65 lines
2.1 KiB
Java
65 lines
2.1 KiB
Java
/*
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* Copyright (C) 2017 The Gson authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.internal;
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import java.text.DateFormat;
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import java.text.SimpleDateFormat;
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import java.util.Locale;
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/** Provides DateFormats for US locale with patterns which were the default ones before Java 9. */
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public class PreJava9DateFormatProvider {
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private PreJava9DateFormatProvider() {}
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/**
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* Returns the same DateFormat as {@code DateFormat.getDateTimeInstance(dateStyle, timeStyle,
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* Locale.US)} in Java 8 or below.
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*/
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public static DateFormat getUsDateTimeFormat(int dateStyle, int timeStyle) {
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String pattern =
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getDatePartOfDateTimePattern(dateStyle) + " " + getTimePartOfDateTimePattern(timeStyle);
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return new SimpleDateFormat(pattern, Locale.US);
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}
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private static String getDatePartOfDateTimePattern(int dateStyle) {
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switch (dateStyle) {
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case DateFormat.SHORT:
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return "M/d/yy";
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case DateFormat.MEDIUM:
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return "MMM d, yyyy";
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case DateFormat.LONG:
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return "MMMM d, yyyy";
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case DateFormat.FULL:
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return "EEEE, MMMM d, yyyy";
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default:
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throw new IllegalArgumentException("Unknown DateFormat style: " + dateStyle);
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}
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}
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private static String getTimePartOfDateTimePattern(int timeStyle) {
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switch (timeStyle) {
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case DateFormat.SHORT:
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return "h:mm a";
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case DateFormat.MEDIUM:
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return "h:mm:ss a";
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case DateFormat.FULL:
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case DateFormat.LONG:
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return "h:mm:ss a z";
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default:
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throw new IllegalArgumentException("Unknown DateFormat style: " + timeStyle);
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}
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}
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}
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