Dear All,
I have written a RegexpFilter, which I would like to contribute if you
find that it is of any use. Below you will find the source snippet. If
you will agree, that I'll commit it.
Cheers,
Krzysztof
/**
* This filter uses regexp to create expressions and allow
* you to do replace on those expressions.
*
* This filter works like the Perl subst function. Given a
* regular expression of "a*b", a String to substituteIn of
* "aaaabfooaaabgarplyaaabwackyb" and the substitution String "-", the
* resulting String returned by process(..) would be
"-foo-garply-wacky-".
*
* <pre><code>
* Filter filter = new RegexpFilter();
* filter.addAttribute("a*b","-");
* String text = "aaaabfooaaabgarplyaaabwackyb";
* String result = filter.process(text);
* System.out.println(result);
* </code></pre>
*
* Produces: -foo-garply-wacky-
*
* @author <a href="mailto:[EMAIL PROTECTED]">K.
Zelazowski</a>
* @version 1.0
*/
public class RegexpFilter extends Hashtable implements Filter {
public RegexpFilter()
{
super(4);
}
/** Returns the name of the filter */
public String getInfo()
{
return "RegexpFilter";
}
/**
* This method actually performs the filtering.
*/
public String process(String to_process)
{
if ( to_process == null || to_process.length() == 0 )
return "";
String substituteIn = to_process;
Enumeration enum = keys();
while (enum.hasMoreElements()) {
RE r = (RE)enum.nextElement();
String substitution = (String)get(r);
substituteIn = r.subst(substituteIn, substitution);
}
return substituteIn;
}
/**
* Add regular expression - substitution pair.
*/
public Filter addAttribute(String expression,Object substitution)
{
try {
RE r = new RE(expression);
put(r, substitution);
}
catch (RESyntaxException e) {
return null;
}
return(this);
}
/**
* Get rid of the specified expression-substitution pair.
*/
public Filter removeAttribute(String expression)
{
try
{
RE r = new RE(expression);
remove(r);
}
catch(Exception e)
{
}
return(this);
}
/**
* Does the filter contains this expression?
*/
public boolean hasAttribute(String expression)
{
try {
RE r = new RE(expression);
return containsKey(r);
}
catch (Exception e) {
}
return false;
}
}
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