PWC 325

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 PL/Java done
Task 2 PL/Java done

Task 1 Python done
Task 2 Python done

1 files changed, 74 insertions, 0 deletions

diff --git a/challenge-325/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-325/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..aa4fdedeee
--- /dev/null
+++ b/challenge-325/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,74 @@
+
+
+
+package PWC325;
+
+/**
+ * PL/Java implementation for PWC 325
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-325>
+ *
+ *
+ * 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/PWC325-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC325-1.jar', 'PWC325', true );
+ select sqlj.set_classpath( 'public', 'PWC325' );
+
+ select pwc325.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC325-1.jar', 'PWC325', 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 = "pwc325",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int[] task2_pljava( int[] prices ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc325.task2_pljava" );
+
+	List<Integer> new_prices = new LinkedList<Integer>();
+
+	for ( int i = 0; i < prices.length; i++ ) {
+	    int current = prices[ i ];
+
+	    for ( int j = i + 1; j < prices.length; j++ )
+		if ( prices[ j ] < prices[ i ] ) {
+		    current -= prices[ j ];
+		    break;
+		}
+
+	    new_prices.add( current );
+	}
+
+	int result[] = new int[ new_prices.size() ];
+	for ( int i = 0; i < new_prices.size(); i++ )
+	    result[ i ] = new_prices.get( i );
+
+	return result;
+    }
+}