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Jakarta Standard Tag Library Implementation
/*
* Copyright (c) 1997-2020 Oracle and/or its affiliates. All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import jakarta.servlet.jsp.JspException;
import jakarta.servlet.jsp.JspTagException;
import jakarta.servlet.jsp.PageContext;
import jakarta.servlet.jsp.tagext.BodyTagSupport;
import org.apache.taglibs.standard.resources.Resources;
import org.apache.taglibs.standard.tag.common.core.Util;
/**
* Support for tag handlers for <parseDate>, the date and time
* parsing tag in JSTL 1.0.
*
* @author Jan Luehe
*/
public abstract class ParseDateSupport extends BodyTagSupport {
//*********************************************************************
// Private constants
private static final String DATE = "date";
private static final String TIME = "time";
private static final String DATETIME = "both";
//*********************************************************************
// Protected state
protected String value; // 'value' attribute
protected boolean valueSpecified; // status
protected String type; // 'type' attribute
protected String pattern; // 'pattern' attribute
protected Object timeZone; // 'timeZone' attribute
protected Locale parseLocale; // 'parseLocale' 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 ParseDateSupport() {
super();
init();
}
private void init() {
type = dateStyle = timeStyle = null;
value = pattern = var = null;
valueSpecified = false;
timeZone = null;
scope = PageContext.PAGE_SCOPE;
parseLocale = null;
}
//*********************************************************************
// 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
public int doEndTag() throws JspException {
String input = null;
// determine the input by...
if (valueSpecified) {
// ... reading 'value' attribute
input = value;
} else {
// ... retrieving and trimming our body
if (bodyContent != null && bodyContent.getString() != null)
input = bodyContent.getString().trim();
}
if ((input == null) || input.equals("")) {
if (var != null) {
pageContext.removeAttribute(var, scope);
}
return EVAL_PAGE;
}
/*
* Set up parsing locale: Use locale specified via the 'parseLocale'
* attribute (if present), or else determine page's locale.
*/
Locale locale = parseLocale;
if (locale == null)
locale = SetLocaleSupport.getFormattingLocale(pageContext,
this,
true,
false);
if (locale == null) {
throw new JspException(
Resources.getMessage("PARSE_DATE_NO_PARSE_LOCALE"));
}
// Create parser
DateFormat parser = createParser(locale);
// Apply pattern, if present
if (pattern != null) {
try {
((SimpleDateFormat) parser).applyPattern(pattern);
} catch (ClassCastException cce) {
parser = new SimpleDateFormat(pattern, locale);
}
}
// 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 JspException(
Resources.getMessage("PARSE_DATE_BAD_TIMEZONE"));
}
} else {
tz = TimeZoneSupport.getTimeZone(pageContext, this);
}
if (tz != null) {
parser.setTimeZone(tz);
}
// Parse date
Date parsed = null;
try {
parsed = parser.parse(input);
} catch (ParseException pe) {
throw new JspException(
Resources.getMessage("PARSE_DATE_PARSE_ERROR", input),
pe);
}
if (var != null) {
pageContext.setAttribute(var, parsed, scope);
} else {
try {
pageContext.getOut().print(parsed);
} 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 createParser(Locale loc) throws JspException {
DateFormat parser = null;
if ((type == null) || DATE.equalsIgnoreCase(type)) {
parser = DateFormat.getDateInstance(
Util.getStyle(dateStyle, "PARSE_DATE_INVALID_DATE_STYLE"),
loc);
} else if (TIME.equalsIgnoreCase(type)) {
parser = DateFormat.getTimeInstance(
Util.getStyle(timeStyle, "PARSE_DATE_INVALID_TIME_STYLE"),
loc);
} else if (DATETIME.equalsIgnoreCase(type)) {
parser = DateFormat.getDateTimeInstance(
Util.getStyle(dateStyle, "PARSE_DATE_INVALID_DATE_STYLE"),
Util.getStyle(timeStyle, "PARSE_DATE_INVALID_TIME_STYLE"),
loc);
} else {
throw new JspException(
Resources.getMessage("PARSE_DATE_INVALID_TYPE", type));
}
parser.setLenient(false);
return parser;
}
}