net.cofcool.chaos.server.data.jpa.support.JpaPage Maven / Gradle / Ivy
/*
* Copyright 2019 cofcool
*
* 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 net.cofcool.chaos.server.data.jpa.support;
import java.io.Serializable;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
/**
* JPA分页模型, 实现Pageable接口
*
* @author CofCool
*
* @see Pageable
* @see org.springframework.data.domain.PageRequest
*/
public class JpaPage implements Pageable, Serializable {
private static final long serialVersionUID = -76703640096945681L;
private final Integer pageNumber;
private final Integer pageSize;
private final Sort sort;
public JpaPage(Integer pageNumber, Integer pageSize) {
this(pageNumber, pageSize, Sort.unsorted());
}
public JpaPage(Integer pageNumber, Integer pageSize, Sort sort) {
this.pageNumber = pageNumber;
this.pageSize = pageSize;
this.sort = sort;
}
@Override
public int getPageNumber() {
return pageNumber;
}
@Override
public int getPageSize() {
return pageSize;
}
@Override
public long getOffset() {
return (long) pageNumber * (long) pageSize;
}
@Override
public Sort getSort() {
return sort;
}
@Override
public Pageable next() {
return new JpaPage(getPageNumber() + 1, getPageSize(), getSort());
}
@Override
public Pageable previousOrFirst() {
return hasPrevious() ? previous() : first();
}
@Override
public Pageable first() {
return new JpaPage(0, getPageSize(), getSort());
}
@Override
public boolean hasPrevious() {
return pageNumber > 0;
}
public JpaPage previous() {
return getPageNumber() == 0 ? this : new JpaPage(getPageNumber() - 1, getPageSize(), getSort());
}
}