Java Relative Path Get relativePath(File path, File relativeTo)

Description

Calculates the relative path of one path relative to another

License

Apache License

Parameter

Parameter	Description
path	The target path
relativeTo	The path that the target path should be relative to

Return

A path that is pointing to the target path but is relative to the relativeTo path

Declaration

public static File relativePath(File path, File relativeTo) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;

public class Main {
    /**// w w w.ja v a2  s  .c o  m
     * Calculates the relative path of one path relative to another
     * 
     * @param path The target path
     * @param relativeTo The path that the target path should be
     *            relative to
     * @return A path that is pointing to the target path but is
     *         relative to the relativeTo path
     */
    public static File relativePath(File path, File relativeTo) {
        File tmpPath = path;
        File tmpRelativeTo = relativeTo;

        if (tmpRelativeTo != null) {
            String t1 = getFirstPart(tmpPath);
            String t2 = getFirstPart(tmpRelativeTo);
            while (t2.equals(t1)) {
                tmpPath = getTail(tmpPath);
                tmpRelativeTo = getTail(tmpRelativeTo);
                t1 = getFirstPart(tmpPath);
                t2 = getFirstPart(tmpRelativeTo);
            }
        }
        while (tmpRelativeTo != null) {
            tmpPath = new File("..", tmpPath.getPath());
            tmpRelativeTo = tmpRelativeTo.getParentFile();
        }

        return tmpPath;
    }

    /**
     * Get the first part of a file path, which is the root directory
     * or the file name if the path contains no directory
     * 
     * @param path
     * @return The first part of a file path
     */
    public static String getFirstPart(File path) {
        String first = "";
        File tmp = path;
        while (tmp != null) {
            first = tmp.getName();
            tmp = tmp.getParentFile();
        }
        return first;
    }

    /**
     * Get everything but the first part of a file path
     * 
     * @param path
     * @return Everything but the first part of the file path
     */
    public static File getTail(File path) {
        if (path.getParentFile() == null) {
            return null;
        } else {
            String first = getFirstPart(path);
            return new File(path.getPath().substring(first.length() + 1));
        }
    }
}

Related

1. relativePath(File from, File to)
2. relativePath(File home, File f)
3. relativePath(File IncludedFile, File UpperDirectory)
4. relativePath(File parent, File child)
5. relativePath(File parent, File child)
6. relativePath(File root, File node)
7. relativePath(File src, File dest)
8. relativePath(final File root, final File file)
9. relativePath(final String inputPath, final File file)