package cn.config.mapping;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

/**
 * 
 * @author yangsong
 * @date 2014/12/14
 */
public class URIMappingCache {
	private static URIMappingCache instance = null;

	private Map<URIMappingKey,URIMappingValue> mappingStore = new TreeMap<URIMappingKey,URIMappingValue>(new Comparator<URIMappingKey>() {
		public int compare(URIMappingKey o1, URIMappingKey o2) {
			if (o1 == null && o2 == null) return 0; 
			if (o1 == null && o2 != null) return 1; 
			if (o1 != null && o2 == null) return -1; 
			if (o1.getUri() == null && o2.getUri() == null) return 0; 
			if (o1.getUri() == null && o2.getUri() != null) return 1; 
			if (o1.getUri() != null && o2.getUri() == null) return -1; 
			int r = o1.getUri().compareTo(o2.getUri());
			if(r==0){
				if (o1.getHttpMethod() == null && o2.getHttpMethod() == null) return 0; 
				if (o1.getHttpMethod() == null && o2.getHttpMethod() != null) return 1; 
				if (o1.getHttpMethod() != null && o2.getHttpMethod() == null) return -1; 
				r = o1.getHttpMethod().compareTo(o2.getHttpMethod());
			}
			return r;
		}
	});

	
	private URIMappingCache(){
		
	}
	
	public static synchronized URIMappingCache getInstance(){
		if(instance == null){
			instance = new URIMappingCache();
		}
		return instance;
	}
	
	public void put(URIMappingKey key,URIMappingValue value){
		mappingStore.put(key, value);
	}
	
	public URIMappingValue get(URIMappingKey key){
		return mappingStore.get(key);
	}
	
	public void clear(){
		mappingStore.clear();
	}
	
	public List<URIMappingKey> listURIMappingKeys(){
		List<URIMappingKey> keyList = new ArrayList<URIMappingKey>();
		keyList.addAll(mappingStore.keySet());
		return keyList;
	}

	public Map<URIMappingKey, URIMappingValue> getMappingStore() {
		return mappingStore;
	}

}