diff options
Diffstat (limited to 'challenge-278/luca-ferrari/pljava/src/main/java/Task2.java')
| -rw-r--r-- | challenge-278/luca-ferrari/pljava/src/main/java/Task2.java | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/challenge-278/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-278/luca-ferrari/pljava/src/main/java/Task2.java new file mode 100644 index 0000000000..ad79c4417f --- /dev/null +++ b/challenge-278/luca-ferrari/pljava/src/main/java/Task2.java @@ -0,0 +1,74 @@ + + + +package PWC278; + +/** + * PL/Java implementation for PWC 278 + * Task 2 + * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-278> + * + * + * 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/PWC278-1.jar luca@rachel:/tmp + + + * To install into PostgreSQL execute: + + select sqlj.install_jar( 'file:///tmp/PWC278-1.jar', 'PWC278', true ); + select sqlj.set_classpath( 'public', 'PWC278' ); + + select pwc278.task2_pljava(); + + and then to redeploy: + + select sqlj.replace_jar( 'file:///tmp/PWC278-1.jar', 'PWC278', 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 = "pwc278", + onNullInput = RETURNS_NULL, + effects = IMMUTABLE ) + public static final String task2_pljava( String word, String c ) throws SQLException { + logger.log( Level.INFO, "Entering pwc278.task2_pljava" ); + + if ( ! word.contains( c ) ) + return word; + + final List<String> left = new LinkedList<String>(); + final List<String> right = new LinkedList<String>(); + final boolean[] found = { false }; + Stream.of( word.split( "" ) ).forEach( letter -> { + if ( found[ 0 ] ) + right.add( letter ); + else { + left.add( letter ); + + if ( letter.equals( c ) ) + found[ 0 ] = true; + } + } ); + + Collections.sort( left ); + return left.stream().collect( Collectors.joining() ) + right.stream().collect( Collectors.joining() ); + } +} |
