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A class used to encapsulate the default state information for a data grid. All grids are
capable of supporting sorting, filtering, and paging. This class holds the JavaBean model
objects that maintain the sort, filter, and page state of a data grid.
Instances of DataGridState can live longer than a single request. As a result, DataGridState
objects are serializable, so subclasses should avoid non-transient references to objects
like the
javax.servlet.http.HttpServletRequest .
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