logback-android/src/main/java/ch/qos/logback/classic/spi/TurboFilterList.java
public FilterReply getTurboFilterChainDecision(final Marker marker,
      final Logger logger, final Level level, final String format,
      final Object[] params, final Throwable t) {
    
    
    final int size = size();
//    if (size == 0) {
//      return FilterReply.NEUTRAL;
//    }
    if (size == 1) {
      try {
        TurboFilter tf = get(0);
        return tf.decide(marker, logger, level, format, params, t);
      } catch (IndexOutOfBoundsException iobe) {
        return FilterReply.NEUTRAL;
      }
    }
    
    Object[] tfa = toArray();
    final int len = tfa.length;
    for (int i = 0; i < len; i++) {
    //for (TurboFilter tf : this) {
      final TurboFilter tf = (TurboFilter) tfa[i];
      final FilterReply r = tf.decide(marker, logger, level, format, params, t);
      if (r == FilterReply.DENY || r == FilterReply.ACCEPT) {
        return r;
      }
    }
    return FilterReply.NEUTRAL;
  }
public FilterReply getTurboFilterChainDecision(final Marker marker,
      final Logger logger, final Level level, final String format,
      final Object[] params, final Throwable t) {
    
    
    final int size = size();
//    if (size == 0) {
//      return FilterReply.NEUTRAL;
//    }
    if (size == 1) {
      try {
        TurboFilter tf = get(0);
        return tf.decide(marker, logger, level, format, params, t);
      } catch (IndexOutOfBoundsException iobe) {
        return FilterReply.NEUTRAL;
      }
    }
    
    Object[] tfa = toArray();
    final int len = tfa.length;
    for (int i = 0; i < len; i++) {
    //for (TurboFilter tf : this) {
      final TurboFilter tf = (TurboFilter) tfa[i];
      final FilterReply r = tf.decide(marker, logger, level, format, params, t);
      if (r == FilterReply.DENY || r == FilterReply.ACCEPT) {
        return r;
      }
    }
    return FilterReply.NEUTRAL;
  }
Loop through the filters in the chain. As soon as a filter decides on
ACCEPT or DENY, then that value is returned. If all of the filters return
NEUTRAL, then NEUTRAL is returned.