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package com.yixan.tools.common.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/**
 * KeyValue类
 *
 * @author 赵卉华
 * @version C01 2014年5月21日
 */
public class KeyValue implements Comparable>, Entry {

    /** KEY **/
    private String key;

    /** VALUE **/
    private V value;

    /** 构造函数 **/
    public KeyValue() {
    }

    /**
     * 构造函数
     *
     * @param key KEY
     * @param value VALUE
     */
    public KeyValue(String key, V value) {
        this.key = key;
        this.value = value;
    }

    /** 获取KEY **/
    @Override
    public String getKey() {
        return key;
    }

    /** 设置KEY **/
    public void setKey(String key) {
        this.key = key;
    }

    /** 获取VALUE **/
    @Override
    public V getValue() {
        return value;
    }

    /** 设置VALUE **/
    @Override
    public V setValue(V value) {
        V original = this.value;
        this.value = value;
        return original;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((key == null) ? 0 : key.hashCode());
        result = prime * result + ((value == null) ? 0 : value.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        @SuppressWarnings("rawtypes")
        KeyValue other = (KeyValue) obj;
        if (key == null) {
            if (other.key != null) {
                return false;
            }
        } else {
            if (!key.equals(other.key)) {
                return false;
            }
        }
        if (value == null) {
            if (other.value != null) {
                return false;
            }
        } else {
            if (!value.equals(other.value)) {
                return false;
            }
        }
        return true;
    }

    /**
     * List转换为Map
     *
     * @author 赵卉华
     * @param list KeyValue列表
     * @return Map
     */
    public static  Map toMap(List> list) {
        if (list == null) {
            return null;
        }

        Map map = new HashMap();
        for (KeyValue i : list) {
            map.put(i.key, i.value);
        }
        return map;
    }

    /**
     * Map转换为List
     *
     * @author 赵卉华
     * @param map Map对象
     * @return List
     */
    public static  List> toList(Map map) {
        List> entries = new ArrayList>();

        Set> original = map.entrySet();
        for (Map.Entry entry : original) {
            String key = entry.getKey();
            V value = entry.getValue();
            entries.add(new KeyValue(key, value));
        }
        return entries;
    }

    @Override
    public String toString() {
        return String.format("{%s=%s}", key, value);
    }

    @Override
    public int compareTo(KeyValue o) {
        return key == null ? 0 : key.compareTo(o.getKey());
    }
}