com.jkali.client.entity.Page.java Source code

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Here is the source code for com.jkali.client.entity.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 
 */
package com.jkali.client.entity;

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

import org.apache.commons.lang.StringUtils;

import com.google.common.collect.Lists;

/**
 * ORM???. ???1.
 * 
 * @param <T>
 *            Page.
 * 
 * @author paul
 */
public class Page<T> implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    // -- ?? --//
    public static final String ASC = "asc";
    public static final String DESC = "desc";

    // -- ? --//
    // 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;

    // jqGrid json// --  --//
    protected int page = 1; // like pageNo
    protected int total = 1; // total page
    protected int pageSize = 1;// like pageSize
    protected long records = -1; // like totalCount

    protected List<T> rows = Lists.newArrayList();

    // -- ? --//
    /**
     * ??,??1,1.
     */
    public int getPage() {
        return page;
    }

    /**
     * ??,??1,11.
     */
    public void setPage(int page) {
        this.page = page;

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

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        if (total < 0) {
            this.total = -1;
        }

        long count = this.records / pageSize;
        if (this.records % pageSize > 0) {
            count++;
        }
        this.total = (int) count;
    }

    /**
     * ?, -1.
     */
    public long getRecords() {
        return records;
    }

    public void setRecords(long records) {
        this.records = records;
        setTotal(1);

    }

    // --  --//
    public Page() {
    }

    public Page(int pageSize) {
        this.pageSize = pageSize;
    }

    public Page<T> pageNo(final int thePageNo) {
        setPage(thePageNo);
        return this;
    }

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

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

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

    }

    public Page<T> pageSize(final int thePageSize) {
        setPageSize(thePageSize);
        return this;
    }

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

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

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

    public Page<T> orderBy(final String theOrderBy) {
        setOrderBy(theOrderBy);
        return this;
    }

    /**
     * ??.
     */
    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);
    }

    public Page<T> order(final String theOrder) {
        setOrder(theOrder);
        return this;
    }

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

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

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

    public Page<T> autoCount(final boolean theAutoCount) {
        setAutoCount(theAutoCount);
        return this;
    }

    // --  --//

    /**
     * ?.
     */
    public List<T> getRows() {
        return rows;
    }

    /**
     * .
     */
    public void setRows(final List<T> rows) {
        this.rows = rows;
    }

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

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

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

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