com.github.dactiv.orm.core.PageRequest.java Source code

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Here is the source code for com.github.dactiv.orm.core.PageRequest.java

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/*
 * Copyright 2013-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.dactiv.orm.core;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.Assert;

/**
 * ??.
 * @author maurice
 */
public class PageRequest implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * 
     */
    protected int pageNo = 1;

    /**
     * ??
     */
    protected int pageSize = 10;

    /**
     * ?
     */
    protected String orderBy = null;

    /**
     * ??
     * @see Sort
     */
    protected String orderDir = null;

    /**
     * ?.
     */
    protected boolean countTotal = true;

    /**
     * 
     */
    public PageRequest() {
    }

    /**
     * 
     * @param pageNo 
     * @param pageSize ??
     */
    public PageRequest(int pageNo, int pageSize) {
        this.pageNo = pageNo;
        this.pageSize = pageSize;
    }

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

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

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

    /**
     * ??, 10.
     */
    public int getPageSize() {
        return pageSize;
    }

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

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

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

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

    /**
     * ??, .
     */
    public String getOrderDir() {
        return orderDir;
    }

    /**
     * ???.
     * 
     * @param orderDir ?descasc,?','.
     */
    public void setOrderDir(final String orderDir) {
        String lowcaseOrderDir = StringUtils.lowerCase(orderDir);

        //order?
        String[] orderDirs = StringUtils.split(lowcaseOrderDir, ',');

        if (ArrayUtils.isEmpty(orderDirs)) {
            return;
        }

        for (String orderDirStr : orderDirs) {
            if (!StringUtils.equals(Sort.DESC, orderDirStr) && !StringUtils.equals(Sort.ASC, orderDirStr)) {
                throw new IllegalArgumentException("??" + orderDirStr + "??");
            }
        }

        this.orderDir = lowcaseOrderDir;
    }

    /**
     * ??.
     */
    @SuppressWarnings("unchecked")
    public List<Sort> getSort() {
        if (orderBy == null || orderDir == null) {
            return Collections.EMPTY_LIST;
        }
        String[] orderBys = StringUtils.split(orderBy, ',');
        String[] orderDirs = StringUtils.split(orderDir, ',');
        Assert.isTrue(orderBys.length == orderDirs.length,
                "???,????");

        List<Sort> orders = new ArrayList<PageRequest.Sort>();
        for (int i = 0; i < orderBys.length; i++) {
            orders.add(new Sort(orderBys[i], orderDirs[i]));
        }

        return orders;
    }

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

    /**
     * ?.
     */
    public boolean isCountTotal() {
        return countTotal;
    }

    /**
     * ?.
     */
    public void setCountTotal(boolean countTotal) {
        this.countTotal = countTotal;
    }

    /**
     * ?pageNopageSize???, ??0.
     */
    public int getOffset() {
        return ((pageNo - 1) * pageSize);
    }

    /**
     * ?Order By?sql
     * @return String
     */
    public String getOrderSortString() {
        List<Sort> list = this.getSort();
        StringBuffer buffer = new StringBuffer();
        for (Iterator<Sort> it = list.iterator(); it.hasNext();) {
            Sort sort = it.next();
            buffer.append(sort.property + " " + sort.dir).append(",");
        }

        return StringUtils.substringBeforeLast(buffer.toString(), ",");
    }

    /**
     * ??
     * 
     * @author maurice
     *
     */
    public static class Sort {
        public static final String ASC = "asc";
        public static final String DESC = "desc";

        private final String property;
        private final String dir;

        /**
         * 
         * @param property ??
         * @param dir ??
         */
        public Sort(String property, String dir) {
            this.property = property;
            this.dir = dir;
        }

        /**
         * ??
         * @return String
         */
        public String getProperty() {
            return property;
        }

        /**
         * ???
         * 
         * @return String
         */
        public String getDir() {
            return dir;
        }
    }
}