1 files changed, 92 insertions, 0 deletions
diff --git a/challenge-270/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-270/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..5735002d25
--- /dev/null
+++ b/challenge-270/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,92 @@
+
+
+
+package PWC270;
+
+/**
+ * PL/Java implementation for PWC 270
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-270>
+ *
+ *
+ * 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/PWC270-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC270-1.jar', 'PWC270', true );
+ select sqlj.set_classpath( 'public', 'PWC270' );
+
+ select pwc270.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC270-1.jar', 'PWC270', 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 Task2 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc270",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int task2_pljava( int score_single, int score_double, int[] numbers ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc270.task2_pljava" );
+
+	int score = 0;
+	List<Integer> nums = Arrays.stream( numbers ).boxed().collect( Collectors.toList() );
+
+	// get the max
+	Integer max = nums.stream().max( Integer::compare ).get();
+
+	List<Integer> needs_operation = new LinkedList<Integer>();
+	do {
+	    needs_operation.clear();
+	    IntStream
+		.range( 0, nums.size() - 1 )
+		.forEach( index -> {
+			if ( nums.get( index ) < max )
+			    needs_operation.add( index );
+		    } );
+
+
+	    if ( needs_operation.size() == 1 ) {
+		score += score_single;
+		int index = needs_operation.get( 0 );
+		int value = nums.get( index );
+		nums.set( index, ++value );
+	    }
+	    else if ( needs_operation.size() >= 2 ) {
+		score += score_double;
+
+		for ( int i = 0; i < 2; i ++ ) {
+		    int index = needs_operation.get( i );
+		    int value = nums.get( index );
+		    nums.set( index, ++value );
+		}
+	    }
+
+	} while ( ! needs_operation.isEmpty() );
+
+	return score;
+
+    }
+}