blob: be0d7021446369f17965ed9faef9869c3850395e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
package PWC273;
/**
* PL/Java implementation for PWC 273
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-273>
*
*
* To compile on the local machine:
$ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/ # if not already set
$ mvn clean build
$ scp target/PWC273-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC273-1.jar', 'PWC273', true );
select sqlj.set_classpath( 'public', 'PWC273' );
select pwc273.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC273-1.jar', 'PWC273', true );
*/
import org.postgresql.pljava.*;
import org.postgresql.pljava.annotation.Function;
import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;
import java.util.*;
import java.util.stream.*;
import java.sql.SQLException;
import java.util.logging.*;
import java.sql.ResultSet;
import java.sql.Date;
public class Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "pwc273",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int task1_pljava( String s, String c ) throws SQLException {
logger.log( Level.INFO, "Entering pwc273.task1_pljava" );
if ( c.length() != 1 )
throw new SQLException( "Need a single char!" );
final int[] values = new int[]{ 0, 0 };
values[ 1 ] = s.length();
Stream.of( s.split( "" ) )
.forEach( cc -> {
if ( cc.equals( c ) )
values[ 0 ]++;
} );
return (int) Math.round( (double) values[ 0 ] / values[ 1 ] * 100 );
}
}
|
