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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2017 [email protected]
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.github.pagehelper.util;
import com.github.pagehelper.IPage;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageException;
import com.jn.langx.util.Strings;
import org.apache.ibatis.reflection.MetaObject;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
/**
* 分页参数对象工具类
*
* @author liuzh
*/
public class PageObjectUtil {
//request获取方法
protected static Boolean hasRequest;
protected static Class requestClass;
protected static Method getParameterMap;
protected final static Map PARAMS = new HashMap(6, 1);
static {
try {
requestClass = Class.forName("javax.servlet.ServletRequest");
getParameterMap = requestClass.getMethod("getParameterMap", new Class[]{});
hasRequest = true;
} catch (Throwable e) {
hasRequest = false;
}
PARAMS.put("pageNum", "pageNum");
PARAMS.put("pageSize", "pageSize");
PARAMS.put("count", "countSql");
PARAMS.put("orderBy", "orderBy");
PARAMS.put("reasonable", "reasonable");
PARAMS.put("pageSizeZero", "pageSizeZero");
}
/**
* 对象中获取分页参数
*
* @param params
* @return
*/
public static Page getPageFromObject(Object params, boolean required) {
if (params == null) {
throw new PageException("无法获取分页查询参数!");
}
if (params instanceof IPage) {
IPage pageParams = (IPage) params;
Page page = null;
if (pageParams.getPageNum() != null && pageParams.getPageSize() != null) {
page = new Page(pageParams.getPageNum(), pageParams.getPageSize());
}
if (Strings.isNotEmpty(pageParams.getOrderBy())) {
if (page != null) {
page.setOrderBy(pageParams.getOrderBy());
} else {
page = new Page();
page.setOrderBy(pageParams.getOrderBy());
page.setOrderByOnly(true);
}
}
return page;
}
int pageNum;
int pageSize;
MetaObject paramsObject = null;
if (hasRequest && requestClass.isAssignableFrom(params.getClass())) {
try {
paramsObject = MetaObjectUtil.forObject(getParameterMap.invoke(params, new Object[]{}));
} catch (Exception e) {
//忽略
}
} else {
paramsObject = MetaObjectUtil.forObject(params);
}
if (paramsObject == null) {
throw new PageException("分页查询参数处理失败!");
}
Object orderBy = getParamValue(paramsObject, "orderBy", false);
boolean hasOrderBy = false;
if (orderBy != null && orderBy.toString().length() > 0) {
hasOrderBy = true;
}
try {
Object _pageNum = getParamValue(paramsObject, "pageNum", required);
Object _pageSize = getParamValue(paramsObject, "pageSize", required);
if (_pageNum == null || _pageSize == null) {
if (hasOrderBy) {
Page page = new Page();
page.setOrderBy(orderBy.toString());
page.setOrderByOnly(true);
return page;
}
return null;
}
pageNum = Integer.parseInt(String.valueOf(_pageNum));
pageSize = Integer.parseInt(String.valueOf(_pageSize));
} catch (NumberFormatException e) {
throw new PageException("分页参数不是合法的数字类型!", e);
}
Page page = new Page(pageNum, pageSize);
//count查询
Object _count = getParamValue(paramsObject, "count", false);
if (_count != null) {
page.setCount(Boolean.valueOf(String.valueOf(_count)));
}
//排序
if (hasOrderBy) {
page.setOrderBy(orderBy.toString());
}
//分页合理化
Object reasonable = getParamValue(paramsObject, "reasonable", false);
if (reasonable != null) {
page.setReasonable(Boolean.valueOf(String.valueOf(reasonable)));
}
//查询全部
Object pageSizeZero = getParamValue(paramsObject, "pageSizeZero", false);
if (pageSizeZero != null) {
page.setPageSizeZero(Boolean.valueOf(String.valueOf(pageSizeZero)));
}
return page;
}
/**
* 从对象中取参数
*
* @param paramsObject
* @param paramName
* @param required
* @return
*/
protected static Object getParamValue(MetaObject paramsObject, String paramName, boolean required) {
Object value = null;
if (paramsObject.hasGetter(PARAMS.get(paramName))) {
value = paramsObject.getValue(PARAMS.get(paramName));
}
if (value != null && value.getClass().isArray()) {
Object[] values = (Object[]) value;
if (values.length == 0) {
value = null;
} else {
value = values[0];
}
}
if (required && value == null) {
throw new PageException("分页查询缺少必要的参数:" + PARAMS.get(paramName));
}
return value;
}
public static void setParams(String params) {
if (Strings.isNotEmpty(params)) {
String[] ps = params.split("[;|,|&]");
for (String s : ps) {
String[] ss = s.split("[=|:]");
if (ss.length == 2) {
PARAMS.put(ss[0], ss[1]);
}
}
}
}
}