com.github.aly8246.collectionutil.util.CollectionUtil Maven / Gradle / Ivy

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Collection Util is a mybatis plug-in designed to solve the problem of N + 1 in mysql. When you use Mysql to query linked tables and pages, there will be n + 1 problem. This plug-in can help you!

There is a newer version: 1.1.1.RELEASE

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package com.github.aly8246.collectionutil.util;

import com.github.aly8246.collectionutil.core.PageInterface;
import com.github.aly8246.collectionutil.main.CollectionInterceptor;
import com.github.aly8246.collectionutil.result.PageResult;

import java.util.List;

/**
 * 为用户提供获取分页数据的方法
 *
 * @author 南有乔木
 * @version v.1.0.2
 * @see PageInterface
 * @see CollectionInterceptor
 */
public class CollectionUtil extends CollectionInterceptor {

private static void clear() {
	pageResultThreadLocal.set(null);
}

private static PageResult basePageResult() {
	PageResult pageResult = CollectionInterceptor.pageResultThreadLocal.get();
	clear();
	if (pageResult == null) return new PageResult();
	return pageResult;
}

/**
 * 从本地线程中获取分页数据
 *
 * @return CollectionUtil工具的原始分页结果
 * @author 南有乔木
 */
public static PageResult get() {
	return basePageResult();
}

/**
 * 传递一个参数只是为了解决强迫症患者的问题，放进来实际上没有任何意义，只是代码可以放成一行而已
 *
 * @param o 可以为任意
 * @return CollectionUtil工具的原始分页结果
 * @author 南有乔木
 */
public static PageResult get(Object o) {
	return get();
}

/**
 * 为方便前端使用，将返回结果打包成Mybatis Plus的返回结果，以便无缝切换CollectionUtil和Mybatis Plus分页，各司其职
 *
 * @return Mybatis Plus的返回结果
 * @author 南有乔木
 */
public static IPage packMPResult() {
	PageResult pageResult = basePageResult();
	clear();
	return new IPage() {
		@Override
		public List getRecords() {
			return pageResult.getData();
		}
		
		@Override
		public IPage setRecords(List records) {
			return null;
		}
		
		@Override
		public long getTotal() {
			return pageResult.getTotal();
		}
		
		@Override
		public IPage setTotal(long total) {
			return null;
		}
		
		@Override
		public long getSize() {
			return pageResult.getPageSize();
		}
		
		@Override
		public IPage setSize(long size) {
			return null;
		}
		
		@Override
		public long getCurrent() {
			return pageResult.getPage();
		}
		
		@Override
		public IPage setCurrent(long current) {
			return null;
		}
	};
}

/**
 * 传递一个参数只是为了解决强迫症患者的问题，放进来实际上没有任何意义，只是代码可以放成一行而已
 *
 * @param o 可以为任意
 * @return CollectionUtil工具的原始分页结果
 * @author 南有乔木
 */
public static IPage packMPResult(Object o) {
	return packMPResult();
}


}