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package com.jquicker.model;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import com.jquicker.commons.util.JsonUtils;

/**
 * 分页对象Model
 * @param 
 * @author OL
 */
public class Pager implements Serializable {
	
	private static final long serialVersionUID = -2007702922116505685L;
	
	/**
	 * 当前页第一条数据的下标(从0开始计数)
	 */
	private int offset = 0;
	/**
	 * 当前页号
	 */
	private int pageIndex = 1;
	/**
	 * 每一页包含的记录数
	 */
	private int pageSize = 10; 
	/**
	 * 总记录数
	 */
	private long totalSize; 
	/**
	 * 总页数
	 */
	private long totalPage;

	private List records = new ArrayList();

	public Pager() {
		super();
	}
	
	/**
	 * 
	 * @param totalSize
	 * @param pageSize
	 *
	 * @author OL
	 */
	public Pager(int offset, int pageSize) {
		super();
		this.offset = offset;
		this.pageSize = pageSize;
	}
	
	public Pager(int offset, int pageSize, long totalSize, List records) {
		super();
		this.offset = offset;
		this.pageSize = pageSize;
		this.totalSize = totalSize;
		this.records = records;
	}

	public int getOffset() {
		return offset == -1 ? pageSize * (pageIndex - 1) : offset;
	}

	public void setOffset(int offset) {
		this.offset = offset;
	}
	
	public int getPageIndex() {
		return pageIndex == -1 ? (offset + pageSize) / pageSize : pageIndex;
	}

	public void setPageIndex(int pageIndex) {
		this.pageIndex = pageIndex > 0 ? pageIndex : 1;
	}
	
	public int getPageSize() {
		return pageSize > 0 ? pageSize : 10;
	}

	public void setPageSize(int pageSize) {
		this.pageSize = pageSize > 0 ? pageSize : 10;
	}

	public long getTotalSize() {
		return totalSize;
	}
	
	public void setTotalSize(long totalSize) {
		this.totalSize = totalSize;
	}

	public long getTotalPage() {
		totalPage = (totalSize + pageSize - 1) / pageSize;
		return totalPage;
	}

	public void setTotalPage(long totalPage) {
		this.totalPage = totalPage;
	}
	
	public List getRecords() {
		return records;
	}

	public void setRecords(List records) {
		this.records = records;
	}
	
	@Override
	public String toString() {
		return JsonUtils.toJsonString(this);
	}
}