Java Path Normalize normalizeRegex(String pathPattern)

Description

Remove trailing regex path parts

License

Open Source License

Parameter

Parameter	Description
pathPattern	a parameter

Declaration

public static String normalizeRegex(String pathPattern) 

Method Source Code

//package com.java2s;
/*//  w w  w.  ja v  a 2  s .c o  m
 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
*/

public class Main {
    /**
     * Remove trailing regex path parts
     * @param pathPattern
     * @return 
     */
    public static String normalizeRegex(String pathPattern) {
        int[] offsets = offsets(pathPattern);
        int cursor = 0;
        int ch = pathPattern.codePointAt(cursor);
        for (;;) {
            switch (ch) {
            case '*':
            case '+':
            case '?':
            case '{':
            case '$':
            case '.':
            case '^':
            case '(':
            case '[':
            case '|':
            case ')':
            case '\\': // TODO: Should maybe handle escape sequences
                break;
            default:
                if (++cursor >= pathPattern.length()) {
                    return pathPattern;
                }
                ch = pathPattern.codePointAt(cursor);
                continue;
            }
            break;
        }
        for (int i = 0; i < offsets.length; i++) {
            if (cursor < offsets[i]) {
                return pathPattern.substring(0, offsets[i - 1]);
            }
            if (cursor == offsets[i]) {
                return pathPattern.substring(0, offsets[i]);
            }
        }
        pathPattern = pathPattern.substring(0, cursor);
        return pathPattern.substring(0, pathPattern.lastIndexOf("/") + 1);
    }

    public static int[] offsets(String path) {
        int count, index;
        // count names
        count = 0;
        index = 0;
        if (path.isEmpty()) {
            // empty path has one name
            count = 0;
        } else {
            while (index < path.length()) {
                char c = path.charAt(index++);
                if (c != '/') {
                    count++;
                    while (index < path.length() && path.charAt(index) != '/') {
                        index++;
                    }
                }
            }
        }

        // populate offsets
        int[] offsets = new int[count];
        count = 0;
        index = 0;
        while (index < path.length()) {
            char c = path.charAt(index);
            if (c == '/') {
                index++;
            } else {
                offsets[count++] = index++;
                while (index < path.length() && path.charAt(index) != '/') {
                    index++;
                }
            }
        }
        return offsets;
    }
}

Related

1. normalizePathname(String pathname)
2. normalizePathPart(final String path)
3. normalizePaths(String path)
4. normalizePathSeparator(final String path)
5. normalizeRegex(String path)
6. normalizeResourcesPath(final String path)
7. normalizeRootPath(String rootPath)
8. normalizeSlashes(final String path)
9. normalizeSlashes(String path)