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jsync.io is a non-blocking, event-driven networking framework for Java

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/*
 * Copyright (c) 2011-2013 The original author or authors
 * ------------------------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *     The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 *
 *     The Apache License v2.0 is available at
 *     http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */
package io.jsync.utils;

import java.util.Stack;

/**
 * A Static class that provides simple URI Utilities
 *
 * @author Tony Rice
 */
public class URIUtils {

    private URIUtils() {
    }

    /**
     * Removes the dot segments in a path
     *
     * @param path String to remove dot segments
     * @return String with escaped values, null if null string input
     */
    public static String removeDotSegments(String path) {
        Stack output = new Stack();
        String input = new String(path);

        while (!input.isEmpty()) {
            if (input.startsWith("../") || input.startsWith("./")) {
                input = input.substring(input.indexOf("/") + 1);
            } else if (input.startsWith("/..")) {
                input = input.substring(3);
                if (!output.isEmpty()) {
                    output.pop();
                }
            } else if (input.equals("/.")) {
                input = "/";
            } else if (input.startsWith("/.")) {
                input = input.substring(2);
            } else if (input.equals(".") || input.equals("..")) {
                input = "";
            } else {
                int segmentIndex = input.indexOf("/", 1);
                if (segmentIndex == -1) {
                    segmentIndex = input.length();
                }

                String pathSegment = input.substring(0, segmentIndex);
                input = input.substring(segmentIndex);
                if (!pathSegment.isEmpty()) {
                    output.push(pathSegment);
                }
            }
        }

        return StringUtils.join(output);
    }
}