com.holonplatform.core.query

Interface QueryProjection<T>

Type Parameters:

T - Projection result type

All Superinterfaces:

Expression, TypedExpression<T>

All Known Subinterfaces:

BeanProjection<T>, BeanProperty<T>, BeanProperty.Builder<T>, BooleanBeanProperty, BooleanProperty, BooleanProperty.BooleanPropertyBuilder, CollectionPathProperty<E,C>, ConstantExpression<T>, CountAllProjection, ListPathProperty<T>, ListPathProperty.ListPathPropertyBuilder<T>, NumericBeanProperty<N>, NumericProperty<N>, NumericProperty.NumericPropertyBuilder<N>, PathExpression<T>, PathProperty<T>, PathProperty.PathPropertyBuilder<T>, PropertyBoxProperty, PropertyBoxProperty.PropertyBoxPropertyBuilder, PropertySetProjection, QueryFunction<T,A>, QueryFunction.Avg, QueryFunction.Count, QueryFunction.Max<T>, QueryFunction.Min<T>, QueryFunction.NoArgQueryFunction<T>, QueryFunction.PropertyQueryFunction<T,A>, QueryFunction.Sum<T>, SelectAllProjection, SetPathProperty<T>, SetPathProperty.SetPathPropertyBuilder<T>, StringBeanProperty, StringFunction, StringFunction.Lower, StringFunction.Upper, StringProperty, StringProperty.StringPropertyBuilder, TemporalBeanProperty<T>, TemporalFunction<T>, TemporalFunction.CurrentDate, TemporalFunction.CurrentLocalDate, TemporalFunction.CurrentLocalDateTime, TemporalFunction.CurrentTimestamp, TemporalFunction.Day, TemporalFunction.Hour, TemporalFunction.Month, TemporalFunction.Year, TemporalProperty<T>, TemporalProperty.TemporalPropertyBuilder<T>

public interface QueryProjection<T>
extends TypedExpression<T>

A query projection Expression to obtain typed query results.

Since:

5.0.0

Nested Class Summary

Nested classes/interfaces inherited from interface com.holonplatform.core.Expression

Expression.ExpressionResolverFunction<E extends Expression,R extends Expression>, Expression.InvalidExpressionException

Method Summary

Modifier and Type	Method and Description
static <T> QueryProjection<T>	bean(Class<? extends T> beanClass, Path<?>... selection) Create a QueryProjection using given bean class.
static <T> QueryProjection<T>	constant(T value) Create a QueryProjection for a constant value.
static QueryProjection<Long>	countAll() Create a query projection to count all the query results.
static <T> QueryProjection<T>	path(Path<T> path) Create a QueryProjection for a Path expression.
static <P extends Property> QueryProjection<PropertyBox>	propertySet(Iterable<P> properties) Create a PropertyBox type query projection using given properties as property set.
static QueryProjection<PropertyBox>	propertySet(Property<?>... properties) Create a PropertyBox type query projection using given properties as property set.

Methods inherited from interface com.holonplatform.core.TypedExpression

getTemporalType, getType, isCollectionExpression, isConverterExpression

Methods inherited from interface com.holonplatform.core.Expression

validate

Method Detail

constant

static <T> QueryProjection<T> constant(T value)

Create a QueryProjection for a constant value.

Type Parameters:

T - Expression type

Parameters:

value - Constant value

Returns:

A new constant expression projection

path

static <T> QueryProjection<T> path(Path<T> path)

Create a QueryProjection for a Path expression.

Type Parameters:

T - Path type

Parameters:

path - The Path expression (not null)

Returns:

A new path expression projection

propertySet

static QueryProjection<PropertyBox> propertySet(Property<?>... properties)

Create a PropertyBox type query projection using given properties as property set.

Parameters:

properties - The projection property set (not null)

Returns:

A new query projection using given properties as property set

propertySet

static <P extends Property> QueryProjection<PropertyBox> propertySet(Iterable<P> properties)

Create a PropertyBox type query projection using given properties as property set.

Type Parameters:

P - Property type

Parameters:

properties - The projection property set (not null)

Returns:

A new query projection using given properties as property set

bean

static <T> QueryProjection<T> bean(Class<? extends T> beanClass,
                                   Path<?>... selection)

Create a QueryProjection using given bean class.

Type Parameters:

T - Bean type

Parameters:

beanClass - The bean class (not null)

selection - Optional selection paths. If not provided, all valid bean property paths will be used.

Returns:

A new bean projection

countAll

static QueryProjection<Long> countAll()

Create a query projection to count all the query results.

Returns:

A new count all query projection of Long type