forked from plusone/plusone-commons
69 lines
2.0 KiB
Java
69 lines
2.0 KiB
Java
/*
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* Copyright 2022-2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package xyz.zhouxy.plusone.commons.util;
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import javax.annotation.Nullable;
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import xyz.zhouxy.plusone.commons.annotation.StaticFactoryMethod;
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/**
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* PageInfo
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*
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* <p>
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* 推荐的实现是，请求处理方法用两个 RequestParam 分别接收请求中的 pageNumber 和 size，
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* 应用服务使用 {@link PagingParams#of(Long pageNumber, Integer size)} 构建 PagingParams 对象,
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* 用于查询数据库。
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* </p>
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*
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* @author <a href="https://gitee.com/zhouxy108">ZhouXY</a>
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*/
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public class PagingParams {
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private final long pageNumber;
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private final int size;
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private final long offset;
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private PagingParams(long pageNumber, int size) {
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this.pageNumber = pageNumber;
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this.size = size;
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this.offset = (pageNumber - 1) * size;
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}
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@StaticFactoryMethod(PagingParams.class)
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public static PagingParams of(@Nullable Long pageNumber, @Nullable Integer size) {
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pageNumber = pageNumber == null ? 1 : pageNumber;
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size = size == null ? 15 : size;
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return new PagingParams(pageNumber, size);
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}
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public long getPageNumber() {
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return pageNumber;
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}
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public int getSize() {
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return size;
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}
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public long getOffset() {
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return offset;
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}
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@Override
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public String toString() {
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return "PageInfo [pageNumber=" + pageNumber + ", size=" + size + "]";
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}
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}
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