lastNLines - read last n lines of file [1004746]

< > BotCompany Repo | #1004746 // lastNLines - read last n lines of file

JavaX fragment (include)

lib 1003724

import org.apache.commons.io.input.ReversedLinesFileReader;

static LS lastNLines(File f, int n) ctex {
  if (f == null) ret emptyList();
  
  try {
    ReversedLinesFileReader r = new(f);
    try {
      new LS l;
      while(l(l) < n) {
        S s = r.readLine();
        if (s == null) break;
        l.add(s);
      }
      ret reversedList(l);
    } finally {
      r.close();
    }
  } catch (FileNotFoundException e) {
    ret emptyList();
  }
}

static L<S> lastNLines(int n, File f) {
  ret lastNLines(f, n);
}

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Snippet ID:

#1004746

Snippet name:

lastNLines - read last n lines of file

Eternal ID of this version:

#1004746/5

Text MD5:

c88db94340cad58f9a8acf3079db7533

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2023-01-15 18:52:40

Source code size:

560 bytes / 28 lines

Pitched / IR pitched:

No / No

Views / Downloads:

724 / 719

Version history:

4 change(s)

Referenced in:

[show references]

1	lib 1003724
2
3	import org.apache.commons.io.input.ReversedLinesFileReader;
4
5	static LS lastNLines(File f, int n) ctex {
6	if (f == null) ret emptyList();
7
8	try {
9	ReversedLinesFileReader r = new(f);
10	try {
11	new LS l;
12	while(l(l) < n) {
13	S s = r.readLine();
14	if (s == null) break;
15	l.add(s);
16	}
17	ret reversedList(l);
18	} finally {
19	r.close();
20	}
21	} catch (FileNotFoundException e) {
22	ret emptyList();
23	}
24	}
25
26	static L<S> lastNLines(int n, File f) {
27	ret lastNLines(f, n);
28	}