com.erudika.para.utils

Class Pager

java.lang.Object

com.erudika.para.utils.Pager

public class Pager
extends Object

This class stores pagination data. It limits the results for queries in the DAO and Search objects and also counts the total number of results that are returned.

Author:

Alex Bogdanovski [alex@erudika.com]

Constructor Summary

Constructors

Constructor and Description
Pager() No-args constructor.
Pager(int limit) Default constructor with limit.
Pager(long page, int limit) Default constructor with a page and count.
Pager(long page, String sortby, boolean desc, int limit) Default constructor with a page, count, sortby, desc and limit.

Method Summary

Modifier and Type	Method and Description
long	getCount() The total number of results for a query.
String	getLastKey() Returns the last key from last page.
int	getLimit() Limits the maximum number of results to return in one page.
String	getName() Name of this pager object (optional).
long	getPage() Page number.
String	getSortby() The name of the field used when sorting the results.
boolean	isDesc() The sort order.
void	setCount(long count) Set the value of count.
void	setDesc(boolean desc) Sets the value of desc.
void	setLastKey(String lastKey) Sets the last key from last page.
void	setLimit(int limit) Set the value of limit.
void	setName(String name) Set the value of name.
void	setPage(long page) Set the value of page.
void	setSortby(String sortby) Sets the value of sortby.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Pager

public Pager()

No-args constructor.

Pager

public Pager(int limit)

Default constructor with limit.

Parameters:

limit - the results limit

Pager

public Pager(long page,
             int limit)

Default constructor with a page and count.

Parameters:

page - the page number

limit - the results limit

Pager

public Pager(long page,
             String sortby,
             boolean desc,
             int limit)

Default constructor with a page, count, sortby, desc and limit.

Parameters:

page - the page number

sortby - name of property to sort by

desc - sort order

limit - the results limit

Method Detail

getLastKey

public String getLastKey()

Returns the last key from last page. Used for scanning and pagination.

Returns:

the last key to continue from

setLastKey

public void setLastKey(String lastKey)

Sets the last key from last page. Used for scanning and pagination.

Parameters:

lastKey - last id

getName

public String getName()

Name of this pager object (optional). Used to distinguish between multiple pagers.

Returns:

the name

setName

public void setName(String name)

Set the value of name.

Parameters:

name - the name (optional)

getSortby

public String getSortby()

The name of the field used when sorting the results.

Returns:

the name of the field or "timestamp" as the default sorting

setSortby

public void setSortby(String sortby)

Sets the value of sortby.

Parameters:

sortby - the sort field

isDesc

public boolean isDesc()

The sort order. Default: descending (true)

Returns:

true if descending

setDesc

public void setDesc(boolean desc)

Sets the value of desc.

Parameters:

desc - true if descending order

getLimit

public int getLimit()

Limits the maximum number of results to return in one page.

Returns:

the max number of results in one page

setLimit

public void setLimit(int limit)

Set the value of limit.

Parameters:

limit - the max number of results in one page

getCount

public long getCount()

The total number of results for a query.

Returns:

total count of results

setCount

public void setCount(long count)

Set the value of count.

Parameters:

count - total count

getPage

public long getPage()

Page number. Usually starts from 1...

Returns:

the page number

setPage

public void setPage(long page)

Set the value of page.

Parameters:

page - the page number

toString

public String toString()

Overrides:

toString in class Object