Task: Append a record to the end of a text file





Java: import static java.util.Objects.requireNonNull;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class RecordAppender {
    static class Record {
        private final String account;
        private final String password;
        private final int uid;
        private final int gid;
        private final List<String> gecos;
        private final String directory;
        private final String shell;

        public Record(String account, String password, int uid, int gid, List<String> gecos, String directory, String shell) {
            this.account = requireNonNull(account);
            this.password = requireNonNull(password);
            this.uid = uid;
            this.gid = gid;
            this.gecos = requireNonNull(gecos);
            this.directory = requireNonNull(directory);
            this.shell = requireNonNull(shell);
        }

        @Override
        public String toString() {
            return account + ':' + password + ':' + uid + ':' + gid + ':' + String.join(",", gecos) + ':' + directory + ':' + shell;
        }

        public static Record parse(String text) {
            String[] tokens = text.split(":");
            return new Record(
                    tokens[0],
                    tokens[1],
                    Integer.parseInt(tokens[2]),
                    Integer.parseInt(tokens[3]),
                    Arrays.asList(tokens[4].split(",")),
                    tokens[5],
                    tokens[6]);
        }
    }

    public static void main(String[] args) throws IOException {
        List<String> rawData = Arrays.asList(
                "jsmith:x:1001:1000:Joe Smith,Room 1007,(234)555-8917,(234)555-0077,[email protected]:/home/jsmith:/bin/bash",
                "jdoe:x:1002:1000:Jane Doe,Room 1004,(234)555-8914,(234)555-0044,[email protected]:/home/jdoe:/bin/bash",
                "xyz:x:1003:1000:X Yz,Room 1003,(234)555-8913,(234)555-0033,[email protected]:/home/xyz:/bin/bash"
        );

        List<Record> records = rawData.stream().map(Record::parse).collect(Collectors.toList());

        Path tmp = Paths.get("_rosetta", ".passwd");
        Files.createDirectories(tmp.getParent());
        Files.write(tmp, (Iterable<String>) records.stream().limit(2).map(Record::toString)::iterator);

        Files.write(tmp, Collections.singletonList(records.get(2).toString()), StandardOpenOption.APPEND);

        try (Stream<String> lines = Files.lines(tmp)) {
            lines.map(Record::parse).forEach(System.out::println);
        }
    }
}







Ada: with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
with Ada.Strings.Bounded;

procedure Main is
   package data_string is new Ada.Strings.Bounded.Generic_Bounded_Length(80);
   use data_string;
   
   type GCOSE_Rec is record
      Full_Name : Bounded_String;
      Office    : Bounded_String;
      Extension : Bounded_String;
      Homephone : Bounded_String;
      Email     : Bounded_String;
   end record;
   
   type Password_Rec is record
      Account   : Bounded_String;
      Password  : Bounded_String;
      Uid       : Natural;
      Gid       : Natural;
      GCOSE     : GCOSE_Rec;
      Directory : Bounded_String;
      Shell     : Bounded_String;
   end record;
   
   function To_String(Item : GCOSE_Rec) return String is
   begin
      return To_String(Item.Full_Name) & "," &
        To_String(Item.Office) & "," &
        To_String(Item.Extension) & "," &
        To_String(Item.Homephone) & "," &
        To_String(Item.Email);
   end To_String;
   
   function To_String(Item : Password_Rec) return String is
      uid_str : string(1..4);
      gid_str : string(1..4);
      Temp : String(1..5);
   begin
      Temp := Item.Uid'Image;
      uid_str := Temp(2..5);
      Temp := Item.Gid'Image;
      gid_str := Temp(2..5);
      return To_String(Item.Account) & ":" &
        To_String(Item.Password) & ":" &
        uid_str & ":" & gid_str & ":" &
        To_String(Item.GCOSE) & ":" &
        To_String(Item.Directory) & ":" &
        To_String(Item.Shell);
   end To_String;
   
   Pwd_List : array (1..3) of Password_Rec;
   
   Filename : String := "password.txt";
   The_File : File_Type;
   Line : String(1..256);
   Length : Natural;
begin
   Pwd_List(1) := (Account => To_Bounded_String("jsmith"),
                   Password => To_Bounded_String("x"),
                   Uid => 1001, GID => 1000,
                   GCOSE => (Full_Name => To_Bounded_String("Joe Smith"),
                             Office => To_Bounded_String("Room 1007"),
                             Extension => To_Bounded_String("(234)555-8917"),
                             Homephone => To_Bounded_String("(234)555-0077"),
                             email => To_Bounded_String("jsmith@rosettacode.org")),
                   directory => To_Bounded_String("/home/jsmith"),
                   shell => To_Bounded_String("/bin/bash"));
   Pwd_List(2) := (Account => To_Bounded_String("jdoe"),
                   Password => To_Bounded_String("x"),
                   Uid => 1002, GID => 1000,
                   GCOSE => (Full_Name => To_Bounded_String("Jane Doe"),
                             Office => To_Bounded_String("Room 1004"),
                             Extension => To_Bounded_String("(234)555-8914"),
                             Homephone => To_Bounded_String("(234)555-0044"),
                             email => To_Bounded_String("jdoe@rosettacode.org")),
                   directory => To_Bounded_String("/home/jdoe"),
                   shell => To_Bounded_String("/bin/bash"));
   Pwd_List(3) := (Account => To_Bounded_String("xyz"),
                   Password => To_Bounded_String("x"),
                   Uid => 1003, GID => 1000,
                   GCOSE => (Full_Name => To_Bounded_String("X Yz"),
                             Office => To_Bounded_String("Room 1003"),
                             Extension => To_Bounded_String("(234)555-8913"),
                             Homephone => To_Bounded_String("(234)555-0033"),
                             email => To_Bounded_String("xyz@rosettacode.org")),
                   directory => To_Bounded_String("/home/xyz"),
                   shell => To_Bounded_String("/bin/bash"));
   Create(File => The_File,
          Mode => Out_File,
          Name => Filename);
   
   for I in 1..2 loop
      Put_Line(File => The_File,
               Item => To_String(Pwd_List(I)));
   end loop;
   Reset(File => The_File,
         Mode => In_File);
   while not End_Of_File(The_File) loop
      Get_Line(File => The_File,
               Item => Line,
               Last => Length);
      Put_Line(Line(1..Length));
   end loop;
   New_Line;
   Reset(File => The_File,
         Mode => Append_File);
   Put_Line(File => The_File,
            Item => To_String(Pwd_List(3)));
   Reset(File => The_File,
         Mode => In_File);
   while not End_Of_File(The_File) loop
      Get_Line(File => The_File,
               Item => Line,
               Last => Length);
      Put_Line(Line(1..Length));
   end loop;
   Close(The_File);
end Main;