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Posted to taglibs-dev@jakarta.apache.org by gl...@locus.apache.org on 2000/09/24 02:01:54 UTC
cvs commit: jakarta-taglibs/request/src/org/apache/taglibs/request ExistsParameterTag.java
glenn 00/09/23 17:01:54
Added: request/src/org/apache/taglibs/request
ExistsParameterTag.java
Log:
existsparameter tag
Revision Changes Path
1.1 jakarta-taglibs/request/src/org/apache/taglibs/request/ExistsParameterTag.java
Index: ExistsParameterTag.java
===================================================================
/*
* $Header: /home/cvs/jakarta-taglibs/request/src/org/apache/taglibs/request/ExistsParameterTag.java,v 1.1 2000/09/24 00:01:54 glenn Exp $
* $Revision: 1.1 $
* $Date: 2000/09/24 00:01:54 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.taglibs.request;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
/**
* JSP Tag <b>existsparameter</b>, used to determine if an HttpServletRequest
* parameter exists.
* <p>
* Includes the body of the tag if the parameter exists.
* <p>
* You can set the optional tag parameter <b>value</b> to <i>true</i> or
* <i>false</i>. The body of the tag is included if existsparameter matches
* the value.
* <p>
* JSP Tag Lib Descriptor
* <p><pre>
* <name>existsparameter</name>
* <tagclass>org.apache.taglibs.request.ExistsParameterTag</tagclass>
* <bodycontent>JSP</bodycontent>
* <info>Includes the body of the tag if the request parameter exists.</info>
* <attribute>
* <name>name</name>
* <required>true</required>
* <rtexprvalue>false</rtexprvalue>
* </attribute>
* <attribute>
* <name>value</name>
* <required>false</required>
* <rtexprvalue>false</rtexprvalue>
* </attribute>
* </pre>
*
* @author Glenn Nielsen
*/
public class ExistsParameterTag extends TagSupport
{
private String name = null;
private Boolean value = null;
/**
* Includes the body of the tag if the request parameter exists.
*
* @return SKIP_BODY if existsparameter doesn't match value, EVAL_BODY_include if existsparameter matches value
*/
public int doStartTag() throws JspException
{
boolean result = false;
if( ((HttpServletRequest)pageContext.getRequest()).getParameter(name) != null )
result = true;
if( value == null ) {
if( result )
return EVAL_BODY_INCLUDE;
return SKIP_BODY;
}
if( value.booleanValue() == result )
return EVAL_BODY_INCLUDE;
return SKIP_BODY;
}
public void setName(String str)
{
name = str;
}
public void setValue(String str)
{
value = new Boolean(str);
}
}