Merge pull request #10932 from fluca1978/PWC289

PWC 289

1 files changed, 89 insertions, 0 deletions

diff --git a/challenge-289/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-289/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..8532cda167
--- /dev/null
+++ b/challenge-289/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,89 @@
+
+
+
+package PWC289;
+
+/**
+ * PL/Java implementation for PWC 289
+ * Task 2
+ * 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;
+import java.util.regex.*;
+
+public class Task2 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc289",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String[] task2_pljava( String[] words ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc289.task2_pljava" );
+
+	List<String> result = new LinkedList<String>();
+
+	for ( String current : words ) {
+	    String[] letters = current.split( "" );
+
+
+	    int last_index = letters.length - 1;
+	    int first_index = 0;
+
+	    Pattern pattern = Pattern.compile( "^[a-z0-9A-Z]$" );
+
+
+	    while ( ! pattern.matcher( letters[ last_index ] ).find() )
+		last_index--;
+
+	    List<String> shuffling = new LinkedList<String>();
+	    for ( int i = 1; i < last_index; i++ )
+		shuffling.add( letters[ i ] );
+
+	    Collections.shuffle( shuffling );
+
+	    String current_result = letters[ first_index ] + String.join( "", shuffling );
+	    for ( int i = last_index; i < letters.length; i++ )
+		current_result += letters[ i ];
+
+	    result.add( current_result );
+	}
+
+	String[] output = new String[ result.size() ];
+	for ( int i = 0; i < output.length; i++ )
+	    output[ i ] = result.get( i );
+
+	return output;
+    }
+}