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/**
 *  Copyright (c) 1997-2013, tinygroup.org ([email protected]).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.
 * --------------------------------------------------------------------------
 *  版权 (c) 1997-2013, tinygroup.org ([email protected]).
 *
 *  本开源软件遵循 GPL 3.0 协议;
 *  如果您不遵循此协议，则不被允许使用此文件。
 *  你可以从下面的地址获取完整的协议文本
 *
 *       http://www.gnu.org/licenses/gpl.html
 */
package org.tinygroup.mongodb.engine.comparemode.impl;

import org.bson.BSONObject;
import org.tinygroup.context.Context;

import com.mongodb.BasicDBObject;
import com.mongodb.QueryOperators;

/**
 * 
 * 功能说明: not null 比较模式
 * 
 * 系统版本: v1.0

 * 开发人员: wanggf 

 * 开发时间: 2013-11-28 

 * 功能描述: 写明作用，调用方式，使用场景，以及特殊情况

 */
public class IsNotNullCompareMode extends AbstractNoNeedValueCompareMode{

	public BSONObject generateBSONObject(String propertyName, Object value, Context context) {
		 BSONObject dbObject = new BasicDBObject(QueryOperators.NE, null);// 非null
		 return new BasicDBObject(propertyName, dbObject);
	}

	public String getCompareKey() {
		return "isNotNull";
	}

}