org.nuxeo.ecm.platform.query.nxql

Class CoreQueryDocumentPageProvider

java.lang.Object

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

org.nuxeo.ecm.platform.query.nxql.CoreQueryDocumentPageProvider

All Implemented Interfaces:

Serializable, PageProvider<DocumentModel>

Direct Known Subclasses:

ElasticSearchNxqlPageProvider, ImportFolderPageProvider, ImportFolderPageProvider

public class CoreQueryDocumentPageProvider
extends AbstractPageProvider<DocumentModel>

Page provider performing a query on a core session.

It builds the query at each call so that it can refresh itself when the query changes.

The page provider property named CORE_SESSION_PROPERTY is used to pass the CoreSession instance that will perform the query. The optional property CHECK_QUERY_CACHE_PROPERTY can be set to "true" to avoid performing the query again if it did not change.

Since 6.0, the page provider property named USE_UNRESTRICTED_SESSION_PROPERTY allows specifying whether the query should be run as unrestricted. When such a property is set to "true", the additional property DETACH_DOCUMENTS_PROPERTY is used to detach documents (defaults to true when session is unrestricted).

Since:

5.4

Author:

Anahide Tchertchian

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	CHECK_QUERY_CACHE_PROPERTY
static String	CORE_SESSION_PROPERTY
static String	DEFAULT_NAVIGATION_RESULTS_KEY
static String	DEFAULT_NAVIGATION_RESULTS_PROPERTY
static String	DEFAULT_NAVIGATION_RESULTS_VALUE
static String	DETACH_DOCUMENTS_PROPERTY Boolean property stating that documents should be detached, only useful when property USE_UNRESTRICTED_SESSION_PROPERTY is set to true.
static String	MAX_RESULTS_PROPERTY
static String	PAGE_SIZE_RESULTS_KEY
static String	USE_UNRESTRICTED_SESSION_PROPERTY Boolean property stating that query should be unrestricted.

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

DEFAULT_MAX_PAGE_SIZE, DEFAULT_MAX_PAGE_SIZE_RUNTIME_PROP, PAGE_LIMIT_UNKNOWN, UNKNOWN_SIZE, UNKNOWN_SIZE_AFTER_QUERY

Constructor Summary

Constructors

Constructor and Description
CoreQueryDocumentPageProvider()

Method Summary

Methods

Modifier and Type	Method and Description
List<DocumentModel>	getCurrentPage() Returns the list of current page items.
String	getCurrentQuery()
PageSelections<DocumentModel>	getCurrentSelectPage() Returns the current page of results wrapped in a PageSelection item.
long	getMaxResults() Returns the maximum number of results or 0 if there is no limit.
long	getPageLimit() Returns the page limit.
void	refresh() Refresh hook, to override for custom behavior
void	setMaxResults(long maxResults) Sets the maximum number of result elements.

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

addSortInfo, firstPage, getAggregateDefinitions, getAggregates, getCurrentEntry, getCurrentHigherNonEmptyPageIndex, getCurrentPageIndex, getCurrentPageOffset, getCurrentPageSize, getCurrentPageStatus, getDefinition, getError, getErrorMessage, getMaxNumberOfEmptyPages, getMaxPageSize, getMinMaxPageSize, getName, getNumberOfPages, getPageSize, getParameters, getProperties, getResultsCount, getSearchDocumentModel, getSortInfo, getSortInfoIndex, getSortInfos, hasAggregateSupport, hasChangedParameters, hasError, isLastPageAvailable, isNextEntryAvailable, isNextPageAvailable, isPreviousEntryAvailable, isPreviousPageAvailable, isSortable, last, lastPage, next, nextEntry, nextPage, previous, previousEntry, previousPage, rewind, setCurrentEntry, setCurrentEntryIndex, setCurrentHigherNonEmptyPageIndex, setCurrentPage, setCurrentPageIndex, setCurrentPageOffset, setDefinition, setMaxPageSize, setName, setPageProviderChangedListener, setPageSize, setParameters, setProperties, setResultsCount, setSearchDocumentModel, setSelectedEntries, setSortable, setSortInfo, setSortInfo, setSortInfos

Methods inherited from class java.lang.Object

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

Field Detail

CORE_SESSION_PROPERTY

public static final String CORE_SESSION_PROPERTY

See Also:

Constant Field Values

MAX_RESULTS_PROPERTY

public static final String MAX_RESULTS_PROPERTY

See Also:

Constant Field Values

DEFAULT_NAVIGATION_RESULTS_KEY

public static final String DEFAULT_NAVIGATION_RESULTS_KEY

See Also:

Constant Field Values

PAGE_SIZE_RESULTS_KEY

public static final String PAGE_SIZE_RESULTS_KEY

See Also:

Constant Field Values

DEFAULT_NAVIGATION_RESULTS_PROPERTY

public static final String DEFAULT_NAVIGATION_RESULTS_PROPERTY

See Also:

Constant Field Values

DEFAULT_NAVIGATION_RESULTS_VALUE

public static final String DEFAULT_NAVIGATION_RESULTS_VALUE

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Constant Field Values

CHECK_QUERY_CACHE_PROPERTY

public static final String CHECK_QUERY_CACHE_PROPERTY

See Also:

Constant Field Values

USE_UNRESTRICTED_SESSION_PROPERTY

public static final String USE_UNRESTRICTED_SESSION_PROPERTY

Boolean property stating that query should be unrestricted.

Since:

6.0

See Also:

Constant Field Values

DETACH_DOCUMENTS_PROPERTY

public static final String DETACH_DOCUMENTS_PROPERTY

Boolean property stating that documents should be detached, only useful when property USE_UNRESTRICTED_SESSION_PROPERTY is set to true.

When an unrestricted session is used, this property defaults to true.

Since:

6.0

See Also:

Constant Field Values

Constructor Detail

CoreQueryDocumentPageProvider

public CoreQueryDocumentPageProvider()

Method Detail

getCurrentPage

public List<DocumentModel> 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<DocumentModel>

Specified by:

getCurrentPage in class AbstractPageProvider<DocumentModel>

Returns:

the current page

getMaxResults

public long getMaxResults()

Returns the maximum number of results or 0 if there is no limit.

Since:

5.6

getPageLimit

public long getPageLimit()

Returns the page limit. The n first page we know they exist. We don't compute the number of page beyond this limit.

Specified by:

getPageLimit in interface PageProvider<DocumentModel>

Overrides:

getPageLimit in class AbstractPageProvider<DocumentModel>

Since:

5.8

setMaxResults

public void setMaxResults(long maxResults)

Sets the maximum number of result elements.

Since:

5.6

getCurrentSelectPage

public PageSelections<DocumentModel> getCurrentSelectPage()

Description copied from interface: PageProvider

Returns the current page of results wrapped in a PageSelection item.

By default, no entry is selected, unless PageProvider.setSelectedEntries(List) has been called before.

Specified by:

getCurrentSelectPage in interface PageProvider<DocumentModel>

Overrides:

getCurrentSelectPage in class AbstractPageProvider<DocumentModel>

getCurrentQuery

public String getCurrentQuery()

refresh

public void refresh()

Description copied from class: AbstractPageProvider

Refresh hook, to override for custom behavior

When overriding it, call super.refresh() as last statement to make sure that the PageProviderChangedListener is called with the up-to-date @{code PageProvider} state.

Specified by:

refresh in interface PageProvider<DocumentModel>

Overrides:

refresh in class AbstractPageProvider<DocumentModel>