org.openlowcode.server.data.properties

Class VersionedQueryHelper

java.lang.Object

org.openlowcode.server.data.properties.VersionedQueryHelper

public class VersionedQueryHelper
extends java.lang.Object

A helper for objects that are versioned

Author:

Open Lowcode SAS

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	singleobjectalias

Constructor Summary

Constructors

Constructor and Description
VersionedQueryHelper()

Method Summary

Modifier and Type	Method and Description
static VersionedQueryHelper	get() gets the singleton query helper
<E extends DataObject<E>> E[]	getallversions(DataObjectMasterId<E> masterid, QueryFilter additionalquerycondition, DataObjectDefinition<E> definition, VersionedDefinition<E> propertydefinition) gets all versions of the object for the specified master id
<E extends DataObject<E>> E	getlastversion(DataObjectMasterId<E> masterid, DataObjectDefinition<E> definition, VersionedDefinition<E> propertydefinition) gest the last version of the object for the specified master id
static QueryCondition	getLatestVersionQueryCondition(TableAlias alias, DataObjectDefinition parentdefinition) gets a query condition that only returns the latest version of an object
static QueryCondition	getMasterIdQueryCondition(TableAlias alias, java.lang.String masteridvalue, DataObjectDefinition parentdefinition) gets a query condition filtering on master id (the common identifier to all versions of an object)
static QueryCondition	getVersionQueryCondition(TableAlias alias, java.lang.String versionvalue, DataObjectDefinition parentdefinition) a query condition that filters on the specified version value

Methods inherited from class java.lang.Object

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

Field Detail

singleobjectalias

public static java.lang.String singleobjectalias

Constructor Detail

VersionedQueryHelper

public VersionedQueryHelper()

Method Detail

getMasterIdQueryCondition

public static QueryCondition getMasterIdQueryCondition(TableAlias alias,
                                                       java.lang.String masteridvalue,
                                                       DataObjectDefinition parentdefinition)

gets a query condition filtering on master id (the common identifier to all versions of an object)

Parameters:

alias - table alias

masteridvalue - the value to filter on

parentdefinition - definition of the object the condition is applied on

Returns:

a query condition with the specified filter

getLatestVersionQueryCondition

public static QueryCondition getLatestVersionQueryCondition(TableAlias alias,
                                                            DataObjectDefinition parentdefinition)

gets a query condition that only returns the latest version of an object

Parameters:

alias - alias to put the condition on

parentdefinition - definition of the object

Returns:

the condition as specified

getVersionQueryCondition

public static QueryCondition getVersionQueryCondition(TableAlias alias,
                                                      java.lang.String versionvalue,
                                                      DataObjectDefinition parentdefinition)

a query condition that filters on the specified version value

Parameters:

alias - table alias to build the condition on

versionvalue - version value to filter on

parentdefinition - definition of the object

Returns:

the condition as specified

get

public static VersionedQueryHelper get()

gets the singleton query helper

Returns:

the singleton

getlastversion

public <E extends DataObject<E>> E getlastversion(DataObjectMasterId<E> masterid,
                                                  DataObjectDefinition<E> definition,
                                                  VersionedDefinition<E> propertydefinition)

gest the last version of the object for the specified master id

Parameters:

masterid - master id

definition - definiton of the object

propertydefinition - definition of the versioned property for the object

Returns:

the last version of the object for the master id, or null if nothing is found

getallversions

public <E extends DataObject<E>> E[] getallversions(DataObjectMasterId<E> masterid,
                                                    QueryFilter additionalquerycondition,
                                                    DataObjectDefinition<E> definition,
                                                    VersionedDefinition<E> propertydefinition)

gets all versions of the object for the specified master id

Parameters:

masterid - master id of the object

additionalquerycondition - additional query condition if required (can be null if unused)

definition - definition of the data object

propertydefinition - property of the data object

Returns:

all versions of the object corresponding to the master id and potential additional query condition