com.manpowergroup.cn.core.orm.Page.java Source code

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Here is the source code for com.manpowergroup.cn.core.orm.Page.java

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/**
 * Copyright (c) 2005-2009 springside.org.cn Licensed under the Apache License,
 * Version 2.0 (the "License"); $Id: Page.java,v 1.1 2010/07/15 01:29:10 alan
 * Exp $
 */
package com.manpowergroup.cn.core.orm;

import java.util.Collections;
import java.util.List;

import org.apache.commons.lang.StringUtils;

/**
 * ORM???.
 * ???1.
 * 
 * @param <T> Page.
 * 
 * @author calvin
 */
public class Page<T> {
    // ?? //
    public static final String ASC = "asc";
    public static final String DESC = "desc";
    public static final int PAGESIZE_20 = 20;
    public static final int PAGESIZE_10 = 10;
    public static final int PAGESIZE_15 = 15;
    public static final int PAGESIZE_50 = 50;
    public static final int PAGENO_1 = 1;

    //? //
    protected int pageNo = 1;
    protected int pageSize = 1;
    protected String orderBy = null;
    protected String order = null;
    protected boolean autoCount = true;

    // //
    protected List<T> result = Collections.emptyList();
    protected long totalCount = -1;

    //  //

    public Page() {
    }

    public Page(final int pageSize) {
        setPageSize(pageSize);
    }

    public Page(final int pageSize, final boolean autoCount) {
        setPageSize(pageSize);
        setAutoCount(autoCount);
    }

    // ? //

    /**
     * ??,??1,1.
     */
    public int getPageNo() {
        return pageNo;
    }

    /**
     * ??,??1,11
     */
    public void setPageNo(final int pageNo) {
        this.pageNo = pageNo;

        if (pageNo < 1) {
            this.pageNo = 1;
        }
    }

    /**
     * ??,1.
     */
    public int getPageSize() {
        return pageSize;
    }

    /**
     * ??,11.
     */
    public void setPageSize(final int pageSize) {
        this.pageSize = pageSize;

        if (pageSize < 1) {
            this.pageSize = 1;
        }
    }

    /**
     * ?pageNopageSize???,??1.
     */
    public int getFirst() {
        return ((pageNo - 1) * pageSize) + 1;
    }

    /**
     * ?,.?','.
     */
    public String getOrderBy() {
        return orderBy;
    }

    /**
     * ?,?','.
     */
    public void setOrderBy(final String orderBy) {
        this.orderBy = orderBy;
    }

    /**
     * ??,.
     */
    public boolean isOrderBySetted() {
        return (StringUtils.isNotBlank(orderBy) && StringUtils.isNotBlank(order));
    }

    /**
     * ??.
     */
    public String getOrder() {
        return order;
    }

    /**
     * ???.
     * 
     * @param order ?descasc,?','.
     */
    public void setOrder(final String order) {
        //order?
        String[] orders = StringUtils.split(StringUtils.lowerCase(order), ',');
        for (String orderStr : orders) {
            if (!StringUtils.equals(DESC, orderStr) && !StringUtils.equals(ASC, orderStr))
                throw new IllegalArgumentException("??" + orderStr + "??");
        }

        this.order = StringUtils.lowerCase(order);
    }

    /**
     * ??count?, false.
     */
    public boolean isAutoCount() {
        return autoCount;
    }

    /**
     * ??count?.
     */
    public void setAutoCount(final boolean autoCount) {
        this.autoCount = autoCount;
    }

    //  //

    /**
     * ?.
     */
    public List<T> getResult() {
        return result;
    }

    public void setResult(final List<T> result) {
        this.result = result;
    }

    /**
     * ?, -1.
     */
    public long getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(final long totalCount) {
        this.totalCount = totalCount;

    }

    /**
     * ?pageSizetotalCount, -1.
     */
    public long getTotalPages() {
        if (totalCount < 0)
            return -1;

        long count = totalCount / pageSize;
        if (totalCount % pageSize > 0) {
            count++;
        }
        return count;
    }

    /**
     * ?.
     */
    public boolean isHasNext() {
        return (pageNo + 1 <= getTotalPages());
    }

    /**
     * ??, ??1.
     * ????.
     */
    public int getNextPage() {
        if (isHasNext())
            return pageNo + 1;
        else
            return pageNo;
    }

    /**
     * ?.
     */
    public boolean isHasPre() {
        return (pageNo - 1 >= 1);
    }

    /**
     * ??, ??1.
     * ???.
     */
    public int getPrePage() {
        if (isHasPre())
            return pageNo - 1;
        else
            return pageNo;
    }
}