Java Path Relative Get getRelativePath(File fromFile, File toFile)

Description

get Relative Path

License

Apache License

Declaration

public static String getRelativePath(File fromFile, File toFile) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2017 Veronica Anokhina.//from   w  ww.ja v a  2 s .c  om
 *
 * 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.io.File;
import java.util.ArrayList;

public class Main {
    public static String getRelativePath(File fromFile, File toFile) {
        if (toFile != null) {
            ArrayList<File> lst = getParents(fromFile, null);
            if (fromFile.isDirectory()) {
                lst.add(fromFile);
            }
            File rootFile = getRoot(toFile, lst);
            if (rootFile != null) {
                String ret = toRoot(rootFile, fromFile)
                        + toFile.getAbsolutePath().replace(rootFile.getAbsolutePath(), "").replace("\\", "/");
                if (ret.startsWith("./")) {
                    ret = ret.substring("./".length());
                }
                //System.err.println("---------href----"+fromFile+":"+toFile+":"+ret);
                return ret;
            }
        }
        return null;
    }

    private static ArrayList<File> getParents(File f, ArrayList<File> lst) {
        if (lst == null) {
            lst = new ArrayList<>();
        }
        File pf = f.getParentFile();
        if (pf != null) {
            getParents(pf, lst);
            lst.add(pf);
        }
        return lst;
    }

    private static File getRoot(File file, ArrayList<File> lst) {
        if (file != null && lst != null && lst.size() > 0) {
            for (File f : lst) {
                if (file.equals(f)) {
                    return f;
                }
            }
            return getRoot(file.getParentFile(), lst);
        }
        return null;
    }

    private static String toRoot(File root, File file) {
        if (file != null && !file.isDirectory()) {
            file = file.getParentFile();
        }
        if (file == null || file.equals(root)) {
            return ".";
        }
        String ret = toRoot(root, file.getParentFile());
        if (ret.equals(".")) {
            return "..";
        } else {
            return "../" + ret;
        }
    }
}

Related

1. getRelativePath(File file, String xmlDirectoryPath)
2. getRelativePath(File fileOrFolder, File baseFolder)
3. getRelativePath(File folderContainingFile, File fileInFolder)
4. getRelativePath(File fromDir, File toFile)
5. getRelativePath(File fromFile, File toFile)
6. getRelativePath(File fromFile, File toFile)
7. getRelativePath(File fromFile, File toFile)
8. getRelativePath(File fromFolder, File toFile)
9. getRelativePath(File home, File f)