diff options
Diffstat (limited to 'challenge-289/luca-ferrari/pljava/src/main/java/Task2.java')
| -rw-r--r-- | challenge-289/luca-ferrari/pljava/src/main/java/Task2.java | 89 |
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; + } +} |
