Java Path String Blur blurPath(String s)

Description

takes in a path string like a/b/c and blurs only the last component of it

License

Apache License

Declaration

public static String blurPath(String s) 

Method Source Code

//package com.java2s;
/*/* w ww  . j  av a  2s  .  c  o  m*/
 Copyright (C) 2012 The Stanford MobiSocial Laboratory
    
   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.
*/

import java.io.*;

import java.util.*;

public class Main {
    public static boolean BLUR = true;

    /** takes in a path string like a/b/c and blurs only the last component of it
     */
    public static String blurPath(String s) {
        if (!BLUR)
            return s;

        if (s == null || s.length() <= 1)
            return s;

        // compute all path components, blurring the last one
        // s: a/b/xyz
        StringTokenizer st = new StringTokenizer(s, File.separator);
        List<String> components = new ArrayList<String>();
        while (st.hasMoreTokens()) {
            String x = st.nextToken();
            if (st.hasMoreTokens())
                components.add(x); // not last token
            else
                components.add(blur(x)); // last token
        }

        // components {a,b,xyz}
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < components.size(); i++) {
            result.append(components.get(i));
            if (i < components.size() - 1)
                result.append(File.separator);
        }
        // result: a/b/x.z

        return result.toString();
    }

    /** replaces everything but the first and last letter of the input string s by '.'
     * useful for bluring potentially sensitive information that is needed in log files
     * like email folder names
     * e.g. SECRET is returned as S....T
     */
    public static String blur(String s) {
        if (!BLUR)
            return s;

        if (s == null || s.length() <= 1)
            return s;
        char c[] = s.toCharArray();
        for (int i = 1; i < s.length() - 1; i++)
            c[i] = '.';
        return new String(c);
    }
}