FormatDateSupport.java
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org.apache.taglibs.standard.tag.common.fmt |
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Jakarta Taglibs |
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/*
* 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.taglibs.standard.tag.common.fmt;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.Collections;
import java.util.Map;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.taglibs.standard.resources.Resources;
import org.apache.taglibs.standard.tag.common.core.Util;
import org.apache.taglibs.standard.extra.commons.collections.map.LRUMap;
/**
* Support for tag handlers for <formatDate>, the date and time
* formatting tag in JSTL 1.0.
*
* @author Jan Luehe
*/
public abstract class FormatDateSupport extends TagSupport {
//*********************************************************************
// Private constants
/**
* Name of configuration setting for maximum number of entries in the
* cached dateformat map
*/
private static final String DATE_CACHE_PARAM =
"org.apache.taglibs.standard.tag.common.fmt.dateFormatCacheSize";
private static final String DATE = "date";
private static final String TIME = "time";
private static final String DATETIME = "both";
private static Map dateFormatCache = null;
/**
* Default maximum cache size
*/
private static final int MAX_SIZE = 100;
//*********************************************************************
// Protected state
protected Date value; // 'value' attribute
protected String type; // 'type' attribute
protected String pattern; // 'pattern' attribute
protected Object timeZone; // 'timeZone' attribute
protected String dateStyle; // 'dateStyle' attribute
protected String timeStyle; // 'timeStyle' attribute
//*********************************************************************
// Private state
private String var; // 'var' attribute
private int scope; // 'scope' attribute
//*********************************************************************
// Constructor and initialization
public FormatDateSupport() {
super();
init();
}
private void init() {
type = dateStyle = timeStyle = null;
pattern = var = null;
value = null;
timeZone = null;
scope = PageContext.PAGE_SCOPE;
}
//*********************************************************************
// Tag attributes known at translation time
public void setVar(String var) {
this.var = var;
}
public void setScope(String scope) {
this.scope = Util.getScope(scope);
}
//*********************************************************************
// Tag logic
/*
* Formats the given date and time.
*/
public int doEndTag() throws JspException {
String formatted = null;
if (value == null) {
if (var != null) {
pageContext.removeAttribute(var, scope);
}
return EVAL_PAGE;
}
// Create formatter
Locale locale = SetLocaleSupport.getFormattingLocale(
pageContext,
this,
true,
DateFormat.getAvailableLocales());
if (locale != null) {
DateFormat formatter = createFormatter(locale, pattern);
// Set time zone
TimeZone tz = null;
if ((timeZone instanceof String)
&& ((String) timeZone).equals("")) {
timeZone = null;
}
if (timeZone != null) {
if (timeZone instanceof String) {
tz = TimeZone.getTimeZone((String) timeZone);
} else if (timeZone instanceof TimeZone) {
tz = (TimeZone) timeZone;
} else {
throw new JspTagException(
Resources.getMessage("FORMAT_DATE_BAD_TIMEZONE"));
}
} else {
tz = TimeZoneSupport.getTimeZone(pageContext, this);
}
if (tz != null) {
formatter.setTimeZone(tz);
}
formatted = formatter.format(value);
} else {
// no formatting locale available, use Date.toString()
formatted = value.toString();
}
if (var != null) {
pageContext.setAttribute(var, formatted, scope);
} else {
try {
pageContext.getOut().print(formatted);
} catch (IOException ioe) {
throw new JspTagException(ioe.toString(), ioe);
}
}
return EVAL_PAGE;
}
// Releases any resources we may have (or inherit)
public void release() {
init();
}
//*********************************************************************
// Private utility methods
private DateFormat createFormatter(Locale loc, String pattern) throws JspException {
DateFormat formatter = null;
// lazy initialization of cache
if (dateFormatCache == null) {
String value = pageContext.getServletContext().getInitParameter(DATE_CACHE_PARAM);
if (value != null) {
dateFormatCache = Collections.synchronizedMap(new LRUMap(Integer.parseInt(value)));
} else {
dateFormatCache = Collections.synchronizedMap(new LRUMap(MAX_SIZE));
}
}
// Apply pattern, if present
if (pattern != null) {
if ((type == null) || DATE.equalsIgnoreCase(type)) {
String key = DATE + pattern + loc;
formatter = (DateFormat) dateFormatCache.get(key);
if(formatter == null) {
formatter = new SimpleDateFormat(pattern, loc);
dateFormatCache.put(key, formatter);
}
} else if (TIME.equalsIgnoreCase(type)) {
String key = TIME + pattern + loc;
formatter = (DateFormat) dateFormatCache.get(key);
if(formatter == null) {
formatter = new SimpleDateFormat(pattern, loc);
dateFormatCache.put(key, formatter);
}
} else if (DATETIME.equalsIgnoreCase(type)) {
String key = DATETIME + pattern + loc;
formatter = (DateFormat) dateFormatCache.get(key);
if(formatter == null) {
formatter = new SimpleDateFormat(pattern, loc);
dateFormatCache.put(key, formatter);
}
} else {
throw new JspException(
Resources.getMessage("FORMAT_DATE_INVALID_TYPE",
type));
}
return formatter;
}
if ((type == null) || DATE.equalsIgnoreCase(type)) {
int style = Util.getStyle(dateStyle, "FORMAT_DATE_INVALID_DATE_STYLE");
String key = DATE + style + loc;
formatter = (DateFormat) dateFormatCache.get(key);
if(formatter == null) {
formatter = DateFormat.getDateInstance(style, loc);
dateFormatCache.put(key, formatter);
}
} else if (TIME.equalsIgnoreCase(type)) {
int style = Util.getStyle(timeStyle, "FORMAT_DATE_INVALID_TIME_STYLE");
String key = TIME + style + loc;
formatter = (DateFormat) dateFormatCache.get(key);
if(formatter == null) {
formatter = DateFormat.getTimeInstance(style, loc);
dateFormatCache.put(key, formatter);
}
} else if (DATETIME.equalsIgnoreCase(type)) {
int style1 = Util.getStyle(dateStyle, "FORMAT_DATE_INVALID_DATE_STYLE");
int style2 = Util.getStyle(timeStyle, "FORMAT_DATE_INVALID_TIME_STYLE");
String key = DATETIME + style1 + loc + style2;
formatter = (DateFormat) dateFormatCache.get(key);
if(formatter == null) {
formatter = DateFormat.getDateTimeInstance(style1, style2, loc);
dateFormatCache.put(key, formatter);
}
} else {
throw new JspException(
Resources.getMessage("FORMAT_DATE_INVALID_TYPE",
type));
}
return formatter;
}
}
The table below shows all metrics for FormatDateSupport.java.
| Metric | Value | Description | |
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