PagedListHolder (Spring Framework 3.2.5.RELEASE API)

java.lang.Object
- org.springframework.beans.support.PagedListHolder<E>

All Implemented Interfaces:

Serializable
```
public class PagedListHolder<E>
extends Object
implements Serializable
```
PagedListHolder is a simple state holder for handling lists of objects, separating them into pages. Page numbering starts with 0.
This is mainly targetted at usage in web UIs. Typically, an instance will be instantiated with a list of beans, put into the session, and exported as model. The properties can all be set/get programmatically, but the most common way will be data binding, i.e. populating the bean from request parameters. The getters will mainly be used by the view.
Supports sorting the underlying list via a SortDefinition implementation, available as property "sort". By default, a MutableSortDefinition instance will be used, toggling the ascending value on setting the same property again.
The data binding names have to be called "pageSize" and "sort.ascending", as expected by BeanWrapper. Note that the names and the nesting syntax match the respective JSTL EL expressions, like "myModelAttr.pageSize" and "myModelAttr.sort.ascending".

Since:

19.05.2003

Author:

Juergen Hoeller

See Also:
getPageList(), MutableSortDefinition, Serialized Form

Field Summary

Fields
Modifier and Type Field and Description

static int DEFAULT_MAX_LINKED_PAGES

static int DEFAULT_PAGE_SIZE

Fields
Modifier and Type	Field and Description
`static int`	`DEFAULT_MAX_LINKED_PAGES`
`static int`	`DEFAULT_PAGE_SIZE`

Constructor Summary

Constructors
Constructor and Description
`PagedListHolder()` Create a new holder instance.
`PagedListHolder(List<E> source)` Create a new holder instance with the given source list, starting with a default sort definition (with "toggleAscendingOnProperty" activated).
`PagedListHolder(List<E> source, SortDefinition sort)` Create a new holder instance with the given source list.

Method Summary

Methods
Modifier and Type	Method and Description
`protected SortDefinition`	`copySortDefinition(SortDefinition sort)` Create a deep copy of the given sort definition, for use as state holder to compare a modified sort definition against.
`protected void`	`doSort(List<E> source, SortDefinition sort)` Actually perform sorting of the given source list, according to the given sort definition.
`int`	`getFirstElementOnPage()` Return the element index of the first element on the current page.
`int`	`getFirstLinkedPage()` Return the first page to which create a link around the current page.
`int`	`getLastElementOnPage()` Return the element index of the last element on the current page.
`int`	`getLastLinkedPage()` Return the last page to which create a link around the current page.
`int`	`getMaxLinkedPages()` Return the maximum number of page links to a few pages around the current one.
`int`	`getNrOfElements()` Return the total number of elements in the source list.
`int`	`getPage()` Return the current page number.
`int`	`getPageCount()` Return the number of pages for the current source list.
`List<E>`	`getPageList()` Return a sub-list representing the current page.
`int`	`getPageSize()` Return the current page size.
`Date`	`getRefreshDate()` Return the last time the list has been fetched from the source provider.
`SortDefinition`	`getSort()` Return the sort definition for this holder.
`List<E>`	`getSource()` Return the source list for this holder.
`boolean`	`isFirstPage()` Return if the current page is the first one.
`boolean`	`isLastPage()` Return if the current page is the last one.
`void`	`nextPage()` Switch to next page.
`void`	`previousPage()` Switch to previous page.
`void`	`resort()` Resort the list if necessary, i.e.
`void`	`setMaxLinkedPages(int maxLinkedPages)` Set the maximum number of page links to a few pages around the current one.
`void`	`setPage(int page)` Set the current page number.
`void`	`setPageSize(int pageSize)` Set the current page size.
`void`	`setSort(SortDefinition sort)` Set the sort definition for this holder.
`void`	`setSource(List<E> source)` Set the source list for this holder.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_PAGE_SIZE
```
public static final int DEFAULT_PAGE_SIZE
```
    See Also:
    Constant Field Values
  - DEFAULT_MAX_LINKED_PAGES
```
public static final int DEFAULT_MAX_LINKED_PAGES
```
    See Also:
    Constant Field Values
- Constructor Detail
  - PagedListHolder
```
public PagedListHolder()
```
    Create a new holder instance. You'll need to set a source list to be able to use the holder.
    
    See Also:
    setSource(java.util.List<E>)
  - PagedListHolder
```
public PagedListHolder(List<E> source)
```
    Create a new holder instance with the given source list, starting with a default sort definition (with "toggleAscendingOnProperty" activated).
    
