Package org.ametys.web.frontoffice.search.requesttime.pagination

Class Pagination

java.lang.Object

org.ametys.web.frontoffice.search.requesttime.pagination.Pagination

public final class Pagination
extends Object

The representation of a parameterized pagination (with params SearchService.PARAM_NAME_RESULTS_PER_PAGE and SearchService.PARAM_NAME_MAX_RESULTS) in a search service, and a fixed page index, providing convenient methods to retrieve counts and indexes.

Field Summary

Fields

Modifier and Type	Field	Description
private int	_pageIndex
private Optional<Integer>	_paramMaxResults
private Optional<Integer>	_paramResultsPerPage

Constructor Summary

Constructors

Constructor	Description
Pagination(int pageIndex, Optional<Integer> paramResultsPerPage, Optional<Integer> paramMaxResults)	Builds a pagination

Method Summary

Modifier and Type	Method	Description
private int	_currentNumberOfDocs(int totalHits)
private int	_currentStartDocIndex(int resultsPerPage)
private static int	_endDocExclusiveIndex(int startDocIndex, int resultsPerPage)
private static int	_endDocInclusiveIndex(int startDocIndex, int resultsPerPage)
int	currentEndDocExclusiveIndex(int totalHits)	Gets the absolute index for the ending document in the current state (i.e.
int	currentMaxNumberOfDocs()	Gets the maximum number of documents allowed in the current page For instance: let's say the currentPageIndex() is 1 (so currentStartDocIndex() is 0) and there are 3 results per page, then the page has the capacity for potential results [0,1,2] and this methods returns 3.
int	currentPageIndex()	Gets the current page index.
int	currentStartDocIndex()	Gets the absolute index for the starting document in the current state (i.e.
int	numberOfPages(int totalHits)	Given the number of total hits, gets the number of pages

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

_pageIndex

private int _pageIndex

_paramResultsPerPage

private Optional<Integer> _paramResultsPerPage

_paramMaxResults

private Optional<Integer> _paramMaxResults

Constructor Detail

Pagination

public Pagination(int pageIndex,
                  Optional<Integer> paramResultsPerPage,
                  Optional<Integer> paramMaxResults)

Builds a pagination

Parameters:

pageIndex - The current page index. Must be greater or equal to 1

paramResultsPerPage - The (optional) maximum number of allowed results for one page

paramMaxResults - The (optional) maximum number of allowed results overall

Method Detail

currentPageIndex

public int currentPageIndex()

Gets the current page index.
The page index is on final user format, i.e. that the first index is 1 (not 0), etc.

Returns:

the current page index

currentStartDocIndex

public int currentStartDocIndex()

Gets the absolute index for the starting document in the current state (i.e. current page).
Unlike currentPageIndex(), the first index is 0.
For instance, if currentPageIndex() is 1, then it will always return 0.
For instance, if currentPageIndex() is 5 and there are 3 results per page, it will return 12 (because page 1 holds results [0,1,2], page 2 holds results [3,4,5] and so on, and page 5 holds results [12,13,14]).

Returns:

the index for the starting document

_currentStartDocIndex

private int _currentStartDocIndex(int resultsPerPage)

currentEndDocExclusiveIndex

public int currentEndDocExclusiveIndex(int totalHits)

Gets the absolute index for the ending document in the current state (i.e. current page).
For not breaking old expected indexes, this method returns the integer just after the one of the last doc (and thus this integer is not reached in current page). That's why it is called "exclusive".
For instance:

• let's say the currentPageIndex() is 1 (so currentStartDocIndex() is 0) and there are 3 results per page, and totalHits=100, then the page holds results [0,1,2] and this methods returns 3.
• let's say the currentPageIndex() is 5 (so currentStartDocIndex() is 12) and there are 3 results per page, and totalHits=100, then the page holds results [12,13,14] and this methods returns 15.
• let's say the currentPageIndex() is 5 (so currentStartDocIndex() is 12) and there are 3 results per page, and totalHits=13, then the page holds results [12] and this methods returns 13.
• let's say the currentPageIndex() is 5 (so currentStartDocIndex() is 12) and there are 3 results per page and there are 14 max results, and totalHits=100, then the page holds results [12,13] and this methods returns 14.

Parameters:

totalHits - the number of total hits

Returns:

the (exclusive) index for the ending document

_currentNumberOfDocs

private int _currentNumberOfDocs(int totalHits)

currentMaxNumberOfDocs

public int currentMaxNumberOfDocs()

Gets the maximum number of documents allowed in the current page
For instance:

• let's say the currentPageIndex() is 1 (so currentStartDocIndex() is 0) and there are 3 results per page, then the page has the capacity for potential results [0,1,2] and this methods returns 3.
• let's say the currentPageIndex() is 5 (so currentStartDocIndex() is 12) and there are 3 results per page, then the page has the capacity for potential results [12,13,14] and then this methods returns 3.
• let's say the currentPageIndex() is 5 (so currentStartDocIndex() is 12) and there are 3 results per page and there are 14 max results, then the page has the capacity for potential results [12,13] and then this methods returns 2.

Returns:

the maximum number of documents allowed in the current page

_endDocInclusiveIndex

private static int _endDocInclusiveIndex(int startDocIndex,
                                         int resultsPerPage)

_endDocExclusiveIndex

private static int _endDocExclusiveIndex(int startDocIndex,
                                         int resultsPerPage)

numberOfPages

public int numberOfPages(int totalHits)

Given the number of total hits, gets the number of pages

Parameters:

totalHits - the number of total hits

Returns:

the number of pages