com.google.gson.internal.PreJava9DateFormatProvider Maven / Gradle / Ivy
/*
* Copyright (C) 2017 The Gson authors
*
* 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.google.gson.internal;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
/**
* Provides DateFormats for US locale with patterns which were the default ones before Java 9.
*/
public class PreJava9DateFormatProvider {
/**
* Returns the same DateFormat as {@code DateFormat.getDateInstance(style, Locale.US)} in Java 8 or below.
*/
public static DateFormat getUSDateFormat(int style) {
return new SimpleDateFormat(getDateFormatPattern(style), Locale.US);
}
/**
* Returns the same DateFormat as {@code DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.US)}
* in Java 8 or below.
*/
public static DateFormat getUSDateTimeFormat(int dateStyle, int timeStyle) {
String pattern = getDatePartOfDateTimePattern(dateStyle) + " " + getTimePartOfDateTimePattern(timeStyle);
return new SimpleDateFormat(pattern, Locale.US);
}
private static String getDateFormatPattern(int style) {
switch (style) {
case DateFormat.SHORT:
return "M/d/yy";
case DateFormat.MEDIUM:
return "MMM d, y";
case DateFormat.LONG:
return "MMMM d, y";
case DateFormat.FULL:
return "EEEE, MMMM d, y";
default:
throw new IllegalArgumentException("Unknown DateFormat style: " + style);
}
}
private static String getDatePartOfDateTimePattern(int dateStyle) {
switch (dateStyle) {
case DateFormat.SHORT:
return "M/d/yy";
case DateFormat.MEDIUM:
return "MMM d, yyyy";
case DateFormat.LONG:
return "MMMM d, yyyy";
case DateFormat.FULL:
return "EEEE, MMMM d, yyyy";
default:
throw new IllegalArgumentException("Unknown DateFormat style: " + dateStyle);
}
}
private static String getTimePartOfDateTimePattern(int timeStyle) {
switch (timeStyle) {
case DateFormat.SHORT:
return "h:mm a";
case DateFormat.MEDIUM:
return "h:mm:ss a";
case DateFormat.FULL:
case DateFormat.LONG:
return "h:mm:ss a z";
default:
throw new IllegalArgumentException("Unknown DateFormat style: " + timeStyle);
}
}
}