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package PWC256;
/**
* PL/Java implementation for PWC 256
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-256>
*
*
* 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/PWC256.jar luca@venkman:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC256.jar', 'PWC256', true );
select 256.task1_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC256.jar', 'PWC256', 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.sql.SQLException;
import java.util.logging.*;
public class Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( schema = "256",
onNullInput = RETURNS_NULL,
effects = IMMUTABLE )
public static final int task1_pljava( String[] words ) throws SQLException {
logger.log( Level.INFO, "Entering task1_pljava" );
int max = 0;
for ( String current : words ) {
int count = count( current, words );
if ( count > max )
max = count;
}
return max;
}
private static final int count( String word, String[] words ) {
int count = 0;
StringBuilder builder = new StringBuilder();
builder.append( word );
word = builder.reverse().toString();
for ( String w : words )
if ( w.equals( word ) )
count++;
return count;
}
}
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