PWC 257

Task 1 Raku done
Task 2 Raku done

Task 1 PL/Perl done
Task 2 PL/Perl done

Task 1 PL/PgSQL done
Task 2 PL/PgSQL done

Task 1 Python done
Task 2 Python done

Task 1 PL/Java done
Task2  PL/java done

1 files changed, 83 insertions, 0 deletions

diff --git a/challenge-257/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-257/luca-ferrari/pljava/src/main/java/Task1.java
new file mode 100644
index 0000000000..bfbdaf121b
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+++ b/challenge-257/luca-ferrari/pljava/src/main/java/Task1.java
@@ -0,0 +1,83 @@
+package PWC257;
+
+/**
+ * PL/Java implementation for PWC 257
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-257>
+ *
+ *
+ * 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/PWC257.jar  luca@venkman:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC257.jar', 'PWC257', true );
+
+ select 257.task1_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC257.jar', 'PWC257', 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 org.postgresql.pljava.ResultSetProvider;
+import java.sql.ResultSet;
+
+import java.util.*;
+import java.sql.SQLException;
+import java.util.logging.*;
+
+public class Task1 implements ResultSetProvider {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc257",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final ResultSetProvider task1_pljava( int[] numbers ) throws SQLException {
+	logger.log( Level.INFO, "Entering task1_pljava" );
+	return new Task1( numbers );
+
+    }
+
+    public Task1( int[] nums ) {
+	numbers = nums;
+    }
+
+    private int[] numbers;
+
+    @Override
+    public boolean assignRowValues(ResultSet receiver, int currentRow)
+	throws SQLException {
+
+	if ( currentRow >= numbers.length )
+	    return false;
+
+	int current = numbers[ currentRow  ];
+
+	int count = 0;
+	for ( int other : numbers )
+	    if ( other < current )
+		count++;
+
+	receiver.updateInt( 1, count );
+	return true;
+
+    }
+
+
+
+    @Override
+    public void close() { }
+
+}