PageHelper源码(一) :PageInfo

客官°小女子只卖身不卖艺 2022-05-14 11:13 235阅读 0赞

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package com.github.pagehelper;
    
    import java.io.Serializable;
    import java.util.Collection;
    import java.util.List;
    
    public class PageInfo<T> implements Serializable {
        private static final long serialVersionUID = 1L;
        private int pageNum;
        private int pageSize;
        private int size;
        private String orderBy;
        private int startRow;
        private int endRow;
        private long total;
        private int pages;
        private List<T> list;
        private int firstPage;
        private int prePage;
        private int nextPage;
        private int lastPage;
        private boolean isFirstPage;
        private boolean isLastPage;
        private boolean hasPreviousPage;
        private boolean hasNextPage;
        private int navigatePages;
        private int[] navigatepageNums;
    
        public PageInfo() {
            this.isFirstPage = false;
            this.isLastPage = false;
            this.hasPreviousPage = false;
            this.hasNextPage = false;
        }
    
        public PageInfo(List<T> list) {
            this(list, 8);
        }
    
        public PageInfo(List<T> list, int navigatePages) {
            this.isFirstPage = false;
            this.isLastPage = false;
            this.hasPreviousPage = false;
            this.hasNextPage = false;
            if (list instanceof Page) {
                Page page = (Page)list;
                this.pageNum = page.getPageNum();
                this.pageSize = page.getPageSize();
                this.orderBy = page.getOrderBy();
                this.pages = page.getPages();
                this.list = page;
                this.size = page.size();
                this.total = page.getTotal();
                if (this.size == 0) {
                    this.startRow = 0;
                    this.endRow = 0;
                } else {
                    this.startRow = page.getStartRow() + 1;
                    this.endRow = this.startRow - 1 + this.size;
                }
            } else if (list instanceof Collection) {
                this.pageNum = 1;
                this.pageSize = list.size();
                this.pages = 1;
                this.list = list;
                this.size = list.size();
                this.total = (long)list.size();
                this.startRow = 0;
                this.endRow = list.size() > 0 ? list.size() - 1 : 0;
            }
    
            if (list instanceof Collection) {
                this.navigatePages = navigatePages;
                this.calcNavigatepageNums();
                this.calcPage();
                this.judgePageBoudary();
            }
    
        }
    
        private void calcNavigatepageNums() {
            int i;
            if (this.pages <= this.navigatePages) {
                this.navigatepageNums = new int[this.pages];
    
                for(i = 0; i < this.pages; ++i) {
                    this.navigatepageNums[i] = i + 1;
                }
            } else {
                this.navigatepageNums = new int[this.navigatePages];
                i = this.pageNum - this.navigatePages / 2;
                int endNum = this.pageNum + this.navigatePages / 2;
                int i;
                if (i < 1) {
                    i = 1;
    
                    for(i = 0; i < this.navigatePages; ++i) {
                        this.navigatepageNums[i] = i++;
                    }
                } else if (endNum > this.pages) {
                    endNum = this.pages;
    
                    for(i = this.navigatePages - 1; i >= 0; --i) {
                        this.navigatepageNums[i] = endNum--;
                    }
                } else {
                    for(i = 0; i < this.navigatePages; ++i) {
                        this.navigatepageNums[i] = i++;
                    }
                }
            }
    
        }
    
        private void calcPage() {
            if (this.navigatepageNums != null && this.navigatepageNums.length > 0) {
                this.firstPage = this.navigatepageNums[0];
                this.lastPage = this.navigatepageNums[this.navigatepageNums.length - 1];
                if (this.pageNum > 1) {
                    this.prePage = this.pageNum - 1;
                }
    
                if (this.pageNum < this.pages) {
                    this.nextPage = this.pageNum + 1;
                }
            }
    
