package org.util;

//分頁顯示
public class Pager {

 private int currentPage;     //當前頁
 private int pageSize = 5;    //每頁顯示的記錄數
 private int  totalSize;    //總記錄數
 private int totalPage;    //總頁數
 

 private boolean hasFirst;    //是否有首頁
 private boolean hasPrevious;    // 是否有上一頁
 private boolean hasNext;    // 是否有下一頁
 private boolean hasLast;    // 是否有尾頁

/**構造函數必須傳入兩個參數當前頁和總記錄數
根據當前頁可以判斷是否有上一頁下一頁等等,
根據總記錄數可以算出總頁數*/
 public Pager(int currentPage,int totalSize){
  
  this.currentPage = currentPage;
  this.totalSize = totalSize;
 }
 
 public int getCurrentPage() {
  return currentPage;
 }
 public void setCurrentPage(int currentPage) {
  this.currentPage = currentPage;
 }
 public boolean isHasFirst() {
  
  if(currentPage == 1)
   return false;
  return true;
 }
 public void setHasFirst(boolean hasFirst) {
  this.hasFirst = hasFirst;
 }
 public boolean isHasLast() {
  
  if(currentPage == getTotalPage())
   return false;
  return true;
 }
 public void setHasLast(boolean hasLast) {
  this.hasLast = hasLast;
 }
 public boolean isHasNext() {
  
  if(isHasLast())
   return true;
  return false;
 }
 public void setHasNext(boolean hasNext) {
  this.hasNext = hasNext;
 }
 public boolean isHasPrevious() {
  
  if(isHasFirst())
   return true;
  return false;
 }
 public void setHasPrevious(boolean hasPrevious) {
  this.hasPrevious = hasPrevious;
 }
 public int getPageSize() {
  return pageSize;
 }
 public void setPageSize(int pageSize) {
  this.pageSize = pageSize;
 }
 public int getTotalPage() {
  //計算出總頁數
  totalPage = totalSize / pageSize;
  if(totalSize % pageSize != 0)
   totalPage++;
  return totalPage;
 }
 public void setTotalPage(int totalPage) {
  this.totalPage = totalPage;
 }
 public int getTotalSize() {
  return totalSize;
 }
 public void setTotalSize(int totalSize) {
  this.totalSize = totalSize;
 }
}