PWC 264

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, 79 insertions, 0 deletions

diff --git a/challenge-264/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-264/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..718e4e61ca
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+++ b/challenge-264/luca-ferrari/pljava/src/main/java/Task2.java
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+
+
+
+package PWC264;
+
+/**
+ * PL/Java implementation for PWC 264
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-264>
+ *
+ *
+ * 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/PWC264-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC264-1.jar', 'PWC264', true );
+ select sqlj.set_classpath( 'public', 'PWC264' );
+
+ select pwc264.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC264-1.jar', 'PWC264', 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 = "pwc264",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int[] task2_pljava( int[] source, int[] indexes ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc264.task2_pljava" );
+
+	List<Integer> target = new LinkedList<Integer>();
+
+	for ( int i = 0; i < indexes.length; i++ ) {
+	    int target_index = indexes[ i ];
+	    if ( target.isEmpty() ||  target.size() <= target_index )
+		target.add( source[ i ] );
+	    else {
+		List<Integer> replace = new LinkedList<Integer>();
+		for ( int ii = 0; ii < target_index; ii++ )
+		    replace.add( target.get( ii ) );
+		replace.add( source[ i ] );
+		for ( int ii = target_index; ii < target.size(); ii++ )
+		    replace.add( target.get( ii ) );
+
+		target = replace;
+	    }
+	}
+
+	int[] result = new int[ target.size() ];
+	int k = 0;
+	for ( int v : target )
+	    result[ k++ ] = v;
+
+	return result;
+    }
+}