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/**
 * Copyright (c) 2011-2017, James Zhan 詹波 ([email protected]).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jfinal.kit;

import java.util.LinkedHashMap;
import java.util.Map;
import com.jfinal.json.Json;

/**
 * Okv (Ordered Key Value) 
 * 
 * Okv 与 Kv 的唯一区别在于 Okv 继承自 LinkedHashMap，而 Kv 继承自 HashMap
 * 所以对 Okv 中的数据进行迭代输出的次序与数据插入的先后次序一致
 * 
 * Example：
 *    Okv para = Okv.by("id", 123);
 *    User user = user.findFirst(getSqlPara("find", para));
 */
@SuppressWarnings({"serial", "rawtypes", "unchecked"})
public class Okv extends LinkedHashMap {
	
	public Okv() {
	}
	
	public static Okv by(Object key, Object value) {
		return new Okv().set(key, value);
	}
	
	public static Okv create() {
		return new Okv();
	}
	
	public Okv set(Object key, Object value) {
		super.put(key, value);
		return this;
	}
	
	public Okv set(Map map) {
		super.putAll(map);
		return this;
	}
	
	public Okv set(Okv okv) {
		super.putAll(okv);
		return this;
	}
	
	public Okv delete(Object key) {
		super.remove(key);
		return this;
	}
	
	public  T getAs(Object key) {
		return (T)get(key);
	}
	
	public String getStr(Object key) {
		Object s = get(key);
		return s != null ? s.toString() : null;
	}
	
	public Integer getInt(Object key) {
		Number n = (Number)get(key);
		return n != null ? n.intValue() : null;
	}
	
	public Long getLong(Object key) {
		Number n = (Number)get(key);
		return n != null ? n.longValue() : null;
	}
	
	public Number getNumber(Object key) {
		return (Number)get(key);
	}
	
	public Boolean getBoolean(Object key) {
		return (Boolean)get(key);
	}
	
	/**
	 * key 存在，并且 value 不为 null
	 */
	public boolean notNull(Object key) {
		return get(key) != null;
	}
	
	/**
	 * key 不存在，或者 key 存在但 value 为null
	 */
	public boolean isNull(Object key) {
		return get(key) == null;
	}
	
	/**
	 * key 存在，并且 value 为 true，则返回 true
	 */
	public boolean isTrue(Object key) {
		Object value = get(key);
		return (value instanceof Boolean && ((Boolean)value == true));
	}
	
	/**
	 * key 存在，并且 value 为 false，则返回 true
	 */
	public boolean isFalse(Object key) {
		Object value = get(key);
		return (value instanceof Boolean && ((Boolean)value == false));
	}
	
	public String toJson() {
		return Json.getJson().toJson(this);
	}
	
	public boolean equals(Object okv) {
		return okv instanceof Okv && super.equals(okv);
	}
}