org.apache.camel.util.AntPathMatcher Maven / Gradle / Ivy
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/**
* 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.camel.util;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
/**
* PathMatcher implementation for Ant-style path patterns. Examples are provided below.
*
* Part of this mapping code has been kindly borrowed from Apache Ant
* and Spring Framework.
*
* The mapping matches URLs using the following rules:
*
* - ? matches one character
* - * matches zero or more characters
* - ** matches zero or more 'directories' in a path
*
*
* Some examples:
*
* com/t?st.jsp - matches com/test.jsp but also
* com/tast.jsp or com/txst.jsp
* com/*.jsp - matches all .jsp files in the
* com directory
* com/**/test.jsp - matches all test.jsp
* files underneath the com path
* org/springframework/**/*.jsp - matches all
* .jsp files underneath the org/springframework path
* org/**/servlet/bla.jsp - matches
* org/springframework/servlet/bla.jsp but also
* org/springframework/testing/servlet/bla.jsp and
* org/servlet/bla.jsp
*
*/
public class AntPathMatcher {
/** Default path separator: "/" */
public static final String DEFAULT_PATH_SEPARATOR = "/";
private String pathSeparator = DEFAULT_PATH_SEPARATOR;
/**
* Set the path separator to use for pattern parsing. Default is "/", as in
* Ant.
*/
public void setPathSeparator(String pathSeparator) {
this.pathSeparator = pathSeparator != null ? pathSeparator : DEFAULT_PATH_SEPARATOR;
}
public boolean isPattern(String path) {
return path.indexOf('*') != -1 || path.indexOf('?') != -1;
}
public boolean match(String pattern, String path) {
return match(pattern, path, true);
}
public boolean matchStart(String pattern, String path) {
return matchStart(pattern, path, true);
}
public boolean match(String pattern, String path, boolean isCaseSensitive) {
return doMatch(pattern, path, true, isCaseSensitive);
}
public boolean matchStart(String pattern, String path, boolean isCaseSensitive) {
return doMatch(pattern, path, false, isCaseSensitive);
}
/**
* Actually match the given path against the given
* pattern.
*
* @param pattern the pattern to match against
* @param path the path String to test
* @param fullMatch whether a full pattern match is required (else a pattern
* match as far as the given base path goes is sufficient)
* @param isCaseSensitive Whether or not matching should be performed
* case sensitively.
* @return true if the supplied path matched,
* false if it didn't
*/
protected boolean doMatch(String pattern, String path, boolean fullMatch, boolean isCaseSensitive) {
if (path.startsWith(this.pathSeparator) != pattern.startsWith(this.pathSeparator)) {
return false;
}
String[] pattDirs = tokenizeToStringArray(pattern, this.pathSeparator);
String[] pathDirs = tokenizeToStringArray(path, this.pathSeparator);
int pattIdxStart = 0;
int pattIdxEnd = pattDirs.length - 1;
int pathIdxStart = 0;
int pathIdxEnd = pathDirs.length - 1;
// Match all elements up to the first **
while (pattIdxStart <= pattIdxEnd && pathIdxStart <= pathIdxEnd) {
String patDir = pattDirs[pattIdxStart];
if ("**".equals(patDir)) {
break;
}
if (!matchStrings(patDir, pathDirs[pathIdxStart], isCaseSensitive)) {
return false;
}
pattIdxStart++;
pathIdxStart++;
}
if (pathIdxStart > pathIdxEnd) {
// Path is exhausted, only match if rest of pattern is * or **'s
if (pattIdxStart > pattIdxEnd) {
return pattern.endsWith(this.pathSeparator) ? path.endsWith(this.pathSeparator) : !path
.endsWith(this.pathSeparator);
}
if (!fullMatch) {
return true;
}
if (pattIdxStart == pattIdxEnd && pattDirs[pattIdxStart].equals("*")
&& path.endsWith(this.pathSeparator)) {
return true;
}
for (int i = pattIdxStart; i <= pattIdxEnd; i++) {
if (!pattDirs[i].equals("**")) {
return false;
}
}
return true;
} else if (pattIdxStart > pattIdxEnd) {
// String not exhausted, but pattern is. Failure.
return false;
} else if (!fullMatch && "**".equals(pattDirs[pattIdxStart])) {
// Path start definitely matches due to "**" part in pattern.
