com.querydsl.core.types

Interface Expression<T>

Type Parameters:

T - expression type

All Superinterfaces:

java.io.Serializable

All Known Subinterfaces:

ArrayExpression<A,T>, CollectionExpression<T,E>, Constant<T>, EntityPath<T>, ExtendedSubQuery<T>, FactoryExpression<T>, GroupExpression<T,R>, ListExpression<E,Q>, MapExpression<K,V>, Operation<T>, ParameterizedExpression<T>, ParamExpression<T>, Path<T>, Predicate, SubQueryExpression<T>, TemplateExpression<T>

All Known Implementing Classes:

AbstractGroupExpression, ArrayConstructorExpression, ArrayPath, BeanPath, BooleanBuilder, BooleanExpression, BooleanOperation, BooleanPath, BooleanTemplate, Coalesce, CollectionExpressionBase, CollectionOperation, CollectionPath, CollectionPathBase, ComparableEntityPath, ComparableExpression, ComparableExpressionBase, ComparableOperation, ComparablePath, ComparableTemplate, ConstantHidingExpression, ConstantImpl, ConstructorExpression, DateExpression, DateOperation, DatePath, DateTemplate, DateTimeExpression, DateTimeOperation, DateTimePath, DateTimeTemplate, DslExpression, DslOperation, DslPath, DslTemplate, EntityPathBase, EnumConversion, EnumExpression, EnumOperation, EnumPath, EnumTemplate, ExpressionBase, FactoryExpressionBase, FactoryExpressionUtils.FactoryExpressionAdapter, FetchableSubQueryBase, ListPath, LiteralExpression, MapExpressionBase, MapPath, MappingProjection, MixinGroupExpression, MutableExpressionBase, NullExpression, NumberConversion, NumberConversions, NumberExpression, NumberOperation, NumberPath, NumberTemplate, OperationImpl, Param, ParameterizedPathImpl, ParamExpressionImpl, PathBuilder, PathImpl, PredicateOperation, PredicateTemplate, QBean, QList, QMap, QPair, QTuple, SetPath, SimpleExpression, SimpleOperation, SimplePath, SimpleTemplate, StringExpression, StringOperation, StringPath, StringTemplate, SubQueryExpressionImpl, TemplateExpressionImpl, TemporalExpression, TimeExpression, TimeOperation, TimePath, TimeTemplate

public interface Expression<T>
extends java.io.Serializable

Expression defines a general typed expression in a Query instance. The generic type parameter is a reference to the type the expression is bound to.

The central Expression subinterfaces are

• Constant - for constants such as Strings, numbers and entity instances
• FactoryExpression - for row based result processing
• Operation - for common supported operations and function calls
• ParamExpression - for bindable query parameters
• Path - for variables, properties and collection member access
• SubQueryExpression - for subqueries
• TemplateExpression - for custom syntax

Author:

tiwe

Method Summary

Modifier and Type	Method and Description
<R,C> R	accept(Visitor<R,C> v, C context) Accept the visitor with the given context
java.lang.Class<? extends T>	getType() Get the java type for this expression

Method Detail

accept

@Nullable
<R,C> R accept(Visitor<R,C> v,
                         @Nullable
                         C context)

Accept the visitor with the given context

Type Parameters:

R - return type

C - context type

Parameters:

v - visitor

context - context of visit

Returns:

result of visit

getType

java.lang.Class<? extends T> getType()

Get the java type for this expression

Returns:

type of expression