Java Path Normalize normalize(String path)

Description

Normalize a relative URI path that may have relative values ("/./", "/../", and so on ) it it.

License

Apache License

Parameter

Parameter	Description
path	Relative path to be normalized

Declaration

public static String normalize(String path) 

Method Source Code

//package com.java2s;
/*/* www .  j  av a  2  s  .co  m*/
 * Copyright 1999,2004 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 {
    /**
     * Normalize a relative URI path that may have relative values ("/./", "/../", and so on ) it it. <strong>WARNING</strong> - This method is useful only for normalizing application-generated paths. It does not try to perform security checks for malicious input.
     * 
     * @param path
     *            Relative path to be normalized
     */
    public static String normalize(String path) {

        if (path == null)
            return null;

        // Create a place for the normalized path
        String normalized = path;

        if (normalized.equals("/."))
            return "/";

        // Add a leading "/" if necessary
        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 "/./" 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. normalize(String path)
2. normalize(String path)
3. normalize(String path)
4. normalize(String path)
5. normalize(String path)
6. normalize(String path)
7. normalize(String path, String separator)
8. normalize(String pathname, int len, int off)
9. normalize_color_path(int eff_color_path)