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package PWC254;
/**
* PL/Java implementation for PWC 254
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-254>
*
*
* 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/PWC253-1.jar luca@venkman:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC254-1.jar', 'PWC254', true );
select sqlj.set_classpath( 'public', 'PWC254' );
select task1_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC254-1.jar', 'PWC254', 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 Task2 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE )
public static final String task2_pljava( String word ) throws SQLException {
String result = "";
Stack<String> vowels = new Stack<String>();
for ( String letter : word.split( "" ) ) {
if ( isVowel( letter ) )
vowels.push( letter );
}
for ( String letter : word.split( "" ) ) {
if ( ! isVowel( letter ) || vowels.empty() )
result += letter;
else
result += vowels.pop();
}
return result;
}
public static final boolean isVowel( String letter ) {
return letter.toLowerCase().equals( "a" )
|| letter.toLowerCase().equals( "e" )
|| letter.toLowerCase().equals( "i" )
|| letter.toLowerCase().equals( "o" )
|| letter.toLowerCase().equals( "u" );
}
}
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