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package PWC276;
/**
* PL/Java implementation for PWC 276
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-276>
*
*
* 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/PWC276-1.jar luca@rachel:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC276-1.jar', 'PWC276', true );
select sqlj.set_classpath( 'public', 'PWC276' );
select pwc276.task2_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC276-1.jar', 'PWC276', 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 = "pwc276",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final String[] task1_pljava( int[] hours ) throws SQLException {
logger.log( Level.INFO, "Entering pwc276.task1_pljava" );
List<String> result = new LinkedList<String>();
for ( int i = 0; i < hours.length - 1; i++ )
for ( int j = i + 1; j < hours.length; j++ )
if ( ( hours[ i ] + hours[ j ] ) % 24 == 0 )
result.add( String.format( "%02d + %02d", hours[ i ], hours[ j ] ) );
return result.toArray( new String[ 0 ] );
}
}
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