diff options
Diffstat (limited to 'challenge-289/luca-ferrari/pljava/src/main/java/Task1.java')
| -rw-r--r-- | challenge-289/luca-ferrari/pljava/src/main/java/Task1.java | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/challenge-289/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-289/luca-ferrari/pljava/src/main/java/Task1.java new file mode 100644 index 0000000000..9666996c9a --- /dev/null +++ b/challenge-289/luca-ferrari/pljava/src/main/java/Task1.java @@ -0,0 +1,64 @@ + + + +package PWC289; + +/** + * PL/Java implementation for PWC 289 + * Task 1 + * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-289> + * + * + * 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/PWC289-1.jar luca@rachel:/tmp + + + * To install into PostgreSQL execute: + + select sqlj.install_jar( 'file:///tmp/PWC289-1.jar', 'PWC289', true ); + select sqlj.set_classpath( 'public', 'PWC289' ); + + select pwc289.task2_pljava(); + + and then to redeploy: + + select sqlj.replace_jar( 'file:///tmp/PWC289-1.jar', 'PWC289', 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 = "pwc289", + onNullInput = RETURNS_NULL, + effects = IMMUTABLE ) + public static final int task1_pljava( int[] nums ) throws SQLException { + logger.log( Level.INFO, "Entering pwc289.task1_pljava" ); + + List<Integer> sorted = IntStream.of( nums ).boxed().sorted( Collections.reverseOrder() ) + .collect( Collectors.toList() ); + + + if ( sorted.size() >= 3 ) + return sorted.get( 3 ); + else + return sorted.get( 0 ); + + } +} |