        }
    
        private void judgePageBoudary() {
            this.isFirstPage = this.pageNum == 1;
            this.isLastPage = this.pageNum == this.pages;
            this.hasPreviousPage = this.pageNum > 1;
            this.hasNextPage = this.pageNum < this.pages;
        }
    
        public int getPageNum() {
            return this.pageNum;
        }
    
        public void setPageNum(int pageNum) {
            this.pageNum = pageNum;
        }
    
        public int getPageSize() {
            return this.pageSize;
        }
    
        public void setPageSize(int pageSize) {
            this.pageSize = pageSize;
        }
    
        public int getSize() {
            return this.size;
        }
    
        public void setSize(int size) {
            this.size = size;
        }
    
        public String getOrderBy() {
            return this.orderBy;
        }
    
        public void setOrderBy(String orderBy) {
            this.orderBy = orderBy;
        }
    
        public int getStartRow() {
            return this.startRow;
        }
    
        public void setStartRow(int startRow) {
            this.startRow = startRow;
        }
    
        public int getEndRow() {
            return this.endRow;
        }
    
        public void setEndRow(int endRow) {
            this.endRow = endRow;
        }
    
        public long getTotal() {
            return this.total;
        }
    
        public void setTotal(long total) {
            this.total = total;
        }
    
        public int getPages() {
            return this.pages;
        }
    
        public void setPages(int pages) {
            this.pages = pages;
        }
    
        public List<T> getList() {
            return this.list;
        }
    
        public void setList(List<T> list) {
            this.list = list;
        }
    
        public int getFirstPage() {
            return this.firstPage;
        }
    
        public void setFirstPage(int firstPage) {
            this.firstPage = firstPage;
        }
    
        public int getPrePage() {
            return this.prePage;
        }
    
        public void setPrePage(int prePage) {
            this.prePage = prePage;
        }
    
        public int getNextPage() {
            return this.nextPage;
        }
    
        public void setNextPage(int nextPage) {
            this.nextPage = nextPage;
        }
    
        public int getLastPage() {
            return this.lastPage;
        }
    
        public void setLastPage(int lastPage) {
            this.lastPage = lastPage;
        }
    
        public boolean isIsFirstPage() {
            return this.isFirstPage;
        }
    
        public void setIsFirstPage(boolean isFirstPage) {
            this.isFirstPage = isFirstPage;
        }
    
        public boolean isIsLastPage() {
            return this.isLastPage;
        }
    
        public void setIsLastPage(boolean isLastPage) {
            this.isLastPage = isLastPage;
        }
    
        public boolean isHasPreviousPage() {
            return this.hasPreviousPage;
        }
    
        public void setHasPreviousPage(boolean hasPreviousPage) {
            this.hasPreviousPage = hasPreviousPage;
        }
    
        public boolean isHasNextPage() {
            return this.hasNextPage;
        }
    
        public void setHasNextPage(boolean hasNextPage) {
            this.hasNextPage = hasNextPage;
        }
    
        public int getNavigatePages() {
            return this.navigatePages;
        }
    
        public void setNavigatePages(int navigatePages) {
            this.navigatePages = navigatePages;
        }
    
        public int[] getNavigatepageNums() {
            return this.navigatepageNums;
        }
    
        public void setNavigatepageNums(int[] navigatepageNums) {
            this.navigatepageNums = navigatepageNums;
        }
    
        public String toString() {
            StringBuffer sb = new StringBuffer("PageInfo{");
            sb.append("pageNum=").append(this.pageNum);
            sb.append(", pageSize=").append(this.pageSize);
            sb.append(", size=").append(this.size);
            sb.append(", startRow=").append(this.startRow);
            sb.append(", endRow=").append(this.endRow);
            sb.append(", total=").append(this.total);
            sb.append(", pages=").append(this.pages);
            sb.append(", list=").append(this.list);
            sb.append(", firstPage=").append(this.firstPage);
            sb.append(", prePage=").append(this.prePage);
            sb.append(", nextPage=").append(this.nextPage);
            sb.append(", lastPage=").append(this.lastPage);
            sb.append(", isFirstPage=").append(this.isFirstPage);
            sb.append(", isLastPage=").append(this.isLastPage);
            sb.append(", hasPreviousPage=").append(this.hasPreviousPage);
            sb.append(", hasNextPage=").append(this.hasNextPage);
            sb.append(", navigatePages=").append(this.navigatePages);
            sb.append(", navigatepageNums=");
            if (this.navigatepageNums == null) {
                sb.append("null");
            } else {
                sb.append('[');
    
                for(int i = 0; i < this.navigatepageNums.length; ++i) {
                    sb.append(i == 0 ? "" : ", ").append(this.navigatepageNums[i]);
                }
    
                sb.append(']');
            }
    
            sb.append('}');
            return sb.toString();
        }
    }