com.querydsl.core.types

Class ConstructorExpression<T>

java.lang.Object

com.querydsl.core.types.ExpressionBase<T>

com.querydsl.core.types.FactoryExpressionBase<T>

com.querydsl.core.types.ConstructorExpression<T>

Type Parameters:

T - expression type

All Implemented Interfaces:

Expression<T>, FactoryExpression<T>, Serializable

Direct Known Subclasses:

QPair

@Immutable
public class ConstructorExpression<T>
extends FactoryExpressionBase<T>

ConstructorExpression represents a constructor invocation

Example

 
 QEmployee employee = QEmployee.employee;
 List<EmployeeInfo> result = query.from(employee)
   .where(employee.valid.eq(true))
   .select(Projections.constructor(EmployeeInfo.class, employee.firstName, employee.lastName))
   .fetch();
 
 

Author:

tiwe

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ConstructorExpression(Class<? extends T> type, Class<?>[] paramTypes, Expression<?>... args)
protected	ConstructorExpression(Class<? extends T> type, Class<?>[] paramTypes, com.google.common.collect.ImmutableList<Expression<?>> args)
protected	ConstructorExpression(Class<? extends T> type, Expression<?>... args)

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
Expression<T>	as(Path<T> alias) Create an alias for the expression
Expression<T>	as(String alias) Create an alias for the expression
boolean	equals(Object obj)
List<Expression<?>>	getArgs() Get the invocation arguments
T	newInstance(Object... args) Create a projection with the given arguments

Methods inherited from class com.querydsl.core.types.FactoryExpressionBase

skipNulls

Methods inherited from class com.querydsl.core.types.ExpressionBase

getType, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.querydsl.core.types.Expression

getType

Constructor Detail

ConstructorExpression

protected ConstructorExpression(Class<? extends T> type,
                                Expression<?>... args)

ConstructorExpression

protected ConstructorExpression(Class<? extends T> type,
                                Class<?>[] paramTypes,
                                Expression<?>... args)

ConstructorExpression

protected ConstructorExpression(Class<? extends T> type,
                                Class<?>[] paramTypes,
                                com.google.common.collect.ImmutableList<Expression<?>> args)

Method Detail

as

public Expression<T> as(Path<T> alias)

Create an alias for the expression

Returns:

alias expression

as

public Expression<T> as(String alias)

Create an alias for the expression

Returns:

alias expression

accept

public <R,C> R accept(Visitor<R,C> v,
                      C context)

Description copied from interface: Expression

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

equals

public boolean equals(Object obj)

Overrides:

equals in class FactoryExpressionBase<T>

getArgs

public final List<Expression<?>> getArgs()

Description copied from interface: FactoryExpression

Get the invocation arguments

Returns:

argument expressions

newInstance

public T newInstance(Object... args)

Description copied from interface: FactoryExpression

Create a projection with the given arguments

Parameters:

args - row arguments

Returns:

constructed value