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/*******************************************************************************
* Copyright (c) 2009, 2010 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.runtime;
import java.util.StringTokenizer;
import java.util.regex.Pattern;
/**
* Matches strings against <code>?</code>/<code>*</code> wildcard expressions.
* Multiple expressions can be separated with a vertical bar (|). In this case
* the expression matches if at least one part matches.
*
* @author Marc R. Hoffmann
* @version $qualified.bundle.version$
*/
public class WildcardMatcher {
private final Pattern pattern;
/**
* Creates a new matcher with the given expression.
*
* @param expression
* wildcard expressions
*/
public WildcardMatcher(final String expression) {
final String[] parts = expression.split("\\|");
final StringBuilder regex = new StringBuilder(expression.length() * 2);
boolean next = false;
for (final String part : parts) {
if (next) {
regex.append('|');
}
regex.append('(').append(toRegex(part)).append(')');
next = true;
}
pattern = Pattern.compile(regex.toString());
}
private static CharSequence toRegex(final String expression) {
final StringBuilder regex = new StringBuilder(expression.length() * 2);
final StringTokenizer st = new StringTokenizer(expression, "?*", true);
while (st.hasMoreTokens()) {
final String token = st.nextToken();
if (token.equals("?")) {
regex.append(".?");
} else if (token.equals("*")) {
regex.append(".*");
} else {
regex.append(Pattern.quote(token));
}
}
return regex;
}
/**
* Matches the given string against the expressions of this matcher.
*
* @param s
* string to test
* @return <code>true</code>, if the expression matches
*/
public boolean matches(final String s) {
return pattern.matcher(s).matches();
}
}
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