Java Path Relative nio getRelativePath(Path file, Path baseDir)

Description

get Relative Path

License

Open Source License

Declaration

public static String getRelativePath(Path file, Path baseDir) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.nio.file.Path;

public class Main {
    public final static char SLASH_CHAR = '/';
    public final static char BACK_SLASH_CHAR = '\\';

    public static String getRelativePath(Path file, Path baseDir) {
        return getRelativePath(file != null ? file.toString() : null, baseDir != null ? baseDir.toString() : null);
    }//from   ww  w  . j  a  v a2  s  .com

    public static final String getRelativePath(String path, String baseDirPath) {
        return getRelativePath(path, baseDirPath, SLASH_CHAR);
    }

    public static final String getRelativePath(String path, String baseDirPath, char separator) {
        if (path == null) {
            return path;
        }
        String p = normalise(path, separator);
        if (baseDirPath == null) {
            return p;
        }
        String base = normalise(baseDirPath, separator);
        base = trimTrailingSeparator(base, separator);
        if (p.equals(base) || base.length() >= p.length()) {
            return p;
        }
        if (p.startsWith(base)) {
            String relativePath = p.substring(base.length());
            relativePath = trimLeadingSeparator(relativePath, separator);
            return relativePath;
        }
        return p;
    }

    public static final String normalise(String path) {
        return normalise(path, BACK_SLASH_CHAR, SLASH_CHAR);
    }

    public static final String normalise(String path, char separator) {
        return normalise(path, separator, separator);
    }

    public static final String normalise(String path, char separator, char newSeparator) {
        if (path != null) {
            String p = path.trim();
            if (separator != newSeparator) {
                p = p.replace(separator, newSeparator);
            }
            p.replaceAll("\\" + newSeparator + "{2,}", "\\" + newSeparator);
            return p;
        }
        return null;
    }

    public static final String trimTrailingSeparator(String path, char separator) {
        if (path != null) {
            String p = normalise(path, separator);
            if (p.length() > 1) {
                return p.replaceAll("\\" + separator + "+$", "");
            } else {
                return p;
            }
        }
        return null;
    }

    public static boolean equals(String a, String b) {
        String sa = b == null ? null : normalise(b);
        String sb = a == null ? null : normalise(a);
        if (sa != null && sb != null) {
            return sa.equals(sb);
        } else if (sa == null && sb == null) {
            return true;
        }
        return false;
    }

    public static final String trimLeadingSeparator(String path, char separator) {
        if (path != null) {
            String p = normalise(path, separator);
            if (p.length() > 1) {
                return p.replaceAll("^\\" + separator + "+", "");
            } else {
                return p;
            }
        }
        return null;
    }
}

Related

1. getRelativeFilePathToCwd(File file)
2. getRelativePath(File baseFile, File file, String resultIfImpossible)
3. getRelativePath(File basePath, File path)
4. getRelativePath(File root, File f)
5. getRelativePath(final File file, final File baseDir)
6. getRelativePath(Path rootPath, Path path)
7. getRelativePath(String file, String directory)
8. getRelativePath(String fullPath, String homeFolderPath)
9. getRelativePath(String relativePathFile)