Class PageStateList

java.lang.Object
org.jfree.report.flow.paginating.PageStateList

public class PageStateList extends Object
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 Details

    • PageStateList

      public PageStateList(PaginatingReportProcessor 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 Details

    • getPageProcess

      protected PaginatingReportProcessor getPageProcess()
    • size

      public int size()
      Returns the number of elements in this list.
      Returns:
      the number of elements in the list.
    • add

      public void add(PageState state)
      Adds this report state to the end of the list.
      Parameters:
      state - the report state.
    • clear

      public void clear()
      Removes all elements in the list.
    • get

      public PageState get(int index)
      Retrieves the element on position index in this list.
      Parameters:
      index - the index.
      Returns:
      the report state.