package com.jtgh.yjpt.common;

import java.io.Serializable;

import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;

/**
 * 分页处理对象，单字段排序
 * 
 * @author 袁晓冬
 * 
 */
public class SinglePageRequest implements Pageable, Serializable {
	/** serialVersionUID */
	private static final long serialVersionUID = -8842412227660495154L;
	/** 当前页码 */
	private int page;
	/** 每页条数 */
	private int size;
	/** 排序方向 */
	private String direction;
	/** 排序字段 */
	private String sortField;

	public SinglePageRequest() {

	}

	public SinglePageRequest(int page, int size, String direction,
			String sortField) {
		this.page = page;
		this.size = size;
		this.direction = direction;
		this.sortField = sortField;
	}

	@Override
	public Pageable first() {
		return new SinglePageRequest(0, size, direction, sortField);
	}

	public String getDirection() {
		return direction;
	}

	@Override
	public int getOffset() {
		return page * size;
	}

	public int getPage() {
		return page;
	}

	@Override
	public int getPageNumber() {
		return page;
	}

	@Override
	public int getPageSize() {
		return size;
	}

	public int getSize() {
		return size;
	}

	@Override
	public Sort getSort() {
		return new Sort(Direction.fromString(direction),
				new String[] { sortField });
	}

	public String getSortField() {
		return sortField;
	}

	@Override
	public boolean hasPrevious() {
		return page > 0;
	}

	@Override
	public Pageable next() {
		return new PageRequest(page + 1, size, getSort());
	}

	@Override
	public Pageable previousOrFirst() {
		return hasPrevious() ? new PageRequest(page - 1, size, getSort())
				: this;
	}

	public void setDirection(String direction) {
		this.direction = direction;
	}

	public void setPage(int page) {
		this.page = page;
	}

	public void setSize(int size) {
		this.size = size;
	}

	public void setSortField(String sortField) {
		this.sortField = sortField;
	}

	@Override
	public String toString() {
		return "SinglePageRequest [page=" + page + ", size=" + size
				+ ", direction=" + direction + ", sortField=" + sortField + "]";
	}
}