in which case

        // we include both dates to disambiguate.

        // This is not the behavior of icu4j's DateIntervalFormat, but it's the required behavior

        // of Android's DateUtils.formatDateRange.

        if (isExactlyMidnight(endCalendar)) {

            boolean showTime =

                    (flags & DateUtilsBridge.FORMAT_SHOW_TIME) == DateUtilsBridge.FORMAT_SHOW_TIME;

            boolean endsDayAfterStart = DateUtilsBridge.dayDistance(startCalendar, endCalendar)

                    == 1;

            if ((!showTime && startMs != endMs)

                    || (endsDayAfterStart

                    && !DateUtilsBridge.isDisplayMidnightUsingSkeleton(startCalendar))) {

                endCalendar.add(Calendar.DAY_OF_MONTH, -1);

            }

        }

        String skeleton = DateUtilsBridge.toSkeleton(startCalendar, endCalendar, flags);

        synchronized (CACHED_FORMATTERS) {

            android.icu.text.DateIntervalFormat formatter =

                    getFormatter(skeleton, icuLocale, icuTimeZone);

            return formatter.format(startCalendar, endCalendar, new StringBuffer(),

                    new FieldPosition(0)).toString();

        }

    }

    private static android.icu.text.DateIntervalFormat getFormatter(String skeleton, ULocale locale,

            android.icu.util.TimeZone icuTimeZone) {

        String key = skeleton + "\t" + locale + "\t" + icuTimeZone;

        android.icu.text.DateIntervalFormat formatter = CACHED_FORMATTERS.get(key);

        if (formatter != null) {

            return formatter;

        }

        formatter = android.icu.text.DateIntervalFormat.getInstance(skeleton, locale);

        formatter.setTimeZone(icuTimeZone);

        CACHED_FORMATTERS.put(key, formatter);

        return formatter;

    }

    private static boolean isExactlyMidnight(Calendar c) {

        return c.get(Calendar.HOUR_OF_DAY) == 0

                && c.get(Calendar.MINUTE) == 0

                && c.get(Calendar.SECOND) == 0

                && c.get(Calendar.MILLISECOND) == 0;

    }

}

import com.android.internal.R;

import libcore.icu.DateIntervalFormat;

import libcore.icu.LocaleData;

import java.io.IOException;