Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.io.File;
import java.io.FileFilter;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.util.Collection;
import java.util.LinkedList;

public class Main {
    private static final char SYSTEM_SEPARATOR = File.separatorChar;

    public static void deleteDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            return;
        }

        if (!isSymlink(directory)) {
            cleanDirectory(directory);
        }

        if (!directory.delete()) {
            String message = "Unable to delete directory " + directory + ".";

            throw new IOException(message);
        }
    }

    public static boolean isSymlink(File file) throws IOException {
        if (file == null) {
            throw new NullPointerException("File must not be null");
        }
        if (isSystemWindows()) {
            return false;
        }
        File fileInCanonicalDir = null;
        if (file.getParent() == null) {
            fileInCanonicalDir = file;
        } else {
            File canonicalDir = file.getParentFile().getCanonicalFile();
            fileInCanonicalDir = new File(canonicalDir, file.getName());
        }

        return !fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile());
    }

    public static void cleanDirectory(File directory) throws IOException {
        if (!directory.exists()) {
            String message = directory + " does not exist";
            throw new IllegalArgumentException(message);
        }

        if (!directory.isDirectory()) {
            String message = directory + " is not a directory";
            throw new IllegalArgumentException(message);
        }

        File[] files = directory.listFiles();
        if (files == null) {
            throw new IOException("Failed to list contents of " + directory);
        }

        IOException exception = null;
        for (File file : files) {
            try {
                forceDelete(file);
            } catch (IOException ioe) {
                exception = ioe;
            }
        }

        if (null != exception)
            throw exception;
    }

    static boolean isSystemWindows() {
        return SYSTEM_SEPARATOR == '\\';
    }

    public static Collection<File> listFiles(File directory, String suffix) {
        final String _suffix = "." + suffix;
        FileFilter filter = new FileFilter() {
            @Override
            public boolean accept(File file) {
                if (file.isDirectory())
                    return true;
                String name = file.getName();
                int endLen = _suffix.length();
                if (name.regionMatches(true, name.length() - endLen, _suffix, 0, endLen)) {
                    return true;
                }
                return false;
            }
        };
        if (!directory.isDirectory()) {
            throw new IllegalArgumentException("Parameter 'directory' is not a directory");
        }

        if (filter == null) {
            throw new NullPointerException("Parameter 'fileFilter' is null");
        }
        Collection<File> files = new LinkedList<File>();
        innerListFiles(files, directory, filter);
        return files;
    }

    public static void forceDelete(File file) throws IOException {
        if (file.isDirectory()) {
            deleteDirectory(file);
        } else {
            boolean filePresent = file.exists();
            if (!file.delete()) {
                if (!filePresent) {
                    throw new FileNotFoundException("File does not exist: " + file);
                }
                String message = "Unable to delete file: " + file;

                throw new IOException(message);
            }
        }
    }

    private static void innerListFiles(Collection<File> files, File directory, FileFilter filter) {
        File[] found = directory.listFiles(filter);
        if (found != null)
            for (File file : found)
                if (file.isDirectory())
                    innerListFiles(files, file, filter);
                else
                    files.add(file);
    }
}