com.querydsl.core.group

Class GroupByBuilder<K>

java.lang.Object

com.querydsl.core.group.GroupByBuilder<K>

Type Parameters:

K -

Direct Known Subclasses:

GuavaGroupByBuilder

public class GroupByBuilder<K>
extends java.lang.Object

GroupByBuilder is a fluent builder for GroupBy transformer instances. This class is not to be used directly, but via GroupBy.

Author:

tiwe

Field Summary

Fields

Modifier and Type	Field and Description
protected Expression<K>	key

Constructor Summary

Constructors

Constructor and Description
GroupByBuilder(Expression<K> key) Create a new GroupByBuilder for the given key expression

Method Summary

Modifier and Type	Method and Description
ResultTransformer<java.util.Map<K,Group>>	as(Expression<?>... expressions) Get the results as a map
<V> ResultTransformer<java.util.Map<K,V>>	as(Expression<V> expression) Get the results as a map
<V> ResultTransformer<java.util.Map<K,V>>	as(FactoryExpression<V> expression) Get the results as a map
<RES extends java.util.Map<K,Group>> ResultTransformer<RES>	as(java.util.function.Supplier<RES> mapFactory, Expression<?>... expressions) Get the results as a map
<V,RES extends java.util.Map<K,V>> ResultTransformer<RES>	as(java.util.function.Supplier<RES> mapFactory, Expression<V> expression) Get the results as a map
<RES extends java.util.Collection<Group>> ResultTransformer<RES>	collection(java.util.function.Supplier<RES> resultFactory, Expression<?>... expressions) Get the results as a collection.
<V,RES extends java.util.Collection<V>> ResultTransformer<RES>	collection(java.util.function.Supplier<RES> resultFactory, Expression<V> expression) Get the results as a set
<V,RES extends java.util.Collection<V>> ResultTransformer<RES>	collection(java.util.function.Supplier<RES> resultFactory, FactoryExpression<V> expression) Get the results as a list
protected <V> Expression<V>	getLookup(Expression<V> expression)
ResultTransformer<com.mysema.commons.lang.CloseableIterator<Group>>	iterate(Expression<?>... expressions) Get the results as a closeable iterator
<V> ResultTransformer<com.mysema.commons.lang.CloseableIterator<V>>	iterate(Expression<V> expression) Get the results as a closeable iterator
<V> ResultTransformer<com.mysema.commons.lang.CloseableIterator<V>>	iterate(FactoryExpression<V> expression) Get the results as a closeable iterator
ResultTransformer<java.util.List<Group>>	list(Expression<?>... expressions) Get the results as a list
<V> ResultTransformer<java.util.List<V>>	list(Expression<V> expression) Get the results as a list
<V> ResultTransformer<java.util.List<V>>	list(FactoryExpression<V> expression) Get the results as a list

Methods inherited from class java.lang.Object

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

Field Detail

key

protected final Expression<K> key

Constructor Detail

GroupByBuilder

public GroupByBuilder(Expression<K> key)

Create a new GroupByBuilder for the given key expression

Parameters:

key - key for aggregating

Method Detail

as

public ResultTransformer<java.util.Map<K,Group>> as(Expression<?>... expressions)

Get the results as a map

Parameters:

expressions - projection

Returns:

new result transformer

as

public <RES extends java.util.Map<K,Group>> ResultTransformer<RES> as(java.util.function.Supplier<RES> mapFactory,
                                                                      Expression<?>... expressions)

Get the results as a map

Parameters:

mapFactory - the map factory to use, i.e. HashMap::new.

expressions - projection

Returns:

new result transformer

iterate

public ResultTransformer<com.mysema.commons.lang.CloseableIterator<Group>> iterate(Expression<?>... expressions)

Get the results as a closeable iterator

Parameters:

expressions - projection

Returns:

new result transformer

list

public ResultTransformer<java.util.List<Group>> list(Expression<?>... expressions)

Get the results as a list

Parameters:

expressions - projection

Returns:

new result transformer

collection

public <RES extends java.util.Collection<Group>> ResultTransformer<RES> collection(java.util.function.Supplier<RES> resultFactory,
                                                                                   Expression<?>... expressions)

Get the results as a collection.

Parameters:

resultFactory - The collection factory to use, i.e. HashSet::new.

expressions - projection

Returns:

new result transformer

as

public <V> ResultTransformer<java.util.Map<K,V>> as(Expression<V> expression)

Get the results as a map

Parameters:

expression - projection

Returns:

new result transformer

as

public <V,RES extends java.util.Map<K,V>> ResultTransformer<RES> as(java.util.function.Supplier<RES> mapFactory,
                                                                    Expression<V> expression)

Get the results as a map

Parameters:

mapFactory - The map factory to use, i.e. HashMap::new.

expression - projection

Returns:

new result transformer

iterate

public <V> ResultTransformer<com.mysema.commons.lang.CloseableIterator<V>> iterate(Expression<V> expression)

Get the results as a closeable iterator

Parameters:

expression - projection

Returns:

new result transformer

list

public <V> ResultTransformer<java.util.List<V>> list(Expression<V> expression)

Get the results as a list

Parameters:

expression - projection

Returns:

new result transformer

collection

public <V,RES extends java.util.Collection<V>> ResultTransformer<RES> collection(java.util.function.Supplier<RES> resultFactory,
                                                                                 Expression<V> expression)

Get the results as a set

Parameters:

expression - projection

Returns:

new result transformer

getLookup

protected <V> Expression<V> getLookup(Expression<V> expression)

as

public <V> ResultTransformer<java.util.Map<K,V>> as(FactoryExpression<V> expression)

Get the results as a map

Parameters:

expression - projection

Returns:

new result transformer

iterate

public <V> ResultTransformer<com.mysema.commons.lang.CloseableIterator<V>> iterate(FactoryExpression<V> expression)

Get the results as a closeable iterator

Parameters:

expression - projection

Returns:

new result transformer

list

public <V> ResultTransformer<java.util.List<V>> list(FactoryExpression<V> expression)

Get the results as a list

Parameters:

expression - projection

Returns:

new result transformer

collection

public <V,RES extends java.util.Collection<V>> ResultTransformer<RES> collection(java.util.function.Supplier<RES> resultFactory,
                                                                                 FactoryExpression<V> expression)

Get the results as a list

Parameters:

expression - projection

Returns:

new result transformer