com.mysema.query.support

Class ProjectableQuery<Q extends ProjectableQuery<Q>>

java.lang.Object

com.mysema.query.support.QueryBase<Q>

com.mysema.query.support.ProjectableQuery<Q>

All Implemented Interfaces:

Projectable

Direct Known Subclasses:

AbstractCollQuery, AbstractJDOQuery, AbstractSQLQuery, AbstractSQLQuery, AbstractSQLQuery, JPAQueryBase

public abstract class ProjectableQuery<Q extends ProjectableQuery<Q>>
extends QueryBase<Q>
implements Projectable

ProjectableQuery extends the QueryBase class to provide default implementations of the methods of the Projectable interface

Author:

tiwe

Field Summary

Fields inherited from class com.mysema.query.support.QueryBase

queryMixin

Constructor Summary

Constructors

Constructor and Description
ProjectableQuery(QueryMixin<Q> queryMixin)

Method Summary

Methods

Modifier and Type	Method and Description
java.util.List<Tuple>	list(Expression<?>... args) list the results for the given projection An empty list is returned for no results.
<RT> java.util.List<RT>	list(Expression<RT> projection) list the results for the given projection An empty list is returned for no results.
<K,V> java.util.Map<K,V>	map(Expression<K> key, Expression<V> value) return the given projection as a Map instance using key and value for Map population An empty map is returned for no results.
boolean	notExists()
Tuple	singleResult(Expression<?>... args) return a single result for the given projection or null if no result is found
<RT> RT	singleResult(Expression<RT> expr) return a single result for the given projection or null if no result is found
<T> T	transform(ResultTransformer<T> transformer) Apply the given transformer to this Projectable instance and return the results
protected <T> T	uniqueResult(com.mysema.commons.lang.CloseableIterator<T> it)

Methods inherited from class com.mysema.query.support.QueryBase

distinct, equals, groupBy, groupBy, hashCode, having, having, limit, offset, orderBy, orderBy, restrict, set, toString, where, where

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.mysema.query.Projectable

count, exists, iterate, iterate, listResults, listResults, uniqueResult, uniqueResult

Constructor Detail

ProjectableQuery

public ProjectableQuery(QueryMixin<Q> queryMixin)

Method Detail

list

public java.util.List<Tuple> list(Expression<?>... args)

Description copied from interface: Projectable

list the results for the given projection An empty list is returned for no results.

Specified by:

list in interface Projectable

Returns:

list

public <RT> java.util.List<RT> list(Expression<RT> projection)

Description copied from interface: Projectable

list the results for the given projection An empty list is returned for no results.

Specified by:

list in interface Projectable

Type Parameters:

RT - generic type of the List

Returns:

a List over the projection

map

public final <K,V> java.util.Map<K,V> map(Expression<K> key,
                           Expression<V> value)

Description copied from interface: Projectable

return the given projection as a Map instance using key and value for Map population An empty map is returned for no results.

Specified by:

map in interface Projectable

Returns:

notExists

public final boolean notExists()

Specified by:

notExists in interface Projectable

Returns:

true, if no rows matching the given criteria exist, otherwise false

singleResult

public final Tuple singleResult(Expression<?>... args)

Description copied from interface: Projectable

return a single result for the given projection or null if no result is found

There is some ambiguity for missing results and null valued results, for disambiguation use the list or iterate methods instead.

for multiple results only the first one is returned

Specified by:

singleResult in interface Projectable

Returns:

singleResult

public final <RT> RT singleResult(Expression<RT> expr)

Description copied from interface: Projectable

return a single result for the given projection or null if no result is found

There is some ambiguity for missing results and null valued results, for disambiguation use the list or iterate methods instead.

for multiple results only the first one is returned

Specified by:

singleResult in interface Projectable

Type Parameters:

RT - return type

Returns:

the result or null for an empty result

transform

public <T> T transform(ResultTransformer<T> transformer)

Description copied from interface: Projectable

Apply the given transformer to this Projectable instance and return the results

Specified by:

transform in interface Projectable

Returns:

uniqueResult

@Nullable
protected <T> T uniqueResult(com.mysema.commons.lang.CloseableIterator<T> it)