PathUtils.java :  » Web-Framework » anvil » anvil » util » Java Open Source

/*
 * $Id: PathUtils.java,v 1.4 2002/09/16 08:05:07 jkl Exp $
 *
 * Copyright (c) 2002 Njet Communications Ltd. All Rights Reserved.
 *
 * Use is subject to license terms, as defined in
 * Anvil Sofware License, Version 1.1. See LICENSE 
 * file, or http://njet.org/license-1.1.txt
 */
package anvil.util;

import java.util.StringTokenizer;

/**
 * PathUtils
 *
 * @author: Jani Lehtimki 
 */
public class PathUtils
{

  public static final String mergePaths(String path1, String path2)
  {
    int length = path2.length();
    if ((length > 2) && (path2.charAt(1) == ':')) {
      path2 = path2.substring(2);
    }
    if (path2.startsWith("/")) {
      return normalizePath(path2);
    } else {
      if (path1.endsWith("/")) {
        return normalizePath(path1 + path2);
      } else {
        int i = path1.lastIndexOf('/');
        if (i>=0) {
          return normalizePath(path1.substring(0, i+1) + path2);
        } else {
          return normalizePath(path1 + path2);
        }
      }
      
    }
  }

  public static final String normalizePath(String path)
  {
    boolean endslash = path.endsWith("/");
    StringTokenizer tokenizer = new StringTokenizer(path, "/");
    int n = tokenizer.countTokens();
    String[] parts = new String[n];
    int max = 0;
    while(tokenizer.hasMoreTokens()) {
      String part = tokenizer.nextToken();
      if (part.equals("..")) {
        if (max > 0) {
          max --;
        }
      } else if (part.equals(".")) {
        //skip
      } else { 
        parts[max++] = part;
      }
    }
    StringBuffer buffer = new StringBuffer(path.length());
    for(int i=0; i<max; i++) {
      buffer.append('/');
      buffer.append(parts[i]);
    }
    if (endslash) {
      buffer.append('/');
    }
    return buffer.toString();
  }
  
}