Package org.nuxeo.ecm.platform.query.core

Class EmptyPageProvider<T extends Serializable>

java.lang.Object

org.nuxeo.ecm.platform.query.api.AbstractPageProvider<T>

org.nuxeo.ecm.platform.query.core.EmptyPageProvider<T>

All Implemented Interfaces:

Serializable, PageProvider<T>

public class EmptyPageProvider<T extends Serializable>
extends AbstractPageProvider<T>

Author:

Anahide Tchertchian

See Also:

Serialized Form

Field Summary

Fields inherited from class org.nuxeo.ecm.platform.query.api.AbstractPageProvider

currentEntryIndex, currentHigherNonEmptyPageIndex, currentSelectPage, definition, error, errorMessage, highlights, log, maxPageSize, name, offset, PAGEPROVIDER_TRACK_PROPERTY_NAME, pageProviderChangedListener, pageSize, pageSizeOptions, parameters, properties, quickFilters, resultsCount, searchDocumentModel, selectedEntries, SKIPPED_SCHEMAS_FOR_SEARCHFIELD, sortable, sortInfos, tracking

Fields inherited from interface org.nuxeo.ecm.platform.query.api.PageProvider

DEFAULT_MAX_PAGE_SIZE, DEFAULT_MAX_PAGE_SIZE_RUNTIME_PROP, HIGHLIGHT_CTX_DATA, PAGE_LIMIT_UNKNOWN, SKIP_AGGREGATES_PROP, UNKNOWN_SIZE, UNKNOWN_SIZE_AFTER_QUERY

Constructor Summary

Constructors

Constructor	Description
EmptyPageProvider()

Method Summary

Modifier and Type	Method	Description
List<T>	getCurrentPage()	Returns the list of current page items.

Methods inherited from class org.nuxeo.ecm.platform.query.api.AbstractPageProvider

addQuickFilter, addSortInfo, fireSearchEvent, firstPage, getAggregateDefinitions, getAggregates, getAvailableQuickFilters, getBooleanProperty, getCurrentEntry, getCurrentHigherNonEmptyPageIndex, getCurrentPageIndex, getCurrentPageOffset, getCurrentPageSize, getCurrentPageStatus, getCurrentSelectPage, getDefaultMaxPageSize, getDefinition, getError, getErrorMessage, getHighlights, getMaxNumberOfEmptyPages, getMaxPageSize, getMinMaxPageSize, getName, getNumberOfPages, getPageLimit, getPageSize, getPageSizeOptions, getParameters, getParametersChanged, getProperties, getQuickFilters, getResultsCount, getResultsCountLimit, getSearchDocumentModel, getSortInfo, getSortInfoIndex, getSortInfos, hasAggregateSupport, hasChangedParameters, hasError, incorporateAggregates, isLastPageAvailable, isNextEntryAvailable, isNextPageAvailable, isPreviousEntryAvailable, isPreviousPageAvailable, isSkipAggregates, isSortable, isTrackingEnabled, lastPage, nextEntry, nextPage, notifyPageChanged, notifyRefresh, pageChanged, previousEntry, previousPage, refresh, searchDocumentModelChanged, setCurrentEntry, setCurrentEntryIndex, setCurrentHigherNonEmptyPageIndex, setCurrentPage, setCurrentPageIndex, setCurrentPageOffset, setDefinition, setHighlights, setMaxPageSize, setName, setPageProviderChangedListener, setPageSize, setPageSizeOptions, setParameters, setProperties, setQuickFilters, setResultsCount, setSearchDocumentModel, setSelectedEntries, setSortable, setSortInfo, setSortInfo, setSortInfos, sortInfoChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyPageProvider

public EmptyPageProvider()

Method Detail

getCurrentPage

public List<T> getCurrentPage()

Description copied from class: AbstractPageProvider

Returns the list of current page items.

Custom implementation can be added here, based on the page provider properties, parameters and WhereClauseDefinition on the PageProviderDefinition, as well as search document, sort information, etc...

Implementation of this method usually consists in setting a non-null value to a field caching current items, and nullifying this field by overriding AbstractPageProvider.pageChanged() and AbstractPageProvider.refresh().

Fields AbstractPageProvider.errorMessage and AbstractPageProvider.error can also be filled to provide accurate feedback in case an error occurs during the search.

When items are retrieved, a call to AbstractPageProvider.setResultsCount(long) should be made to ensure proper pagination as implemented in this abstract class. The implementation in CoreQueryAndFetchPageProvider is a good example when the total results count is known.

If for performance reasons, for instance, the number of results cannot be known, a fall-back strategy can be applied to provide the "next" button but not the "last" one, by calling AbstractPageProvider.getCurrentHigherNonEmptyPageIndex() and AbstractPageProvider.setCurrentHigherNonEmptyPageIndex(int). In this case, CoreQueryDocumentPageProvider is a good example.

Specified by:

getCurrentPage in interface PageProvider<T extends Serializable>

Specified by:

getCurrentPage in class AbstractPageProvider<T extends Serializable>

Returns:

the current page