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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.UnsupportedEncodingException;
import jakarta.servlet.jsp.JspException;
import jakarta.servlet.jsp.JspTagException;
import jakarta.servlet.jsp.PageContext;
import jakarta.servlet.jsp.tagext.TagSupport;
/**
* Support for tag handlers for <requestEncoding>, the tag for setting
* the request character encoding in JSTL 1.0.
*
* @author Jan Luehe
* @author Pierre Delisle
*/
public abstract class RequestEncodingSupport extends TagSupport {
//*********************************************************************
// Package-scoped constants
static final String REQUEST_CHAR_SET =
"jakarta.servlet.jsp.jstl.fmt.request.charset";
//*********************************************************************
// Private constants
private static final String DEFAULT_ENCODING = "ISO-8859-1";
//*********************************************************************
// Tag attributes
protected String value; // 'value' attribute
//*********************************************************************
// Derived information
protected String charEncoding; // derived from 'value' attribute
//*********************************************************************
// Constructor and initialization
public RequestEncodingSupport() {
super();
init();
}
private void init() {
value = null;
}
//*********************************************************************
// Tag logic
public int doEndTag() throws JspException {
charEncoding = value;
if ((charEncoding == null)
&& (pageContext.getRequest().getCharacterEncoding() == null)) {
// Use charset from session-scoped attribute
charEncoding = (String)
pageContext.getAttribute(REQUEST_CHAR_SET,
PageContext.SESSION_SCOPE);
if (charEncoding == null) {
// Use default encoding
charEncoding = DEFAULT_ENCODING;
}
}
/*
* If char encoding was already set in the request, we don't need to
* set it again.
*/
if (charEncoding != null) {
try {
pageContext.getRequest().setCharacterEncoding(charEncoding);
} catch (UnsupportedEncodingException uee) {
throw new JspTagException(uee.toString(), uee);
}
}
return EVAL_PAGE;
}
// Releases any resources we may have (or inherit)
public void release() {
init();
}
}