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Buession Framework Data Access Object
There is a newer version: 2.3.3
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to you 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.
 *
 * =================================================================================================
 *
 * This software consists of voluntary contributions made by many individuals on behalf of the
 * Apache Software Foundation. For more information on the Apache Software Foundation, please see
 * .
 *
 * +------------------------------------------------------------------------------------------------+
 * | License: http://www.apache.org/licenses/LICENSE-2.0.txt 										|
 * | Author: Yong.Teng  													|
 * | Copyright @ 2013-2022 Buession.com Inc.														|
 * +------------------------------------------------------------------------------------------------+
 */
package com.buession.dao;

/**
 * 分页类
 *
 * @param 
 * 		数据类型
 *
 * @author Yong.Teng
 */
public class Pagination extends com.buession.core.Pagination {

	/**
	 * 偏移量
	 */
	private Integer offset;

	/**
	 * Constructs with default configuration.
	 */
	public Pagination(){
		super();
	}

	/**
	 * Constructs with page and pagesize.
	 *
	 * @param page
	 * 		当前页码
	 * @param pagesize
	 * 		每页大小
	 */
	public Pagination(int page, int pagesize){
		super(page, pagesize);
	}

	/**
	 * Constructs with page, pagesize and totalRecords.
	 *
	 * @param page
	 * 		当前页码
	 * @param pagesize
	 * 		每页大小
	 * @param totalRecords
	 * 		总记录数
	 */
	public Pagination(int page, int pagesize, long totalRecords){
		super(page, pagesize, totalRecords);
	}

	/**
	 * 返回查询偏移量
	 *
	 * @return 查询偏移量
	 */
	public int getOffset(){
		if(offset == null){
			if(getPage() > 1){
				setOffset((getPage() - 1) * getPagesize());
			}else{
				offset = 0;
			}
		}

		return offset;
	}

	/**
	 * 设置查询偏移量
	 *
	 * @param offset
	 * 		查询偏移量
	 */
	public void setOffset(int offset){
		this.offset = Math.max(offset, 0);
	}

}