/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.mx.util;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import javax.management.ObjectName;
/**
* ObjectName pattern matching Helper.<p>
*
* Contains various routines for matching domains and properties.<p>
*
* Routines based on work done Trevor in the registry.
*
* @author <a href="mailto:Adrian.Brock@HappeningTimes.com">Adrian Brock</a>.
* @author <a href="mailto:trevor@protocool.com">Trevor Squires</a>.
* @version $Revision: 1.1 $
*/
public class ObjectNamePatternHelper
{
// Static --------------------------------------------------------
/**
* Compare an object name against a pattern.
*
* @param test the string to test
* @param pattern the pattern to match
*/
public static boolean patternMatch(ObjectName test, ObjectName pattern)
{
if (pattern.equals("*:*"))
return true;
if (patternMatch(test.getDomain(), pattern.getDomain()))
{
PropertyPattern propertyPattern = new PropertyPattern(pattern);
return propertyPattern.patternMatch(test);
}
return false;
}
/**
* Compare strings where ? and * chars are significant.
*
* @param test the string to test
* @param pattern the pattern to match
*/
public static boolean patternMatch(String test, String pattern)
{
if (pattern.equals("*"))
return true;
return patternMatch(test.toCharArray(), 0, pattern.toCharArray(), 0);
}
/**
* Compare where ? and * chars are significant.<p>
*
* I arrived at this solution after quite a bit of trial and error - it's
* all a bit interwoven. Obviously I'm no good at parsers and there must
* be a clearer or more elegant way to do this. I'm suitably in awe of
* the perl regex hackers now.
*
* @param test the string to test
* @param tpos the start of the test string
* @param pattern the pattern to match
* @param ppos the start of the pattern string
*/
public static boolean patternMatch(char[] test, int tpos, char[] pattern, int ppos)
{
int tlen = test.length;
int plen = pattern.length;
while (ppos < plen)
{
char c = pattern[ppos++];
if ('?' == c)
{
// eat a test character and make sure we're not
// already at the end
if (tpos++ == tlen)
return false;
}
else if ('*' == c)
{
if (ppos == plen) // shortcut - * at the end of the pattern
return true;
// hammer the test chars recursively until we
// get a match or we drop off the end of test
do
{
if (patternMatch(test, tpos, pattern, ppos))
return true;
}
while (++tpos < tlen);
}
else if (tpos == tlen || c != test[tpos++])
return false;
}
// fell through with no falses so make sure all of test was examined
return (tpos == tlen);
}
/**
* Encapsulation of property information
*/
public static class PropertyPattern
{
/**
* Are these properties a pattern?
*/
boolean isPropertyPattern;
/**
* The keys for the properties
*/
Object[] propertyKeys;
/**
* The keys for the properties
*/
Object[] propertyValues;
/**
* The canonical key property string
*/
String canonicalKeyPropertyString;
/**
* Construct a new property pattern
*
* @param pattern the object name that might be a pattern
*/
public PropertyPattern(ObjectName pattern)
{
isPropertyPattern = pattern.isPropertyPattern();
if (isPropertyPattern)
{
Hashtable patternKPList = pattern.getKeyPropertyList();
int length = patternKPList.size();
propertyKeys = new Object[length];
propertyValues = new Object[length];
int i = 0;
for (Iterator iterator = patternKPList.entrySet().iterator(); iterator.hasNext(); i++)
{
Map.Entry entry = (Map.Entry) iterator.next();
propertyKeys[i] = entry.getKey();
propertyValues[i] = entry.getValue();
}
}
else
canonicalKeyPropertyString = pattern.getCanonicalKeyPropertyListString();
}
/**
* Test whether the object name matches the pattern
*
* @param ObjectName the name to test
*/
public boolean patternMatch(ObjectName name)
{
if (isPropertyPattern)
{
// "*" matches everything
if (propertyKeys.length == 0)
return true;
Hashtable kplist = name.getKeyPropertyList();
for (int i = 0; i < propertyKeys.length; i++)
{
if (propertyValues[i].equals(kplist.get(propertyKeys[i])) == false)
return false;
}
return true;
}
else
return canonicalKeyPropertyString.equals(name.getCanonicalKeyPropertyListString());
}
}
}