com.github.ibole.infrastructure.common.dto.PaginationData Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of infrastructure-all Show documentation
The all in one project of ibole infrastructure
The newest version!
package com.github.ibole.infrastructure.common.dto;

import java.io.Serializable;

/**
 * POJO representation of pagination.
 *
 */
public class PaginationData implements Serializable {


  private static final long serialVersionUID = 1L;

  /** The number of results per page. */
  private int pageSize;
  private int currentPage;
  private int offset;
  private int totalCount;
  private int countByPage;

  private int totalPages;

  /**
   * Constructor for Pagination Data.
   * 
   * @param pageSize the page size
   * @param currentPage current page
   */
  public PaginationData(int pageSize, int currentPage) {
    if (pageSize == 0) {
      throw new IllegalArgumentException("limit cannot be 0 for pagination.");
    }

    this.pageSize = pageSize;
    this.currentPage = currentPage;
  }


  public int getPageSize() {
    return pageSize;
  }


  /**
   * The current page number this pagination object represents.
   *
   * @return the page number
   */
  public int getPageNumber() {
    if (offset < pageSize || pageSize == 0) {
      return 1;
    }
    return (offset / pageSize) + 1;
  }


  /**
   * The offset for this pagination object. The offset determines what index (0 index) to start
   * retrieving results from.
   *
   * @return the offset
   */
  public int getOffset() {
    return (currentPage - 1) * pageSize;
  }


  /**
   * Creates a new pagination object representing the next page.
   * 
   * @return new pagination object with offset shifted by offset+limit
   */
  public PaginationData getNext() {
    PaginationData page = this;
    page.setCurrentPage(this.currentPage + 1);
    return page;
  }

  // public PaginationData getNext() {
  // return new PaginationData(offset + pageSize, pageSize);
  // }

  /**
   * Creates a new pagination object representing the previous page.
   *
   * @return new pagination object with offset shifted by offset-limit
   */
  public PaginationData getPrevious() {
    PaginationData page = this;
    page.setCurrentPage(this.currentPage - 1);
    return page;
  }


  // public PaginationData getPrevious() {
  // if (pageSize >= offset) {
  // return new PaginationData(0, pageSize);
  // } else {
  // return new PaginationData(offset - pageSize, pageSize);
  // }
  // }


  public int getCurrentPage() {
    return currentPage;
  }


  public void setCurrentPage(int currentPage) {
    this.currentPage = currentPage;
  }


  public int getTotalCount() {
    return totalCount;
  }


  public void setTotalCount(int totalCount) {
    this.totalCount = totalCount;
  }

  /**
   * Get total pages.
   * 
   * @return the total pages
   */
  public int getTotalPages() {

    Integer totalPages =
        Integer.valueOf((int) (Math.ceil(Integer.valueOf(totalCount).doubleValue() / pageSize)));
    return totalPages;
  }


  public int getCountByPage() {
    return countByPage;
  }


  public void setCountByPage(int countByPage) {
    this.countByPage = countByPage;
  }


  public void setTotalPages(int totalPages) {
    this.totalPages = totalPages;
  }



}