/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jstl.el;
import com.caucho.el.Expr;
import com.caucho.jsp.PageContextImpl;
import com.caucho.util.L10N;
import javax.el.ELContext;
import javax.el.ELException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.jstl.core.Config;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;
/**
* Formats an i18n date and prints it.
*/
public class ParseDateTag extends BodyTagSupport {
private static L10N L = new L10N(ParseDateTag.class);
private Expr _valueExpr;
private Expr _typeExpr;
private Expr _dateStyleExpr;
private Expr _timeStyleExpr;
private Expr _parseLocaleExpr;
private Expr _patternExpr;
private Expr _timeZoneExpr;
private String _var;
private String _scope;
/**
* Sets the formatting value.
*
* @param value the JSP-EL expression for the value.
*/
public void setValue(Expr value)
{
_valueExpr = value;
}
/**
* Sets the date/time type.
*
* @param type the date/time type.
*/
public void setType(Expr type)
{
_typeExpr = type;
}
/**
* Sets the date style (full, short, etc.)
*
* @param style the date style
*/
public void setDateStyle(Expr style)
{
_dateStyleExpr = style;
}
/**
* Sets the time style (full, short, etc.)
*
* @param style the time style
*/
public void setTimeStyle(Expr style)
{
_timeStyleExpr = style;
}
/**
* Sets the formatting pattern.
*
* @param pattern the formatting pattern.
*/
public void setPattern(Expr pattern)
{
_patternExpr = pattern;
}
/**
* Sets the time zone.
*
* @param zone the time zone expression
*/
public void setTimeZone(Expr zone)
{
_timeZoneExpr = zone;
}
/**
* Sets the parse locale
*
* @param locale the locale
*/
public void setParseLocale(Expr locale)
{
_parseLocaleExpr = locale;
}
/**
* Sets the variable name.
*
* @param var the variable name to store the value in.
*/
public void setVar(String var)
{
_var = var;
}
/**
* Sets the variable scope.
*
* @param scope the variable scope to store the value in.
*/
public void setScope(String scope)
{
_scope = scope;
}
/**
* Process the tag.
*/
public int doEndTag()
throws JspException
{
try {
PageContextImpl pageContext = (PageContextImpl) this.pageContext;
JspWriter out = pageContext.getOut();
String string;
if (_valueExpr != null)
string = _valueExpr.evalString(pageContext.getELContext());
else
string = bodyContent.getString().trim();
DateFormat format = getFormat();
Object value = format.parse(string);
if (_var == null)
out.print(value);
else
CoreSetTag.setValue(pageContext, _var, _scope, value);
} catch (IOException e) {
} catch (ParseException e) {
throw new JspException(e);
} catch (ELException e) {
throw new JspException(e);
}
return EVAL_PAGE;
}
protected DateFormat getFormat()
throws JspException, ELException
{
PageContextImpl pageContext = (PageContextImpl) this.pageContext;
ELContext env = pageContext.getELContext();
DateFormat format = null;
Locale locale = null;
if (_parseLocaleExpr != null) {
Object localeObj = _parseLocaleExpr.evalObject(env);
if (localeObj instanceof Locale)
locale = (Locale) localeObj;
else if (localeObj instanceof String)
locale = pageContext.getLocale((String) localeObj, null);
}
if (locale == null)
locale = pageContext.getLocale();
String type = null;
if (_typeExpr != null)
type = _typeExpr.evalString(env);
int dateStyle = DateFormat.DEFAULT;
if (_dateStyleExpr != null)
dateStyle = getDateStyle(_dateStyleExpr.evalString(env));
int timeStyle = DateFormat.DEFAULT;
if (_timeStyleExpr != null)
timeStyle = getDateStyle(_timeStyleExpr.evalString(env));
if (locale != null) {
if (type == null || type.equals("date"))
format = DateFormat.getDateInstance(dateStyle, locale);
else if (type.equals("both"))
format = DateFormat.getDateTimeInstance(dateStyle,
timeStyle,
locale);
else if (type.equals("time"))
format = DateFormat.getTimeInstance(timeStyle, locale);
else
throw new JspException(L.l("illegal type `{0}'", type));
}
else {
if (type == null || type.equals("date"))
format = DateFormat.getDateInstance(dateStyle);
else if (type.equals("both"))
format = DateFormat.getDateTimeInstance(dateStyle, timeStyle);
else if (type.equals("time"))
format = DateFormat.getTimeInstance(timeStyle);
else
throw new JspException(L.l("illegal type `{0}'", type));
}
if (format == null)
return null;
if (_patternExpr != null) {
String pattern = _patternExpr.evalString(env);
try {
((SimpleDateFormat) format).applyPattern(pattern);
} catch (ClassCastException e) {
format = new SimpleDateFormat(pattern, locale);
}
}
TimeZone timeZone = getTimeZone();
if (timeZone != null)
format.setTimeZone(timeZone);
return format;
}
private TimeZone getTimeZone()
throws ELException
{
if (_timeZoneExpr != null) {
PageContextImpl pageContext = (PageContextImpl) this.pageContext;
Object timeZoneObj = _timeZoneExpr.evalObject(pageContext.getELContext());
TimeZone zone = getTimeZone(timeZoneObj);
if (zone != null)
return zone;
}
Object timeZoneObj = pageContext.getAttribute("com.caucho.time-zone");
if (timeZoneObj != null)
return (TimeZone) timeZoneObj;
timeZoneObj = Config.find(pageContext, Config.FMT_TIME_ZONE);
return getTimeZone(timeZoneObj);
}
private TimeZone getTimeZone(Object timeZoneObj)
{
if (timeZoneObj instanceof TimeZone)
return (TimeZone) timeZoneObj;
else if (timeZoneObj instanceof String) {
String timeZoneString = (String) timeZoneObj;
return TimeZone.getTimeZone(timeZoneString);
}
return null;
}
public static int getDateStyle(String style)
throws JspException
{
if (style == null || style.equals("default"))
return DateFormat.DEFAULT;
else if (style.equals("short"))
return DateFormat.SHORT;
else if (style.equals("medium"))
return DateFormat.MEDIUM;
else if (style.equals("long"))
return DateFormat.LONG;
else if (style.equals("full"))
return DateFormat.FULL;
else
throw new JspException(L.l("illegal date style `{0}'", style));
}
}