Merges the two paths to create a valid version of the second path : Path « File Input Output « Java

Merges the two paths to create a valid version of the second path

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 * to you 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
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 * under the License.


 * FileUtils is a collection of routines for common file system operations.
 * @author Dan Jemiolo (danj)

public final class FileUtils {

   * Merges the two paths to create a valid version of the second path. This
   * method should be used when you encounter a relative path in a document and
   * must resolve it based on the path of the current document. An example would
   * be: <br>
   * <br>
   * <b>original path</b> - files/customers/Orders.xml <br>
   * <br>
   * <b>relative path</b> - ../Accounts.xml <br>
   * <br>
   * <b>result</b> - files/customers/Accounts.xml <br>
   * <br>
   * The only time this method cannot be used is if the original path is for a
   * file that is in the root (has no directory as part of its path) and the
   * relative path starts with "..".
   * @param originalPath
   *          The path of the file that references another file.
   * @param relativePath
   *          The path of the other file, which is relative to the original.
   * @return A proper path for the other file, one that can be used to open and
   *         verify the file.
  public static String createRelativePath(String originalPath, String relativePath) {
    if (originalPath == null)
      throw new NullPointerException("NullOriginalPath");

    if (relativePath == null)
      throw new NullPointerException("NullRelativePath");

    // remove ./ if present
    if (relativePath.startsWith("./"))
      relativePath = relativePath.substring(2);

    // remove any .. reference by taking off the last section/ of
    // the original path
    if (relativePath.startsWith("../")) {
      int slash = originalPath.lastIndexOf('/');
      originalPath = originalPath.substring(0, slash);
      relativePath = relativePath.substring(3);

    int slash = originalPath.lastIndexOf('/');

    if (slash < 0)
      return relativePath;

    String dir = originalPath.substring(0, slash + 1);
    return dir + relativePath;



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