Package name.matthewgreet.strutscommons.util

Interface PageByIndexRangeFinder<M extends Serializable,T extends Serializable>

All Superinterfaces:

Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface PageByIndexRangeFinder<M extends Serializable,T extends Serializable>
extends Serializable

Strategy for lazy loading a page of records to display from an index range (0 based), typically with list size found by ListSizeFinder. This is particularly useful for reading MySQL tables traversing an index using OFFSET and LIMIT keywords.

Method Summary

Modifier and Type	Method	Description
List<T>	getItems(M selectedMaster, int startIndex, int endIndex)	Returns items within a range of indices, where indices start at 0.
default boolean	getLoadsDetails()	Returns true if finder eager loads any optional extensions of each item.

Method Details

getItems

List<T> getItems(M selectedMaster,
 int startIndex,
 int endIndex)
          throws Exception

Returns items within a range of indices, where indices start at 0. If the range covers indices that don't exist, any records that are in range should be returned. No item should ever be null. For convenience of MySQL adapters, OFFSET is startIndex and LIMIT is endIndex - startIndex + 1.

Parameters:

selectedMaster - Selected record in master list or null for loading master list.

startIndex - Start of index range, where indices start at zero.

endIndex - End of index range (inclusive), where indices start at zero.

Throws:

Exception

getLoadsDetails

default boolean getLoadsDetails()

Returns true if finder eager loads any optional extensions of each item. This is usually false as loading extensions results in poor performance or there are no optional extensions.