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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.filter;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.filter.Filter;
import ch.qos.logback.core.spi.FilterReply;

/**
 * Filters events below the threshold level.
 * 
 * Events with a level below the specified
 * level will be denied, while events with a level
 * equal or above the specified level will trigger a
 * FilterReply.NEUTRAL result, to allow the rest of the
 * filter chain process the event.
 * 
 * For more information about filters, please refer to the online manual at
 * http://logback.qos.ch/manual/filters.html#thresholdFilter
 *
 * @author Sébastien Pennec
 */
public class ThresholdFilter extends Filter {

    Level level;

    @Override
    public FilterReply decide(ILoggingEvent event) {
        if (!isStarted()) {
            return FilterReply.NEUTRAL;
        }

        if (event.getLevel().isGreaterOrEqual(level)) {
            return FilterReply.NEUTRAL;
        } else {
            return FilterReply.DENY;
        }
    }

    public void setLevel(String level) {
        this.level = Level.toLevel(level);
    }

    public void start() {
        if (this.level != null) {
            super.start();
        }
    }
}