Matcher.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tomcat.util.file;
import java.util.Set;
/**
* <p>This is a utility class to match file globs.
* The class has been derived from
* org.apache.tools.ant.types.selectors.SelectorUtils.
* </p>
* <p>All methods are static.</p>
*/
public final class Matcher {
/**
* Tests whether or not a given file name matches any file name pattern in
* the given set. The match is performed case-sensitively.
*
* @see #match(String, String, boolean)
*
* @param patternSet The pattern set to match against. Must not be
* <code>null</code>.
* @param fileName The file name to match, as a String. Must not be
* <code>null</code>. It must be just a file name, without
* a path.
*
* @return <code>true</code> if any pattern in the set matches against the
* file name, or <code>false</code> otherwise.
*/
public static boolean matchName(Set<String> patternSet, String fileName) {
char[] fileNameArray = fileName.toCharArray();
for (String pattern: patternSet) {
if (match(pattern, fileNameArray, true)) {
return true;
}
}
return false;
}
/**
* Tests whether or not a string matches against a pattern.
* The pattern may contain two special characters:<br>
* '*' means zero or more characters<br>
* '?' means one and only one character
*
* @param pattern The pattern to match against.
* Must not be <code>null</code>.
* @param str The string which must be matched against the
* pattern. Must not be <code>null</code>.
* @param caseSensitive Whether or not matching should be performed
* case sensitively.
*
*
* @return <code>true</code> if the string matches against the pattern,
* or <code>false</code> otherwise.
*/
public static boolean match(String pattern, String str,
boolean caseSensitive) {
return match(pattern, str.toCharArray(), caseSensitive);
}
/**
* Tests whether or not a string matches against a pattern.
* The pattern may contain two special characters:<br>
* '*' means zero or more characters<br>
* '?' means one and only one character
*
* @param pattern The pattern to match against.
* Must not be <code>null</code>.
* @param strArr The character array which must be matched against the
* pattern. Must not be <code>null</code>.
* @param caseSensitive Whether or not matching should be performed
* case sensitively.
*
*
* @return <code>true</code> if the string matches against the pattern,
* or <code>false</code> otherwise.
*/
private static boolean match(String pattern, char[] strArr,
boolean caseSensitive) {
char[] patArr = pattern.toCharArray();
int patIdxStart = 0;
int patIdxEnd = patArr.length - 1;
int strIdxStart = 0;
int strIdxEnd = strArr.length - 1;
char ch;
boolean containsStar = false;
for (char c : patArr) {
if (c == '*') {
containsStar = true;
break;
}
}
if (!containsStar) {
// No '*'s, so we make a shortcut
if (patIdxEnd != strIdxEnd) {
return false; // Pattern and string do not have the same size
}
for (int i = 0; i <= patIdxEnd; i++) {
ch = patArr[i];
if (ch != '?') {
if (different(caseSensitive, ch, strArr[i])) {
return false; // Character mismatch
}
}
}
return true; // String matches against pattern
}
if (patIdxEnd == 0) {
return true; // Pattern contains only '*', which matches anything
}
// Process characters before first star
while (true) {
ch = patArr[patIdxStart];
if (ch == '*' || strIdxStart > strIdxEnd) {
break;
}
if (ch != '?') {
if (different(caseSensitive, ch, strArr[strIdxStart])) {
return false; // Character mismatch
}
}
patIdxStart++;
strIdxStart++;
}
if (strIdxStart > strIdxEnd) {
// All characters in the string are used. Check if only '*'s are
// left in the pattern. If so, we succeeded. Otherwise failure.
return allStars(patArr, patIdxStart, patIdxEnd);
}
// Process characters after last star
while (true) {
ch = patArr[patIdxEnd];
if (ch == '*' || strIdxStart > strIdxEnd) {
break;
}
if (ch != '?') {
if (different(caseSensitive, ch, strArr[strIdxEnd])) {
return false; // Character mismatch
}
}
patIdxEnd--;
strIdxEnd--;
}
if (strIdxStart > strIdxEnd) {
// All characters in the string are used. Check if only '*'s are
// left in the pattern. If so, we succeeded. Otherwise failure.
return allStars(patArr, patIdxStart, patIdxEnd);
}
// process pattern between stars. padIdxStart and patIdxEnd point
// always to a '*'.
while (patIdxStart != patIdxEnd && strIdxStart <= strIdxEnd) {
int patIdxTmp = -1;
for (int i = patIdxStart + 1; i <= patIdxEnd; i++) {
if (patArr[i] == '*') {
patIdxTmp = i;
break;
}
}
if (patIdxTmp == patIdxStart + 1) {
// Two stars next to each other, skip the first one.
patIdxStart++;
continue;
}
// Find the pattern between padIdxStart & padIdxTmp in str between
// strIdxStart & strIdxEnd
int patLength = (patIdxTmp - patIdxStart - 1);
int strLength = (strIdxEnd - strIdxStart + 1);
int foundIdx = -1;
strLoop:
for (int i = 0; i <= strLength - patLength; i++) {
for (int j = 0; j < patLength; j++) {
ch = patArr[patIdxStart + j + 1];
if (ch != '?') {
if (different(caseSensitive, ch,
strArr[strIdxStart + i + j])) {
continue strLoop;
}
}
}
foundIdx = strIdxStart + i;
break;
}
if (foundIdx == -1) {
return false;
}
patIdxStart = patIdxTmp;
strIdxStart = foundIdx + patLength;
}
// All characters in the string are used. Check if only '*'s are left
// in the pattern. If so, we succeeded. Otherwise failure.
return allStars(patArr, patIdxStart, patIdxEnd);
}
private static boolean allStars(char[] chars, int start, int end) {
for (int i = start; i <= end; ++i) {
if (chars[i] != '*') {
return false;
}
}
return true;
}
private static boolean different(
boolean caseSensitive, char ch, char other) {
return caseSensitive
? ch != other
: Character.toUpperCase(ch) != Character.toUpperCase(other);
}
}