org.activiti.engine.impl

Class AbstractQuery<T extends Query<?,?>,U>

java.lang.Object

org.activiti.engine.impl.db.ListQueryParameterObject

org.activiti.engine.impl.AbstractQuery<T,U>

All Implemented Interfaces:

Serializable, Command<Object>, Query<T,U>

Direct Known Subclasses:

AbstractVariableQueryImpl, DeploymentQueryImpl, EventSubscriptionQueryImpl, GroupQueryImpl, HistoricActivityInstanceQueryImpl, HistoricDetailQueryImpl, HistoricVariableInstanceQueryImpl, JobQueryImpl, ModelQueryImpl, ProcessDefinitionQueryImpl, UserQueryImpl

public abstract class AbstractQuery<T extends Query<?,?>,U>
extends ListQueryParameterObject
implements Command<Object>, Query<T,U>, Serializable

Abstract superclass for all query types.

Author:

Joram Barrez

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractQuery.NullHandlingOnOrder

Field Summary

Fields

Modifier and Type	Field and Description
protected CommandContext	commandContext
protected CommandExecutor	commandExecutor
protected String	databaseType
protected AbstractQuery.NullHandlingOnOrder	nullHandlingOnOrder
protected String	orderBy
protected QueryProperty	orderProperty
protected org.activiti.engine.impl.AbstractQuery.ResultType	resultType
static String	SORTORDER_ASC
static String	SORTORDER_DESC

Fields inherited from class org.activiti.engine.impl.db.ListQueryParameterObject

firstResult, maxResults, parameter

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractQuery()
	AbstractQuery(CommandContext commandContext)
protected	AbstractQuery(CommandExecutor commandExecutor)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addOrder(String column, String sortOrder, AbstractQuery.NullHandlingOnOrder nullHandlingOnOrder)
T	asc() Order the results ascending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).
protected void	checkQueryOk()
long	count() Executes the query and returns the number of results
T	desc() Order the results descending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).
T	direction(Direction direction)
Object	execute(CommandContext commandContext)
abstract long	executeCount(CommandContext commandContext)
abstract List<U>	executeList(CommandContext commandContext, Page page) Executes the actual query to retrieve the list of results.
U	executeSingleResult(CommandContext commandContext)
String	getDatabaseType()
String	getOrderBy()
List<U>	list() Executes the query and get a list of entities as the result.
List<U>	listPage(int firstResult, int maxResults) Executes the query and get a list of entities as the result.
T	orderBy(QueryProperty property)
T	orderBy(QueryProperty property, AbstractQuery.NullHandlingOnOrder nullHandlingOnOrder)
AbstractQuery<T,U>	setCommandExecutor(CommandExecutor commandExecutor)
void	setDatabaseType(String databaseType)
U	singleResult() Executes the query and returns the resulting entity or null if no entity matches the query criteria.

Methods inherited from class org.activiti.engine.impl.db.ListQueryParameterObject

getFirstResult, getFirstRow, getLastRow, getMaxResults, getParameter, setFirstResult, setMaxResults, setParameter

Methods inherited from class java.lang.Object

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

Field Detail

SORTORDER_ASC

public static final String SORTORDER_ASC

See Also:

Constant Field Values

SORTORDER_DESC

public static final String SORTORDER_DESC

See Also:

Constant Field Values

commandExecutor

protected transient CommandExecutor commandExecutor

commandContext

protected transient CommandContext commandContext

databaseType

protected String databaseType

orderBy

protected String orderBy

resultType

protected org.activiti.engine.impl.AbstractQuery.ResultType resultType

orderProperty

protected QueryProperty orderProperty

nullHandlingOnOrder

protected AbstractQuery.NullHandlingOnOrder nullHandlingOnOrder

Constructor Detail

AbstractQuery

protected AbstractQuery()

AbstractQuery

protected AbstractQuery(CommandExecutor commandExecutor)

AbstractQuery

public AbstractQuery(CommandContext commandContext)

Method Detail

setCommandExecutor

public AbstractQuery<T,U> setCommandExecutor(CommandExecutor commandExecutor)

orderBy

public T orderBy(QueryProperty property)

orderBy

public T orderBy(QueryProperty property,
        AbstractQuery.NullHandlingOnOrder nullHandlingOnOrder)

asc

public T asc()

Description copied from interface: Query

Order the results ascending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).

Specified by:

asc in interface Query<T extends Query<?,?>,U>

desc

public T desc()

Description copied from interface: Query

Order the results descending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).

Specified by:

desc in interface Query<T extends Query<?,?>,U>

direction

public T direction(Direction direction)

checkQueryOk

protected void checkQueryOk()

singleResult

public U singleResult()

Description copied from interface: Query

Executes the query and returns the resulting entity or null if no entity matches the query criteria.

Specified by:

singleResult in interface Query<T extends Query<?,?>,U>

list

public List<U> list()

Description copied from interface: Query

Executes the query and get a list of entities as the result.

Specified by:

list in interface Query<T extends Query<?,?>,U>

listPage

public List<U> listPage(int firstResult,
               int maxResults)

Description copied from interface: Query

Executes the query and get a list of entities as the result.

Specified by:

listPage in interface Query<T extends Query<?,?>,U>

count

public long count()

Description copied from interface: Query

Executes the query and returns the number of results

Specified by:

count in interface Query<T extends Query<?,?>,U>

execute

public Object execute(CommandContext commandContext)

Specified by:

execute in interface Command<Object>

executeCount

public abstract long executeCount(CommandContext commandContext)

executeList

public abstract List<U> executeList(CommandContext commandContext,
                  Page page)

Executes the actual query to retrieve the list of results.

Parameters:

page - used if the results must be paged. If null, no paging will be applied.

executeSingleResult

public U executeSingleResult(CommandContext commandContext)

addOrder

protected void addOrder(String column,
            String sortOrder,
            AbstractQuery.NullHandlingOnOrder nullHandlingOnOrder)

getOrderBy

public String getOrderBy()

Overrides:

getOrderBy in class ListQueryParameterObject

getDatabaseType

public String getDatabaseType()

Overrides:

getDatabaseType in class ListQueryParameterObject

setDatabaseType

public void setDatabaseType(String databaseType)

Overrides:

setDatabaseType in class ListQueryParameterObject