normalize Path - Java File Path IO

Java examples for File Path IO:Path

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Description

normalize Path

Demo Code

/*//from   ww w  .j av a2s.  c o  m
 * Copyright (c) 2007 Adobe Systems Incorporated
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy of
 *  this software and associated documentation files (the "Software"), to deal in
 *  the Software without restriction, including without limitation the rights to
 *  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 *  the Software, and to permit persons to whom the Software is furnished to do so,
 *  subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all
 *  copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 *  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 *  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 *  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 *  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
//package com.java2s;

import java.util.Stack;
import java.util.StringTokenizer;

public class Main {
    public static String normalizePath(String path)
            throws IllegalArgumentException {
        // Test for any ../ or ./
        if (path.indexOf("./") < 0)
            return path;
        Stack<String> pathSegments = new Stack<String>();
        StringTokenizer tokenizer = new StringTokenizer(path, "/");
        while (tokenizer.hasMoreTokens()) {
            String pathSegment = tokenizer.nextToken();
            if (".".equals(pathSegment))
                continue;
            if ("..".equals(pathSegment)) {
                if (pathSegments.size() == 0) {
                    throw new IllegalArgumentException("Invalid path: "
                            + path);
                }
                pathSegments.pop();
            } else {
                pathSegments.push(pathSegment);
            }
        }
        StringBuffer sb = new StringBuffer(path.length());
        int len = pathSegments.size();
        for (int i = 0; i < len; i++) {
            if (i != 0)
                sb.append('/');
            sb.append(pathSegments.elementAt(i));
        }
        return sb.toString();
    }
}

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