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
69
70
71
72
73
74
75
76
|
package PWC333;
/**
* PL/Java implementation for PWC 333
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-333>
*
*
* 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/PWC333-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC333-1.jar', 'PWC333', true );
select sqlj.set_classpath( 'public', 'PWC333' );
select pwc333.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC333-1.jar', 'PWC333', 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 = "pwc333",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final boolean task1_pljava( int coordinates[] ) throws SQLException {
logger.log( Level.INFO, "Entering pwc333.task1_pljava" );
List<Map<String, Integer>> coords = new LinkedList<Map<String, Integer>>();
for ( int i = 0; i < coordinates.length - 1; i++ ) {
Map<String, Integer> current = new HashMap<String, Integer>();
current.put( "x", coordinates[ i++ ] );
current.put( "y", coordinates[ i ] );
coords.add( current );
}
Map<String, Integer> first = coords.get( 0 );
Map<String, Integer> second = coords.get( 1 );
for ( int i = 2; i < coords.size(); i++ ) {
Map<String, Integer> current = coords.get( i );
if ( ( current.get( "x" ) - first.get( "x" ) ) * ( first.get( "y" ) - second.get( "y" ) )
!= ( current.get( "y" ) - first.get( "y" ) ) * ( first.get( "x" ) - second.get( "x" ) ) )
return false;
}
return true;
}
}
|
