// $Id: PredicateStringMatch.java 41 2010-04-03 20:04:12Z marcusvnac $
// Copyright (c) 1996-2008 The Regents of the University of California. All
// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies. This software program and
// documentation are copyrighted by The Regents of the University of
// California. The software program and documentation are supplied "AS
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// does not warrant that the operation of the program will be
// uninterrupted or error-free. The end-user understands that the program
// was developed for research purposes and is advised not to rely
// exclusively on the program for any reason. IN NO EVENT SHALL THE
// UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY
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package org.argouml.util;
import java.util.StringTokenizer;
/**
* Predicate to match strings/substrings. It only supports simple
* wildcard processing, not full regex style matching.
*/
public class PredicateStringMatch implements Predicate {
public static int MAX_PATS = 10;
private String patterns[];
private int patternCount;
protected PredicateStringMatch(String matchPatterns[], int count) {
patterns = matchPatterns;
patternCount = count;
}
public static Predicate create(String pattern) {
pattern = pattern.trim();
if ("*".equals(pattern) || "".equals(pattern)) {
return PredicateTrue.getInstance();
}
String pats[] = new String[MAX_PATS];
int count = 0;
if (pattern.startsWith("*")) {
pats[count++] = "";
}
StringTokenizer st = new StringTokenizer(pattern, "*");
while (st.hasMoreElements()) {
String token = st.nextToken();
pats[count++] = token;
}
if (pattern.endsWith("*")) {
pats[count++] = "";
}
if (count == 0) {
return PredicateTrue.getInstance();
}
if (count == 1) {
return new PredicateEquals(pats[0]);
}
return new PredicateStringMatch(pats, count);
}
public boolean evaluate(Object o) {
if (o == null) {
return false;
}
String target = o.toString();
if (!target.startsWith(patterns[0])) {
return false;
}
if (!target.endsWith(patterns[patternCount - 1])) {
return false;
}
for (String pattern : patterns) {
int index = (target + "*").indexOf(pattern);
if (index == -1) {
return false;
}
target = target.substring(index + pattern.length());
}
return true;
}
}