001 package org.apache.myfaces.tobago.util; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one or more 005 * contributor license agreements. See the NOTICE file distributed with 006 * this work for additional information regarding copyright ownership. 007 * The ASF licenses this file to You under the Apache License, Version 2.0 008 * (the "License"); you may not use this file except in compliance with 009 * the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, software 014 * distributed under the License is distributed on an "AS IS" BASIS, 015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 016 * See the License for the specific language governing permissions and 017 * limitations under the License. 018 */ 019 020 import javax.faces.convert.ConverterException; 021 import javax.faces.convert.DateTimeConverter; 022 import java.text.DateFormat; 023 import java.text.SimpleDateFormat; 024 import java.util.Locale; 025 026 /** 027 * This code is taken from myfaces core. 028 * TODO: Should be sharable (e.g. myfaces-commons). 029 * <p/> 030 * User: lofwyr 031 * Date: 06.11.2006 17:20:29 032 */ 033 public class DateFormatUtils { 034 035 private static final String TYPE_DATE = "date"; 036 private static final String TYPE_TIME = "time"; 037 private static final String TYPE_BOTH = "both"; 038 private static final String STYLE_DEFAULT = "default"; 039 private static final String STYLE_MEDIUM = "medium"; 040 private static final String STYLE_SHORT = "short"; 041 private static final String STYLE_LONG = "long"; 042 private static final String STYLE_FULL = "full"; 043 044 private DateFormatUtils() { 045 } 046 047 /** 048 * Find a pattern for the converter. 049 * Returns the pattern inside the converter, if any. 050 * Otherwise compute the pattern. 051 * 052 * @return the patter or null, if DateFormat.getDateInstance() returns no SimpleDateFormat. 053 */ 054 public static String findPattern(DateTimeConverter converter) { 055 String pattern = converter.getPattern(); 056 057 if (pattern == null) { 058 DateFormat dateFormat = getDateFormat( 059 converter.getType(), converter.getDateStyle(), 060 converter.getTimeStyle(), converter.getLocale()); 061 if (dateFormat instanceof SimpleDateFormat) { 062 SimpleDateFormat format = (SimpleDateFormat) dateFormat; 063 pattern = format.toPattern(); 064 } 065 } 066 067 return pattern; 068 } 069 070 public static DateFormat getDateFormat(String type, String dateStyle, String timeStyle, Locale locale) { 071 DateFormat format; 072 if (type.equals(TYPE_DATE)) { 073 format = DateFormat.getDateInstance(calcStyle(dateStyle), locale); 074 } else if (type.equals(TYPE_TIME)) { 075 format = DateFormat.getTimeInstance(calcStyle(timeStyle), locale); 076 } else if (type.equals(TYPE_BOTH)) { 077 format = DateFormat.getDateTimeInstance(calcStyle(dateStyle), 078 calcStyle(timeStyle), 079 locale); 080 } else { 081 throw new ConverterException("invalid type '" + type + "'"); 082 } 083 084 // format cannot be lenient (JSR-127) 085 format.setLenient(false); 086 return format; 087 } 088 089 private static int calcStyle(String name) { 090 if (name.equals(STYLE_DEFAULT)) { 091 return DateFormat.DEFAULT; 092 } 093 if (name.equals(STYLE_MEDIUM)) { 094 return DateFormat.MEDIUM; 095 } 096 if (name.equals(STYLE_SHORT)) { 097 return DateFormat.SHORT; 098 } 099 if (name.equals(STYLE_LONG)) { 100 return DateFormat.LONG; 101 } 102 if (name.equals(STYLE_FULL)) { 103 return DateFormat.FULL; 104 } 105 106 throw new ConverterException("invalid style '" + name + "'"); 107 } 108 109 }