org.pentaho.reporting.engine.classic.core.layout.output
Class DefaultPageStateList

java.lang.Object
  org.pentaho.reporting.engine.classic.core.layout.output.DefaultPageStateList

All Implemented Interfaces:

PageStateList

public class DefaultPageStateList
extends Object
implements PageStateList

The ReportState list stores a report states for the beginning of every page. The list is filled on repagination and read when a report or a page of the report is printed.

Important: This list stores page start report states, not arbitary report states. These ReportStates are special: they can be reproduced by calling processPage on the report.

Internally this list is organized as a list of WeakReferenceLists, where every WeakReferenceList stores a certain number of page states. The first 20 states are stored in an ordinary list with strong-references, so these states never get GarbageCollected (and so they must never be restored by reprocessing them). The next 100 states are stored in 4-element ReferenceLists, so if a reference is lost, only 4 states have to be reprocessed. All other states are stored in 10-element lists.

Author:

Thomas Morgner

Constructor Summary

DefaultPageStateList(ReportProcessor proc)
Creates a new reportstatelist.

Method Summary

void	add(PageState pageState) Adds this report state to the end of the list.
void	clear() Removes all elements in the list.
PageState	get(int index) Retrieves the element on position index in this list.
int	size() Returns the number of elements in this list.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultPageStateList

public DefaultPageStateList(ReportProcessor proc)

Creates a new reportstatelist. The list will be filled using the specified report and output target. Filling of the list is done elsewhere.

Parameters:

proc - the reportprocessor used to restore lost states (null not permitted).

Throws:

NullPointerException - if the report processor is null.

Method Detail

size

public int size()

Returns the number of elements in this list.

Specified by:

size in interface PageStateList

Returns:

the number of elements in the list.

add

public void add(PageState pageState)

Adds this report state to the end of the list.

Specified by:

add in interface PageStateList

Parameters:

pageState - the report state.

clear

public void clear()

Removes all elements in the list.

Specified by:

clear in interface PageStateList

get

public PageState get(int index)

Retrieves the element on position index in this list.

Specified by:

get in interface PageStateList

Parameters:

index - the index.

Returns:

the report state.