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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.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
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 <parseNumber>, the number parsing tag
* in JSTL 1.0.
*
* @author Jan Luehe
*/
public abstract class ParseNumberSupport extends BodyTagSupport {
//*********************************************************************
// Private constants
private static final String NUMBER = "number";
private static final String CURRENCY = "currency";
private static final String PERCENT = "percent";
//*********************************************************************
// Protected state
protected String value; // 'value' attribute
protected boolean valueSpecified; // status
protected String type; // 'type' attribute
protected String pattern; // 'pattern' attribute
protected Locale parseLocale; // 'parseLocale' attribute
protected boolean isIntegerOnly; // 'integerOnly' attribute
protected boolean integerOnlySpecified;
//*********************************************************************
// Private state
private String var; // 'var' attribute
private int scope; // 'scope' attribute
//*********************************************************************
// Constructor and initialization
public ParseNumberSupport() {
super();
init();
}
private void init() {
value = type = pattern = var = null;
valueSpecified = false;
parseLocale = null;
integerOnlySpecified = false;
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
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 loc = parseLocale;
if (loc == null)
loc = SetLocaleSupport.getFormattingLocale(pageContext,
this,
false,
false);
if (loc == null) {
throw new JspException(
Resources.getMessage("PARSE_NUMBER_NO_PARSE_LOCALE"));
}
// Create parser
NumberFormat parser = null;
if ((pattern != null) && !pattern.equals("")) {
// if 'pattern' is specified, 'type' is ignored
DecimalFormatSymbols symbols = new DecimalFormatSymbols(loc);
parser = new DecimalFormat(pattern, symbols);
} else {
parser = createParser(loc);
}
// Configure parser
if (integerOnlySpecified)
parser.setParseIntegerOnly(isIntegerOnly);
// Parse number
Number parsed = null;
try {
parsed = parser.parse(input);
} catch (ParseException pe) {
throw new JspException(
Resources.getMessage("PARSE_NUMBER_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 NumberFormat createParser(Locale loc) throws JspException {
NumberFormat parser = null;
if ((type == null) || NUMBER.equalsIgnoreCase(type)) {
parser = NumberFormat.getNumberInstance(loc);
} else if (CURRENCY.equalsIgnoreCase(type)) {
parser = NumberFormat.getCurrencyInstance(loc);
} else if (PERCENT.equalsIgnoreCase(type)) {
parser = NumberFormat.getPercentInstance(loc);
} else {
throw new JspException(
Resources.getMessage("PARSE_NUMBER_INVALID_TYPE",
type));
}
return parser;
}
}