    Parameters:
    source - the source List
    See Also:
    MutableSortDefinition.setToggleAscendingOnProperty(boolean)
  - PagedListHolder
```
public PagedListHolder(List<E> source,
               SortDefinition sort)
```
    Create a new holder instance with the given source list.
    
    Parameters:
    source - the source List
    sort - the SortDefinition to start with
- Method Detail
  - setSource
```
public void setSource(List<E> source)
```
    Set the source list for this holder.
  - getSource
```
public List<E> getSource()
```
    Return the source list for this holder.
  - getRefreshDate
```
public Date getRefreshDate()
```
    Return the last time the list has been fetched from the source provider.
  - setSort
```
public void setSort(SortDefinition sort)
```
    Set the sort definition for this holder. Typically an instance of MutableSortDefinition.
    
    See Also:
    MutableSortDefinition
  - getSort
```
public SortDefinition getSort()
```
    Return the sort definition for this holder.
  - setPageSize
```
public void setPageSize(int pageSize)
```
    Set the current page size. Resets the current page number if changed.
    Default value is 10.
  - getPageSize
```
public int getPageSize()
```
    Return the current page size.
  - setPage
```
public void setPage(int page)
```
    Set the current page number. Page numbering starts with 0.
  - getPage
```
public int getPage()
```
    Return the current page number. Page numbering starts with 0.
  - setMaxLinkedPages
```
public void setMaxLinkedPages(int maxLinkedPages)
```
    Set the maximum number of page links to a few pages around the current one.
  - getMaxLinkedPages
```
public int getMaxLinkedPages()
```
    Return the maximum number of page links to a few pages around the current one.
  - getPageCount
```
public int getPageCount()
```
    Return the number of pages for the current source list.
  - isFirstPage
```
public boolean isFirstPage()
```
    Return if the current page is the first one.
  - isLastPage
```
public boolean isLastPage()
```
    Return if the current page is the last one.
  - previousPage
```
public void previousPage()
```
    Switch to previous page. Will stay on first page if already on first page.
  - nextPage
```
public void nextPage()
```
    Switch to next page. Will stay on last page if already on last page.
  - getNrOfElements
```
public int getNrOfElements()
```
    Return the total number of elements in the source list.
  - getFirstElementOnPage
```
public int getFirstElementOnPage()
```
    Return the element index of the first element on the current page. Element numbering starts with 0.
  - getLastElementOnPage
```
public int getLastElementOnPage()
```
    Return the element index of the last element on the current page. Element numbering starts with 0.
  - getPageList
```
public List<E> getPageList()
```
    Return a sub-list representing the current page.
  - getFirstLinkedPage
```
public int getFirstLinkedPage()
```
    Return the first page to which create a link around the current page.
  - getLastLinkedPage
```
public int getLastLinkedPage()
```
    Return the last page to which create a link around the current page.
  - resort
```
public void resort()
```
    Resort the list if necessary, i.e. if the current sort instance isn't equal to the backed-up sortUsed instance.
    Calls doSort to trigger actual sorting.
    
    See Also:
    doSort(java.util.List<E>, org.springframework.beans.support.SortDefinition)
  - copySortDefinition
```
protected SortDefinition copySortDefinition(SortDefinition sort)
```
    Create a deep copy of the given sort definition, for use as state holder to compare a modified sort definition against.
    Default implementation creates a MutableSortDefinition instance. Can be overridden in subclasses, in particular in case of custom extensions to the SortDefinition interface. Is allowed to return null, which means that no sort state will be held, triggering actual sorting for each resort call.
    
    Parameters:
    sort - the current SortDefinition object
    
    Returns:
    a deep copy of the SortDefinition object
    See Also:
    MutableSortDefinition.MutableSortDefinition(SortDefinition)
  - doSort
```
protected void doSort(List<E> source,
          SortDefinition sort)
```
    Actually perform sorting of the given source list, according to the given sort definition.
    The default implementation uses Spring's PropertyComparator. Can be overridden in subclasses.
    
    See Also:
    PropertyComparator.sort(java.util.List, SortDefinition)

Class PagedListHolder<E>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_PAGE_SIZE

DEFAULT_MAX_LINKED_PAGES

Constructor Detail

PagedListHolder

PagedListHolder

PagedListHolder

Method Detail

setSource

getSource

getRefreshDate

setSort

getSort

setPageSize

getPageSize

setPage

getPage

setMaxLinkedPages

getMaxLinkedPages

getPageCount

isFirstPage

isLastPage

previousPage

nextPage

getNrOfElements

getFirstElementOnPage

getLastElementOnPage

getPageList

getFirstLinkedPage

getLastLinkedPage

resort

copySortDefinition

doSort