er.extensions
Class ERXBatchingDisplayGroup

java.lang.Object
  com.webobjects.appserver.WODisplayGroup
      er.extensions.ERXBatchingDisplayGroup

All Implemented Interfaces:

EOKeyValueArchiving, EOKeyValueArchiving.Awaking, NSDisposable, NSKeyValueCoding, NSKeyValueCoding.ErrorHandling, Serializable

public class ERXBatchingDisplayGroup

extends WODisplayGroup

Extends WODisplayGroup in order to provide real batching. This is done by adding database specific code to the select statement from the EOFetchSpecification from the WODisplayGroup's EODataSource which must be an EODatabaseDataSource.

See Also:

Serialized Form

Nested Class Summary

Nested classes inherited from class com.webobjects.appserver.WODisplayGroup

WODisplayGroup.Delegate

Nested classes inherited from class com.webobjects.foundation.NSKeyValueCoding

NSKeyValueCoding._BooleanFieldBinding, NSKeyValueCoding._BooleanMethodBinding, NSKeyValueCoding._FieldBinding, NSKeyValueCoding._ForwardingBinding, NSKeyValueCoding._KeyBinding, NSKeyValueCoding._KeyBindingCreation, NSKeyValueCoding._MethodBinding, NSKeyValueCoding._NumberFieldBinding, NSKeyValueCoding._NumberMethodBinding, NSKeyValueCoding._ReflectionKeyBindingCreation, NSKeyValueCoding.DefaultImplementation, NSKeyValueCoding.ErrorHandling, NSKeyValueCoding.Null, NSKeyValueCoding.UnknownKeyException, NSKeyValueCoding.Utility, NSKeyValueCoding.ValueAccessor

Nested classes inherited from class com.webobjects.eocontrol.EOKeyValueArchiving

EOKeyValueArchiving._NullValueSupport, EOKeyValueArchiving._NumberSupport, EOKeyValueArchiving._TimestampSupport, EOKeyValueArchiving.Awaking, EOKeyValueArchiving.FinishInitialization, EOKeyValueArchiving.Support

Field Summary

protected NSArray	_displayedObjects cache for the displayed objects
protected Boolean	_isBatching
protected int	_rowCount total number of rows

Fields inherited from class com.webobjects.appserver.WODisplayGroup

DisplayGroupWillFetchNotification

Fields inherited from interface com.webobjects.foundation.NSKeyValueCoding

_CLASS, NullValue

Fields inherited from interface com.webobjects.foundation.NSKeyValueCoding.ErrorHandling

_CLASS

Fields inherited from interface com.webobjects.foundation.NSDisposable

_CLASS

Fields inherited from interface com.webobjects.eocontrol.EOKeyValueArchiving

_CLASS

Fields inherited from interface com.webobjects.eocontrol.EOKeyValueArchiving.Awaking

_CLASS

Constructor Summary

ERXBatchingDisplayGroup()

Method Summary

int	batchCount() Overridden in order to use a custom method which determines the number of Objects / rows for the existing EODatabaseDataSource.
EODatabaseDataSource	databaseDataSource()
NSArray	displayedObjects() Overridden method in order to fetch -only- the rows that are needed.
boolean	isBatching() Determines if batching is possible.
void	redisplay()
int	rowCount() Returns the number of rows from the EODatabaseDataSource.
void	setCurrentBatchIndex(int index)
void	setDataSource(EODataSource eodatasource)
void	setIsBatching(boolean value)

Methods inherited from class com.webobjects.appserver.WODisplayGroup

_beginObserverNotification, _deleteObject, _insertObjectAtIndex, _lastObserverNotified, allObjects, allQualifierOperators, awakeFromKeyValueUnarchiver, clearSelection, currentBatchIndex, dataSource, decodeWithKeyValueUnarchiver, defaultStringMatchFormat, defaultStringMatchOperator, delegate, delete, deleteObjectAtIndex, deleteSelection, detailKey, displayBatchContainingSelectedObject, displayNextBatch, displayPreviousBatch, dispose, editingContextPresentErrorMessage, encodeWithCoder, encodeWithKeyValueArchiver, endEditing, fetch, fetchesOnLoad, finishInitialization, globalDefaultForValidatesChangesImmediately, globalDefaultStringMatchFormat, globalDefaultStringMatchOperator, handleQueryWithUnboundKey, handleTakeValueForUnboundKey, hasDetailDataSource, hasMultipleBatches, indexOfFirstDisplayedObject, indexOfLastDisplayedObject, initWithCoder, inQueryMode, insert, insertedObjectDefaultValues, insertNewObjectAtIndex, insertObjectAtIndex, localKeys, masterObject, numberOfObjectsPerBatch, objectsChangedInEditingContext, objectsInvalidatedInEditingContext, qualifier, qualifierFromQueryValues, qualifyDataSource, qualifyDisplayGroup, queryBindings, queryMatch, queryMax, queryMin, queryOperator, relationalQualifierOperators, selectedObject, selectedObjects, selectionIndexes, selectNext, selectObject, selectObjectsIdenticalTo, selectObjectsIdenticalToSelectFirstOnNoMatch, selectPrevious, selectsFirstObjectAfterFetch, setDefaultStringMatchFormat, setDefaultStringMatchOperator, setDelegate, setDetailKey, setFetchesOnLoad, setGlobalDefaultForValidatesChangesImmediately, setGlobalDefaultStringMatchFormat, setGlobalDefaultStringMatchOperator, setInQueryMode, setInsertedObjectDefaultValues, setLocalKeys, setMasterObject, setNumberOfObjectsPerBatch, setObjectArray, setQualifier, setSelectedObject, setSelectedObjects, setSelectionIndexes, setSelectsFirstObjectAfterFetch, setSortOrderings, setValidatesChangesImmediately, sortOrderings, stringQualifierOperators, takeValueForKey, toString, unableToSetNullForKey, undoManager, updateDisplayedObjects, validatesChangesImmediately, valueForKey, willChange

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

_rowCount

protected int _rowCount

total number of rows

_displayedObjects

protected NSArray _displayedObjects

cache for the displayed objects

_isBatching

protected Boolean _isBatching

Constructor Detail

ERXBatchingDisplayGroup

public ERXBatchingDisplayGroup()

Method Detail

setIsBatching

public void setIsBatching(boolean value)

isBatching

public boolean isBatching()

Determines if batching is possible.

Returns:

true if dataSource is an instance of EODatabaseDataSource

setDataSource

public void setDataSource(EODataSource eodatasource)

batchCount

public int batchCount()

Overridden in order to use a custom method which determines the number of Objects / rows for the existing EODatabaseDataSource.

Returns:

the number of rows from the EODatabaseDataSource

rowCount

public int rowCount()

Returns the number of rows from the EODatabaseDataSource.

Returns:

the number of rows from the EODatabaseDataSource

databaseDataSource

public EODatabaseDataSource databaseDataSource()

redisplay

public void redisplay()

setCurrentBatchIndex

public void setCurrentBatchIndex(int index)

displayedObjects

public NSArray displayedObjects()

Overridden method in order to fetch -only- the rows that are needed. This is different to the editors methods because a WODisplayGroup would always fetch from the start until the end of the objects from the fetch limit.

Returns:

the objects that should be diplayed.