return true;
}
// up to last '**'
while (pattIdxStart <= pattIdxEnd && pathIdxStart <= pathIdxEnd) {
String patDir = pattDirs[pattIdxEnd];
if (patDir.equals("**")) {
break;
}
if (!matchStrings(patDir, pathDirs[pathIdxEnd], isCaseSensitive)) {
return false;
}
pattIdxEnd--;
pathIdxEnd--;
}
if (pathIdxStart > pathIdxEnd) {
// String is exhausted
for (int i = pattIdxStart; i <= pattIdxEnd; i++) {
if (!pattDirs[i].equals("**")) {
return false;
}
}
return true;
}
while (pattIdxStart != pattIdxEnd && pathIdxStart <= pathIdxEnd) {
int patIdxTmp = -1;
for (int i = pattIdxStart + 1; i <= pattIdxEnd; i++) {
if (pattDirs[i].equals("**")) {
patIdxTmp = i;
break;
}
}
if (patIdxTmp == pattIdxStart + 1) {
// '**/**' situation, so skip one
pattIdxStart++;
continue;
}
// Find the pattern between padIdxStart & padIdxTmp in str between
// strIdxStart & strIdxEnd
int patLength = patIdxTmp - pattIdxStart - 1;
int strLength = pathIdxEnd - pathIdxStart + 1;
int foundIdx = -1;
strLoop:
for (int i = 0; i <= strLength - patLength; i++) {
for (int j = 0; j < patLength; j++) {
String subPat = pattDirs[pattIdxStart + j + 1];
String subStr = pathDirs[pathIdxStart + i + j];
if (!matchStrings(subPat, subStr, isCaseSensitive)) {
continue strLoop;
}
}
foundIdx = pathIdxStart + i;
break;
}
if (foundIdx == -1) {
return false;
}
pattIdxStart = patIdxTmp;
pathIdxStart = foundIdx + patLength;
}
for (int i = pattIdxStart; i <= pattIdxEnd; i++) {
if (!pattDirs[i].equals("**")) {
return false;
}
}
return true;
}
/**
* Tests whether or not a string matches against a pattern. The pattern may
* contain two special characters:
* '*' means zero or more characters
* '?' means one and only one character
*
* @param pattern pattern to match against. Must not be null.
* @param str string which must be matched against the pattern. Must not be
* null.
* @param caseSensitive Whether or not matching should be performed
* case sensitively.
* @return true if the string matches against the pattern, or
* false otherwise.
*/
private boolean matchStrings(String pattern, String str, boolean caseSensitive) {
char[] patArr = pattern.toCharArray();
char[] strArr = str.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 ((ch = patArr[patIdxStart]) != '*' && strIdxStart <= strIdxEnd) {
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.
for (int i = patIdxStart; i <= patIdxEnd; i++) {
if (patArr[i] != '*') {
return false;
}
}
return true;
}
// Process characters after last star
while ((ch = patArr[patIdxEnd]) != '*' && strIdxStart <= strIdxEnd) {
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.
for (int i = patIdxStart; i <= patIdxEnd; i++) {
if (patArr[i] != '*') {
return false;
}
}
return true;
}
// 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.
for (int i = patIdxStart; i <= patIdxEnd; i++) {
if (patArr[i] != '*') {
return false;
}
}
return true;
}
/**
* Given a pattern and a full path, determine the pattern-mapped part.
*
* For example:
*
* - '
/docs/cvs/commit.html' and '
* /docs/cvs/commit.html -> ''
* - '
/docs/*' and '/docs/cvs/commit -> '
* cvs/commit'
* - '
/docs/cvs/*.html' and '
* /docs/cvs/commit.html -> 'commit.html'
* - '
/docs/**' and '/docs/cvs/commit -> '
* cvs/commit'
* - '
/docs/**\/*.html' and '
* /docs/cvs/commit.html -> 'cvs/commit.html'
* - '
/*.html' and '/docs/cvs/commit.html -> '
* docs/cvs/commit.html'
* - '
*.html' and '/docs/cvs/commit.html -> '
* /docs/cvs/commit.html'
* - '
*' and '/docs/cvs/commit.html -> '
* /docs/cvs/commit.html'
*
*
* Assumes that {@link #match} returns true for '
* pattern' and 'path', but does
* not enforce this.
*/
public String extractPathWithinPattern(String pattern, String path) {
String[] patternParts = tokenizeToStringArray(pattern, this.pathSeparator);
String[] pathParts = tokenizeToStringArray(path, this.pathSeparator);
StringBuilder buffer = new StringBuilder();
// Add any path parts that have a wildcarded pattern part.
int puts = 0;
for (int i = 0; i < patternParts.length; i++) {
String patternPart = patternParts[i];
if ((patternPart.indexOf('*') > -1 || patternPart.indexOf('?') > -1) && pathParts.length >= i + 1) {
if (puts > 0 || (i == 0 && !pattern.startsWith(this.pathSeparator))) {
buffer.append(this.pathSeparator);
}
buffer.append(pathParts[i]);
puts++;
}
}
// Append any trailing path parts.
for (int i = patternParts.length; i < pathParts.length; i++) {
if (puts > 0 || i > 0) {
buffer.append(this.pathSeparator);
}
buffer.append(pathParts[i]);
}
return buffer.toString();
}
/**
* Tokenize the given String into a String array via a StringTokenizer.
* Trims tokens and omits empty tokens.
*
* The given delimiters string is supposed to consist of any number of
* delimiter characters. Each of those characters can be used to separate
* tokens. A delimiter is always a single character; for multi-character
* delimiters, consider using delimitedListToStringArray
*
* @param str the String to tokenize
* @param delimiters the delimiter characters, assembled as String (each of
* those characters is individually considered as delimiter).
* @return an array of the tokens
* @see java.util.StringTokenizer
* @see java.lang.String#trim()
*/
public static String[] tokenizeToStringArray(String str, String delimiters) {
if (str == null) {
return null;
}
StringTokenizer st = new StringTokenizer(str, delimiters);
List tokens = new ArrayList();
while (st.hasMoreTokens()) {
String token = st.nextToken();
token = token.trim();
if (token.length() > 0) {
tokens.add(token);
}
}
return tokens.toArray(new String[tokens.size()]);
}
private static boolean different(boolean caseSensitive, char ch, char other) {
return caseSensitive ? ch != other : Character.toUpperCase(ch) != Character.toUpperCase(other);
}
}