package com.crystal.sharedpreferences.util;

import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

/**
 * SharedPreferences工具类：用于保存数据
 * @author crystal
 * @date 2015-1-1 23:21
 */
public class SharedPreferencesUtils {

	/**
	 * 保存在手机里的文件名
	 */
	public static final String FILE_NAME = "crystal_data";
	
	/**
	 * 保存数据
	 * @param context 上下文
	 * @param key key
	 * @param obj value
	 */
	public static void put(Context context,String key,Object obj){
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
		Editor editor = sp.edit();
		
		if(obj instanceof Boolean){
			editor.putBoolean(key, (Boolean)obj);
		}else if(obj instanceof Float){
			editor.putFloat(key, (Float)obj);
		}else if(obj instanceof Integer){
			editor.putInt(key, (Integer)obj);
		}else if(obj instanceof Long){
			editor.putLong(key, (Long)obj);
		}else{
			editor.putString(key, (String)obj);
		}
		editor.commit();
	}
	
	/**
	 * 获取指定的数据
	 * @param context
	 * @param key
	 * @param defaultObj
	 * @return
	 */
	public static Object get(Context context,String key,Object defaultObj){
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
		
		if(defaultObj instanceof Boolean){
			return sp.getBoolean(key, (Boolean)defaultObj);
		}else if(defaultObj instanceof Float){
			return sp.getFloat(key, (Float)defaultObj);
		}else if(defaultObj instanceof Integer){
			return sp.getInt(key, (Integer)defaultObj);
		}else if(defaultObj instanceof Long){
			return sp.getLong(key, (Long)defaultObj);
		}else if(defaultObj instanceof String){
			return sp.getString(key, (String)defaultObj);
		}
		return null;
	}
	
	/**
	 * 删除指定的数据
	 * @param key
	 */
	public static void remove(Context context,String key){
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
		Editor editor = sp.edit();
		editor.remove(key);
		editor.commit();
	}
	
	/**
	 * 返回所有的键值对
	 * @return
	 */
	public static Map<String,?> getAll(Context context){
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
		Map<String,?> map = sp.getAll();
		return map;
	}
	
	/**
	 * 清除所有数据
	 * @param context
	 */
	public static void clear(Context context){
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
		Editor editor = sp.edit();
		editor.clear();
		editor.commit();
	}
	
	/**
	 * 检查是否存在此key对应的数据
	 * @param context
	 * @param key
	 * @return
	 */
	public static boolean contains(Context context,String key){
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);
		return sp.contains(key);
	}
	
	
	
	
	
	
}

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