This is the worst data structure ever

wtf.java

package uwyo.cs.acm2013.dao.model;

import java.util.HashMap;
import java.util.Map;

// import com.fasterxml.jackson.annotation.JsonAutoDetect;

// @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY) 
public class Compliance {
	public static final String TIER1 = "tier1";
	public static final String TIER2 = "tier2";

	public Map<String, Map<String, Object>> compliance_map;
	
	public Compliance(Map<String, Map<String, Object>> compliance_map) {
		super();
		this.compliance_map = compliance_map;
	}	
	public Compliance() {
		this(new HashMap<String, Map<String,Object>> ());
	}	

	private void _setCompliance(String unitCode, String outcomeCode, Object level) {
		Map<String,Object> map = compliance_map.get(unitCode);
		if (map == null) {
			map = new HashMap<String,Object> ();
			compliance_map.put(unitCode, map);
		}
		map.put(outcomeCode, level);
	}
	private Object _getCompliance(String unitCode, String outcomeCode) {
		Map<String,Object> map = compliance_map.get(unitCode);
		if (map == null)
			return null;
		return map.get(outcomeCode);
	}
	private void _removeCompliance(String unitCode, String outcomeCode) {
		Map<String,Object> map = compliance_map.get(unitCode);
		if (map == null)
			return;
		if (!map.containsKey(unitCode))
			return;
		map.remove(outcomeCode);
		if (map.isEmpty())
			compliance_map.remove(unitCode);
	}

	public void setComplianceTier(String unitCode, int tier, int hours) {
		assert tier == 1 || tier == 2;
		String key = (tier == 1 ? TIER1 : TIER2);
		if (hours > 0)
			_setCompliance(unitCode, key, hours);
		else
			_removeCompliance(unitCode, key);
	}

	public void setComplianceOutcome(String unitCode, String outcomeCode, String level) {
		if (!LearningOutcome.NONE.equals(level))
			_setCompliance(unitCode, outcomeCode, level);
		else
			_removeCompliance(unitCode, outcomeCode);
	}
	
	public int getComplianceTier(String unitCode, int tier) {
		assert tier == 1 || tier == 2;
		String key = (tier == 1 ? TIER1 : TIER2);
		Object level = _getCompliance(unitCode, key);
		if (level == null)
			return 0;
		return (int) level;
	}

	public String getComplianceOutcome(String unitCode, String outcomeCode) {
		Object level = _getCompliance(unitCode, outcomeCode);
		if (level == null)
			return LearningOutcome.NONE;
		return (String) level;
	}
}