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Posted to taglibs-dev@jakarta.apache.org by ca...@apache.org on 2001/05/21 22:56:02 UTC
cvs commit: jakarta-taglibs/random/src/org/apache/taglibs/random RandomNumTag.java
catlett 01/05/21 13:56:02
Added: random/src/org/apache/taglibs/random RandomNumTag.java
Log:
first import of random taglib
Revision Changes Path
1.1 jakarta-taglibs/random/src/org/apache/taglibs/random/RandomNumTag.java
Index: RandomNumTag.java
===================================================================
/*
* $Header: /home/cvs/jakarta-taglibs/random/src/org/apache/taglibs/random/RandomNumTag.java,v 1.1 2001/05/21 20:56:01 catlett Exp $
* $Revision: 1.1 $
* $Date: 2001/05/21 20:56:01 $
*
* ====================================================================
*
* 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.random;
import java.util.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import org.apache.taglibs.random.RandomNum;
/**
* The RandomNumTag will set up a random number generator which can be accessed by
* the <b>jsp:getProperty</b> tag.
*
* <tag>
* <name>randomnum</name>
* <tagclass>org.apache.taglibs.random.RandomNumTag</tagclass>
* <bodycontent>empty</bodycontent>
* <info>Creates a variable length random number generator</info>
*
* <attribute>
* <name>id</name>
* <required>true</required>
* <rtexprvalue>false</rtexprvalue>
* </attribute>
* <attribute>
* <name>range</name>
* <required>false</required>
* <rtexprvalue>false</rtexprvalue>
* </attribute>
* </tag>
*
* @author Rich Catlett
*
* @version 1.0
*
*/
public class RandomNumTag extends TagSupport {
/**
* upper bound in which to search for a number defaults to 9
*/
private long upper = 100;
/**
* lower bound in which to search for a number defaults to 0
*/
private long lower = 0;
/**
* implementation of method from the Tag interface that tells the JSP what
* to do upon encountering the start tag for this tag set
*
* @return SKIP_BODY - integer value telling the JSP engine to not evaluate
* the body of this tag
*
* @throw JspException thrown when error occurs in processing the body of
* this method
*
*/
public final int doStartTag() throws JspException {
RandomNum random = new RandomNum();
// set the range in the randomnum class
random.setRange(lower, upper);
// place random into page scope so that it will be available as a
// script variable
pageContext.setAttribute(id, random, PageContext.PAGE_SCOPE);
return SKIP_BODY;
}
/**
* set the Range
*
* @param value String value that determines range from which the random
* number will be chosen
*
* @throws JspException if the lowerbound is greater than the upperbound
*
*/
public final void setRange(String value) throws JspException {
try {
upper = new Integer(value.substring(value.indexOf('-') + 1)).longValue();
} catch (NumberFormatException nfe) {
pageContext.getServletContext().log("upper attribute could not be" +
" turned into an Integer default value was used");
}
try {
lower = new Integer(value.substring(0, value.indexOf('-'))).longValue();
} catch (NumberFormatException nfe) {
pageContext.getServletContext().log("lower attribute could not be" +
" turned into an Integer default value was used");
}
// check that the range is possible i.e. the upperbound is not lower than
// the lowerbound
if (upper < lower)
throw new JspException("You can't have a range where the lowerbound" +
" is higher than the upperbound.");
}
}