| /* |
| * 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.cocoon.woody.datatype.convertor; |
| |
| import java.util.Locale; |
| import java.util.Date; |
| import java.text.DateFormat; |
| import java.text.ParseException; |
| import java.text.SimpleDateFormat; |
| |
| /** |
| * A Convertor for {@link java.util.Date Date} objects backed by the |
| * {@link java.text.SimpleDateFormat SimpleDateFormat} class. |
| * |
| * <p>It can be configured to use one of three <strong>variants</strong>: date, |
| * time or datetime and one of four <strong>styles</strong>: long, full, medium or short. |
| * |
| * <p>Alternatively, a <strong>formatting pattern</strong> can be used. This can either be a locale-dependent |
| * or locale-independent formatting pattern. When looking up a formatting pattern, a mechansim |
| * similar to resource bundle lookup is used. Suppose the locale is nl-BE, then first a formatting |
| * pattern for nl-BE will be sought, then one for nl, and if that is not |
| * found, finally the locale-independent formatting pattern will be used. |
| * |
| * <p><strong>NOTE:</strong> the earlier statement about the fact that this class uses java.text.SimpleDateFormat |
| * is not entirely correct. In fact, it uses a small wrapper class that will either delegate to |
| * java.text.SimpleDateFormat or com.ibm.icu.text.SimpleDateFormat. The com.ibm version will automatically |
| * be used if it is present on the classpath, otherwise the java.text version will be used. |
| * |
| * @version CVS $Id$ |
| */ |
| public class FormattingDateConvertor implements Convertor { |
| /** See {@link #setStyle}. */ |
| private int style; |
| /** See {@link #setVariant}. */ |
| private int variant; |
| /** Locale-specific formatting patterns. */ |
| private LocaleMap localizedPatterns; |
| /** Non-locale specific formatting pattern. */ |
| private String nonLocalizedPattern; |
| |
| public static final int DATE = 1; |
| public static final int TIME = 2; |
| public static final int DATE_TIME = 3; |
| |
| public FormattingDateConvertor() { |
| this.style = java.text.DateFormat.SHORT; |
| this.variant = DATE; |
| this.localizedPatterns = new LocaleMap(); |
| } |
| |
| public Object convertFromString(String value, Locale locale, Convertor.FormatCache formatCache) { |
| DateFormat dateFormat = getDateFormat(locale, formatCache); |
| try { |
| return dateFormat.parse(value); |
| } catch (ParseException e) { |
| return null; |
| } |
| } |
| |
| public String convertToString(Object value, Locale locale, Convertor.FormatCache formatCache) { |
| DateFormat dateFormat = getDateFormat(locale, formatCache); |
| return dateFormat.format((Date)value); |
| } |
| |
| private final DateFormat getDateFormat(Locale locale, Convertor.FormatCache formatCache) { |
| DateFormat dateFormat = null; |
| if (formatCache != null) |
| dateFormat = (DateFormat)formatCache.get(); |
| if (dateFormat == null) { |
| dateFormat = getDateFormat(locale); |
| if (formatCache != null) |
| formatCache.store(dateFormat); |
| } |
| return dateFormat; |
| } |
| |
| protected DateFormat getDateFormat(Locale locale) { |
| SimpleDateFormat dateFormat = null; |
| |
| switch (variant) { |
| case DATE: |
| dateFormat = (SimpleDateFormat)DateFormat.getDateInstance(style, locale); |
| break; |
| case TIME: |
| dateFormat = (SimpleDateFormat)DateFormat.getTimeInstance(style, locale); |
| break; |
| case DATE_TIME: |
| dateFormat = (SimpleDateFormat)DateFormat.getDateTimeInstance(style, style, locale); |
| break; |
| } |
| |
| String pattern = (String)localizedPatterns.get(locale); |
| |
| if (pattern != null) |
| // Note: this was previously using applyLocalizedPattern() which allows to use |
| // a locale-specific pattern syntax, e.g. in french "j" (jour) for "d" and |
| // "a" (annee) for "y". But the localized pattern syntax is very little known and thus |
| // led to some weird pattern syntax error messages. |
| dateFormat.applyPattern(pattern); |
| else if (nonLocalizedPattern != null) |
| dateFormat.applyPattern(nonLocalizedPattern); |
| |
| return dateFormat; |
| } |
| |
| public Class getTypeClass() { |
| return Date.class; |
| } |
| |
| /** |
| * |
| * @param style one of the constants FULL, LONG, MEDIUM or SHORT defined in the {@link Date} class. |
| */ |
| public void setStyle(int style) { |
| this.style = style; |
| } |
| |
| public void setVariant(int variant) { |
| if (variant != DATE && variant != TIME && variant != DATE_TIME) |
| throw new IllegalArgumentException("Invalid value for variant parameter."); |
| this.variant = variant; |
| } |
| |
| public void addFormattingPattern(Locale locale, String pattern) { |
| localizedPatterns.put(locale, pattern); |
| } |
| |
| public void setNonLocalizedPattern(String pattern) { |
| this.nonLocalizedPattern = pattern; |
| } |
| } |