com.ejlchina.searcher.implement.pagination.PageNumPagination Maven / Gradle / Ivy
package com.ejlchina.searcher.implement.pagination;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ejlchina.searcher.param.SearchParam;
public class PageNumPagination implements Pagination {
protected Logger log = LoggerFactory.getLogger(PageNumPagination.class);
/**
* 开始页
* */
private int startPage = 0;
/**
* 最大条数字段参数名
*/
private String maxParamName = "size";
/**
* 偏移条数字段参数名
*/
private String pageParamName = "page";
/**
* 最大允许查询条数
*/
private int maxAllowedSize = 100;
@Override
public boolean paginate(SearchParam searchParam, String paraName, String paraValue) {
try {
if (maxParamName.equals(paraName)) {
Integer max = Integer.valueOf(paraValue);
if (max > maxAllowedSize) {
max = maxAllowedSize;
}
searchParam.setMax(max);
Long page = searchParam.getPage();
if (page == null) {
return true;
}
long offset = (page - startPage) * max;
if (offset < 0) {
offset = 0;
}
searchParam.setOffset(offset);
return true;
}
if (pageParamName.equals(paraName)) {
Long page = Long.valueOf(paraValue);
searchParam.setPage(page);
Integer max = searchParam.getMax();
if (max == null) {
return true;
}
long offset = (page - startPage) * max;
if (offset < 0) {
offset = 0;
}
searchParam.setOffset(offset);
return true;
}
} catch (Exception e) {
log.error("解析分页参数异常：", e);
return false;
}
return false;
}
@Override
public String getMaxParamName() {
return maxParamName;
}
@Override
public int getStartPage() {
return startPage;
}
public void setMaxParamName(String maxParamName) {
this.maxParamName = maxParamName;
}
public void setPageParamName(String pageParamName) {
this.pageParamName = pageParamName;
}
public void setStartPage(int startPage) {
this.startPage = startPage;
}
public void setMaxAllowedSize(int maxAllowedSize) {
this.maxAllowedSize = maxAllowedSize;
}
}