Java Path File Read nio setReadable(final Path path, boolean readable)

Description

set Readable

License

LGPL

Declaration

public static void setReadable(final Path path, boolean readable) throws IOException 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclEntryPermission;
import java.nio.file.attribute.AclEntryType;
import java.nio.file.attribute.AclFileAttributeView;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.UserPrincipal;
import java.util.List;
import java.util.Locale;
import java.util.Set;

public class Main {
    public static void setReadable(final Path path, boolean readable) throws IOException {
        if (isWindows()) {
            // Set permissions using DOS

            final UserPrincipal currentUser = path.getFileSystem().getUserPrincipalLookupService()
                    .lookupPrincipalByName(System.getProperty("user.name"));

            // get view
            final AclFileAttributeView view = Files.getFileAttributeView(path, AclFileAttributeView.class);

            // create ACE to set read access for the current user
            final AclEntryType entryType = readable ? AclEntryType.ALLOW : AclEntryType.DENY;
            final AclEntry entry = AclEntry.newBuilder().setType(entryType).setPrincipal(currentUser)
                    .setPermissions(AclEntryPermission.READ_DATA, AclEntryPermission.READ_ATTRIBUTES).build();

            // read ACL, insert ACE, re-write ACL
            final List<AclEntry> acl = view.getAcl();
            acl.add(0, entry); // insert before any DENY entries
            view.setAcl(acl);//  ww w  . j  av  a2  s .c om

        } else {
            // Set permissions using POSIX
            final Set<PosixFilePermission> perms = Files.getPosixFilePermissions(path);
            if (readable) {
                perms.add(PosixFilePermission.OWNER_READ);
                perms.add(PosixFilePermission.GROUP_READ);
                perms.add(PosixFilePermission.OTHERS_READ);
            } else {
                perms.remove(PosixFilePermission.OWNER_READ);
                perms.remove(PosixFilePermission.GROUP_READ);
                perms.remove(PosixFilePermission.OTHERS_READ);
            }
            Files.setPosixFilePermissions(path, perms);
        }
    }

    public static boolean isWindows() {
        return System.getProperty("os.name").toLowerCase(Locale.ENGLISH).contains("windows");
    }
}

Related

1. readSheBang(Path script)
2. readStringFromPath(Path path)
3. readTextFile(Path p)
4. readTextFileFromResources(String filepath, ClassLoader classLoader)
5. readTextFromFile(String textFilePath)
6. setReadOnly(Path file)