/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.myfaces.tobago.internal.util;
import javax.faces.convert.ConverterException;
import javax.faces.convert.DateTimeConverter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Locale;
/**
* This code is taken from myfaces core.
* TODO: Should be sharable (e.g. myfaces-commons).
* <p/>
*/
public class DateFormatUtils {
private static final String TYPE_DATE = "date";
private static final String TYPE_TIME = "time";
private static final String TYPE_BOTH = "both";
private static final String STYLE_DEFAULT = "default";
private static final String STYLE_MEDIUM = "medium";
private static final String STYLE_SHORT = "short";
private static final String STYLE_LONG = "long";
private static final String STYLE_FULL = "full";
private DateFormatUtils() {
}
/**
* Find a pattern for the converter.
* Returns the pattern inside the converter, if any.
* Otherwise compute the pattern.
*
* @return the patter or null, if DateFormat.getDateInstance() returns no SimpleDateFormat.
*/
public static String findPattern(DateTimeConverter converter) {
String pattern = converter.getPattern();
if (pattern == null) {
DateFormat dateFormat = getDateFormat(
converter.getType(), converter.getDateStyle(),
converter.getTimeStyle(), converter.getLocale());
if (dateFormat instanceof SimpleDateFormat) {
SimpleDateFormat format = (SimpleDateFormat) dateFormat;
pattern = format.toPattern();
}
}
return pattern;
}
public static DateFormat getDateFormat(String type, String dateStyle, String timeStyle, Locale locale) {
DateFormat format;
if (type.equals(TYPE_DATE)) {
format = DateFormat.getDateInstance(calcStyle(dateStyle), locale);
} else if (type.equals(TYPE_TIME)) {
format = DateFormat.getTimeInstance(calcStyle(timeStyle), locale);
} else if (type.equals(TYPE_BOTH)) {
format = DateFormat.getDateTimeInstance(calcStyle(dateStyle),
calcStyle(timeStyle),
locale);
} else {
throw new ConverterException("invalid type '" + type + "'");
}
// format cannot be lenient (JSR-127)
format.setLenient(false);
return format;
}
private static int calcStyle(String name) {
if (name.equals(STYLE_DEFAULT)) {
return DateFormat.DEFAULT;
}
if (name.equals(STYLE_MEDIUM)) {
return DateFormat.MEDIUM;
}
if (name.equals(STYLE_SHORT)) {
return DateFormat.SHORT;
}
if (name.equals(STYLE_LONG)) {
return DateFormat.LONG;
}
if (name.equals(STYLE_FULL)) {
return DateFormat.FULL;
}
throw new ConverterException("invalid style '" + name + "'");
}
}