Here you can find the source of tryMakeRelative(String rootDir, String path)
public static String tryMakeRelative(String rootDir, String path)
//package com.java2s; /*/*from w ww. j a v a2 s . c o m*/ * Copyright 2014 Google Inc. All rights reserved. * * Licensed 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.nio.file.Path; import java.nio.file.Paths; public class Main { /** Tries to make a path relative to a root directory. Returns the fullpath otherwise. */ public static String tryMakeRelative(String rootDir, String path) { return tryMakeRelative(Paths.get(rootDir), Paths.get(path)); } /** Tries to make a path relative to a root directory. Returns the fullpath otherwise. */ public static String tryMakeRelative(Path rootDir, Path path) { Path absRoot = rootDir.toAbsolutePath().normalize(); Path absPath = path.toAbsolutePath().normalize(); Path relPath = absRoot.relativize(absPath).normalize(); if (relPath.toString().isEmpty()) { return "."; } return (relPath.startsWith("..") ? absPath : relPath).toString(); } }