package com.jdroid.javaweb.search;
import com.jdroid.java.exception.UnexpectedException;
public class Pager {
private final static Integer DEFAULT_PAGE = 1;
private final static Integer DEFAULT_PAGE_SIZE = 25;
private Integer size;
private Integer page;
/**
* @param page
* @param size
*/
public Pager(Integer page, Integer size) {
this.page = page != null ? page : DEFAULT_PAGE;
this.size = size != null ? size : DEFAULT_PAGE_SIZE;
if (this.page < 1) {
throw new UnexpectedException("Wrong page [" + page + "]");
}
if (this.size < 1) {
throw new UnexpectedException("Wrong page size [" + size + "]");
}
}
/**
* @return the page
*/
public Integer getPage() {
return page;
}
/**
* @return the size
*/
public Integer getSize() {
return size;
}
public Integer getOffset() {
return (page - 1) * size;
}
public Integer getMaxPages(Long total) {
return (int)Math.ceil((total * 1.0) / size);
}
public Boolean isLastPage(Long total) {
return getMaxPages(total).equals(page);
}
}