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package cn.wizzer.framework.page;

import org.nutz.dao.pager.Pager;

import java.io.Serializable;

/**
 * 指定偏移量及大小的Pager, 这样就不会受限于原生Pager的offset=(pageNumber-1)*pageSize
 *
 * @author wendal
 */

public class OffsetPager extends Pager implements Serializable {

    private static final long serialVersionUID = -1385308131663113162L;

    protected int offset = -1;

    protected OffsetPager() {
    }

    /**
     * 构建一个指定偏移量及大小的Pager
     *
     * @param offset 偏移量
     * @param size   数据大小
     */
    public OffsetPager(int offset, int size) {
        super();
        this.offset = offset;
        setPageSize(size);
    }

    /**
     * 覆盖超类的计算得到的offset
     */
    public int getOffset() {
        if (offset > -1)
            return offset;
        return super.getOffset();
    }

    public void setOffset(int offset) {
        this.offset = offset;
    }
}