Java Path Exist nio getNonExisting(Path path)

Description

get Non Existing

License

Open Source License

Declaration

private static Path getNonExisting(Path path) 

Method Source Code

//package com.java2s;
/*-//  www .j  a  va  2 s . c o m
 * ============================LICENSE_START============================
 * data.messie (core)
 * =====================================================================
 * Copyright (C) 2013 - 2017 Dr. Raphael Romeikat
 * =====================================================================
 * This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public
License along with this program.  If not, see
<http://www.gnu.org/licenses/gpl-3.0.html>.
 * =============================LICENSE_END=============================
 */

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Main {
    private static Path getNonExisting(Path path) {
        // Return path, if it does not exist
        if (!Files.exists(path)) {
            return path;
        }
        // Determine name and extension
        final String name = path.getFileName().toString();
        final int fileTypeIndex = name.lastIndexOf(".");
        String nameWithoutExtension;
        String extension;
        if (fileTypeIndex == -1) {
            nameWithoutExtension = name;
            extension = "";
        } else {
            nameWithoutExtension = name.substring(0, fileTypeIndex);
            extension = name.substring(fileTypeIndex);
        }
        // Determine number
        final int underscoreIndex = name.lastIndexOf("_");
        String nameWithoutExtensionWithoutNumber;
        Integer nextNumber = 1;
        if (underscoreIndex == -1) {
            nameWithoutExtensionWithoutNumber = nameWithoutExtension;
        } else {
            nameWithoutExtensionWithoutNumber = nameWithoutExtension.substring(0, underscoreIndex);
            final String numberString = name.substring(underscoreIndex + 1);
            try {
                nextNumber = Integer.parseInt(numberString) + 1;
            } catch (final NumberFormatException e) {
            }
        }
        // Determine next candidate
        String nextName;
        while (true) {
            nextName = nameWithoutExtensionWithoutNumber + "_" + nextNumber++ + extension;
            path = Paths.get(path.getParent().toString(), nextName);
            if (!Files.exists(path)) {
                return path;
            }
        }
    }
}

Related

1. exists(Path value)
2. exists(Path... files)
3. exists(String path)
4. existsAndIsDirectory(Path path)
5. fileExists(Path path)
6. isExists(final Path path)
7. isFileExists(Path file)
8. lenientExists(Path file)
9. makeTempFilePath(boolean exists)