com.querydsl.collections

Class AbstractCollQuery<T,Q extends AbstractCollQuery<T,Q>>

java.lang.Object

com.querydsl.core.support.QueryBase<Q>

com.querydsl.core.support.FetchableQueryBase<T,Q>

com.querydsl.collections.AbstractCollQuery<T,Q>

Type Parameters:

T - result type

Q - concrete subtype

All Implemented Interfaces:

Fetchable<T>, FetchableQuery<T,Q>, FilteredClause<Q>, SimpleQuery<Q>

Direct Known Subclasses:

CollQuery

public abstract class AbstractCollQuery<T,Q extends AbstractCollQuery<T,Q>>
extends FetchableQueryBase<T,Q>
implements FetchableQuery<T,Q>

AbstractCollQuery provides a base class for Collection query implementations.

Author:

tiwe

See Also:

CollQuery

Field Summary

Fields inherited from class com.querydsl.core.support.QueryBase

MDC_PARAMETERS, MDC_QUERY, queryMixin

Constructor Summary

Constructors

Constructor and Description
AbstractCollQuery(QueryMetadata metadata, QueryEngine queryEngine)

Method Summary

Modifier and Type	Method and Description
<A> Q	bind(Path<A> entity, Iterable<? extends A> col) Bind the given collection to an already existing query source
List<T>	fetch() Get the projection as a typed List
long	fetchCount() Get the count of matched elements
T	fetchOne() Get the projection as a unique result or null if no result is found
QueryResults<T>	fetchResults() Get the projection in QueryResults form
<A> Q	from(Path<A> entity, Iterable<? extends A> col) Add a query source
protected QueryMetadata	getMetadata()
protected QueryEngine	getQueryEngine()
Q	groupBy(Expression<?>... o) Add grouping/aggregation expressions
Q	groupBy(Expression<?> e) Add a single grouping expression
Q	having(Predicate... e) Add filters for aggregation
Q	having(Predicate e) Add a single filter for aggregation
<P> Q	innerJoin(MapExpression<?,P> target, Path<P> alias) Define an inner join from the Map typed path to the alias
<P> Q	innerJoin(Path<? extends Collection<P>> target, Path<P> alias) Define an inner join from the Collection typed path to the alias
com.mysema.commons.lang.CloseableIterator<T>	iterate() Get the projection as a typed closeable Iterator
<P> Q	leftJoin(MapExpression<?,P> target, Path<P> alias) Define a left join from the Map typed path to the alias
<P> Q	leftJoin(Path<? extends Collection<P>> target, Path<P> alias) Define a left join from the Collection typed path to the alias

Methods inherited from class com.querydsl.core.support.FetchableQueryBase

equals, fetchFirst, transform, uniqueResult

Methods inherited from class com.querydsl.core.support.QueryBase

distinct, hashCode, 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.querydsl.core.FetchableQuery

select, select, transform

Methods inherited from interface com.querydsl.core.SimpleQuery

distinct, limit, offset, orderBy, restrict, set

Methods inherited from interface com.querydsl.core.FilteredClause

where

Methods inherited from interface com.querydsl.core.Fetchable

fetchFirst

Constructor Detail

AbstractCollQuery

public AbstractCollQuery(QueryMetadata metadata,
                         QueryEngine queryEngine)

Method Detail

fetchCount

public long fetchCount()

Description copied from interface: Fetchable

Get the count of matched elements

Specified by:

fetchCount in interface Fetchable<T>

Returns:

row count

getMetadata

protected QueryMetadata getMetadata()

from

public <A> Q from(Path<A> entity,
                  Iterable<? extends A> col)

Add a query source

Type Parameters:

A - type of expression

Parameters:

entity - Path for the source

col - content of the source

Returns:

current object

bind

public <A> Q bind(Path<A> entity,
                  Iterable<? extends A> col)

Bind the given collection to an already existing query source

Type Parameters:

A - type of expression

Parameters:

entity - Path for the source

col - content of the source

Returns:

current object

groupBy

public Q groupBy(Expression<?> e)

Description copied from class: QueryBase

Add a single grouping expression

Overrides:

groupBy in class QueryBase<Q extends AbstractCollQuery<T,Q>>

Parameters:

e - group by expression

Returns:

the current object

groupBy

public Q groupBy(Expression<?>... o)

Description copied from class: QueryBase

Add grouping/aggregation expressions

Overrides:

groupBy in class QueryBase<Q extends AbstractCollQuery<T,Q>>

Parameters:

o - group by expressions

Returns:

the current object

having

public Q having(Predicate e)

Description copied from class: QueryBase

Add a single filter for aggregation

Overrides:

having in class QueryBase<Q extends AbstractCollQuery<T,Q>>

Parameters:

e - having condition

Returns:

the current object

having

public Q having(Predicate... e)

Description copied from class: QueryBase

Add filters for aggregation

Overrides:

having in class QueryBase<Q extends AbstractCollQuery<T,Q>>

Parameters:

e - having conditions

Returns:

the current object

getQueryEngine

protected QueryEngine getQueryEngine()

innerJoin

public <P> Q innerJoin(Path<? extends Collection<P>> target,
                       Path<P> alias)

Define an inner join from the Collection typed path to the alias

Type Parameters:

P - type of expression

Parameters:

target - target of the join

alias - alias for the join target

Returns:

current object

innerJoin

public <P> Q innerJoin(MapExpression<?,P> target,
                       Path<P> alias)

Define an inner join from the Map typed path to the alias

Type Parameters:

P - type of expression

Parameters:

target - target of the join

alias - alias for the join target

Returns:

current object

leftJoin

public <P> Q leftJoin(Path<? extends Collection<P>> target,
                      Path<P> alias)

Define a left join from the Collection typed path to the alias

Type Parameters:

P - type of expression

Parameters:

target - target of the join

alias - alias for the join target

Returns:

current object

leftJoin

public <P> Q leftJoin(MapExpression<?,P> target,
                      Path<P> alias)

Define a left join from the Map typed path to the alias

Type Parameters:

P - type of expression

Parameters:

target - target of the join

alias - alias for the joint target

Returns:

current object

iterate

public com.mysema.commons.lang.CloseableIterator<T> iterate()

Description copied from interface: Fetchable

Get the projection as a typed closeable Iterator

Specified by:

iterate in interface Fetchable<T>

Returns:

closeable iterator

fetch

public List<T> fetch()

Description copied from interface: Fetchable

Get the projection as a typed List

Specified by:

fetch in interface Fetchable<T>

Overrides:

fetch in class FetchableQueryBase<T,Q extends AbstractCollQuery<T,Q>>

Returns:

results in list form

fetchResults

public QueryResults<T> fetchResults()

Description copied from interface: Fetchable

Get the projection in QueryResults form

Specified by:

fetchResults in interface Fetchable<T>

Returns:

results

fetchOne

public T fetchOne()

Description copied from interface: Fetchable

Get the projection as a unique result or null if no result is found

Specified by:

fetchOne in interface Fetchable<T>

Returns:

first result or null