aboutsummaryrefslogtreecommitdiff
path: root/challenge-289/luca-ferrari/pljava/src/main/java/Task1.java
diff options
context:
space:
mode:
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.java64
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 );
+
+ }
+}