Java Path Normalize normalizePath(String path)

Description

Return a context-relative path, beginning with a "/", that represents the canonical version of the specified path after ".."

License

Apache License

Parameter

Parameter	Description
path	Path to be normalized

Return

String normalized path

Declaration

public static final String normalizePath(String path) 

Method Source Code

//package com.java2s;
/*//from   w ww  . ja  v  a2s  . c o  m
 * Copyright 2001,2004 The Apache Software Foundation.
 * 
 * Licensed 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.
 */

public class Main {
    /**
     * Return a context-relative path, beginning with a "/", that represents
     * the canonical version of the specified path after ".." and "." elements
     * are resolved out.  If the specified path attempts to go outside the
     * boundaries of the current context (i.e. too many ".." path elements
     * are present), return <code>null</code> instead.
     *
     * @param path Path to be normalized
     * @return String normalized path
     */
    public static final String normalizePath(String path) {
        // Normalize the slashes and add leading slash if necessary
        String normalized = path;
        if (normalized.indexOf('\\') >= 0) {
            normalized = normalized.replace('\\', '/');
        }

        if (!normalized.startsWith("/")) {
            normalized = "/" + normalized;
        }

        // Resolve occurrences of "//" in the normalized path
        while (true) {
            int index = normalized.indexOf("//");
            if (index < 0)
                break;
            normalized = normalized.substring(0, index) + normalized.substring(index + 1);
        }

        // Resolve occurrences of "%20" in the normalized path
        while (true) {
            int index = normalized.indexOf("%20");
            if (index < 0)
                break;
            normalized = normalized.substring(0, index) + " " + normalized.substring(index + 3);
        }

        // Resolve occurrences of "/./" in the normalized path
        while (true) {
            int index = normalized.indexOf("/./");
            if (index < 0)
                break;
            normalized = normalized.substring(0, index) + normalized.substring(index + 2);
        }

        // Resolve occurrences of "/../" in the normalized path
        while (true) {
            int index = normalized.indexOf("/../");
            if (index < 0)
                break;
            if (index == 0)
                return (null); // Trying to go outside our context
            int index2 = normalized.lastIndexOf('/', index - 1);
            normalized = normalized.substring(0, index2) + normalized.substring(index + 3);
        }

        // Return the normalized path that we have completed
        return (normalized);
    }
}

Related

1. normalizePath(String path)
2. normalizePath(String path)
3. normalizePath(String path)
4. normalizePath(String path)
5. normalizePath(String path)
6. normalizePath(String path)
7. normalizePath(String path)
8. normalizePath(String path)
9. normalizePath(String path)