How to use

SupplierE

in

de.pfabulist.unchecked.functiontypes

public <T, E extends Exception> T getOrElse( Class<T> klass, String key, SupplierE<T, E> els ) {
  Object val = props.get( key );
  if( val == null ) {
    return els.get();
  }
  if( !klass.isAssignableFrom( val.getClass() ) ) {
    throw new IllegalStateException( "niotest error: wrong class for: " + key + " expected: " + klass + " got: " + val.getClass() );
  }
  return klass.cast( val );
}

public static
<T,X extends Exception> T _orElseGet( @Nullable T t, SupplierE<T,X> supp) {
  if( t == null ) {
    return supp._get();
  }
  return t;
}

public Object read( FileAttributeView view, String attiName ) {
  checkViewType( view );
  return reads.getOrThrow( attiName,
               new IllegalArgumentException( "attribute " + attiName + " not in view " + getViewName() ) )
      .apply( v( () -> readType.cast( viewType.cast( view ).readAttributes() ) ) );
}

default R _get() {
  try {
    return getE();
  } catch( Exception e ) {
    throw Unchecked.u( e );
  }
}

/**
 * if the the FAV is actually a BasicFileAttributeView then there is an isLink method
 * if this is not already set and FAV implements LinkInfoSettable use it to add this link info
 */
@SuppressWarnings( "PMD.CollapsibleIfStatements" )
private <V extends FileAttributeView> V addIsLinkIfPossible( Class<V> type, V fav ) {
  if( BasicFileAttributeView.class.isAssignableFrom( type ) ) {
    if( (! v( () -> BasicFileAttributeView.class.cast( fav ).readAttributes()).isSymbolicLink() )) {
      if( !( fav instanceof LinkInfoSettable ) ) {
        throw new UnsupportedOperationException( "the attribute view need to implement LinkInfoSettable in order to make SymLinks work" );
      }
      ( (LinkInfoSettable) ( fav ) ).setLink();
    }
  }
  return fav;
}

static <T, E extends Exception> T v( SupplierE<T, E> f ) {
  return _nn( f.get() );
}

@Override
default
@Nullable
R get() {
  return _get();
}

@Override
public <A extends BasicFileAttributes> A getReadAttributes( Class<A> read, FileAttributeView fav ) {
  checkViewType( fav );
  checkReadType( read );
  return read.cast( v( () -> viewType.cast( fav ).readAttributes() ) );
}

public static <T, E extends Exception> T u( SupplierE<T, E> f ) {
  return _nn(f.get());
}

public static <T, X extends Throwable, E extends Exception> T _orElseExpectedThrow( @Nullable T t, SupplierE<X, E> exceptionSupplier ) {
  if( t == null ) {
    throw Unchecked.u( exceptionSupplier._get() );
  }
  return t;
}

public static <T, X extends Throwable, E extends Exception> T _orElseThrow( @Nullable T t, SupplierE<X, E> exceptionSupplier ) {
  if( t == null ) {
    logger.warn( "value is null " + getProblemMethod() );
    throw Unchecked.u( exceptionSupplier._get() );
  }
  return t;
}