Package com.querydsl.core.types

Class Projections

java.lang.Object

com.querydsl.core.types.Projections

public final class Projections
extends Object

Factory class for FactoryExpression instances

Author:

tiwe

Method Summary

Modifier and Type	Method	Description
static <T> com.querydsl.core.types.AppendingFactoryExpression<T>	appending(Expression<T> base, Expression<?>... rest)	Create an appending factory expression which serializes all the arguments but the uses the base value as the return value
static <T> ArrayConstructorExpression<T>	array(Class<T[]> type, Expression<T>... exprs)	Create a typed array projection for the given type and expressions
static <T> QBean<T>	bean(Path<? extends T> type, Expression<?>... exprs)	Create a Bean populating projection for the given type and expressions
static <T> QBean<T>	bean(Path<? extends T> type, Map<String,? extends Expression<?>> bindings)	Create a Bean populating projection for the given type and bindings
static <T> QBean<T>	bean(Class<? extends T> type, Expression<?>... exprs)	Create a Bean populating projection for the given type and expressions
static <T> QBean<T>	bean(Class<? extends T> type, Map<String,? extends Expression<?>> bindings)	Create a Bean populating projection for the given type and bindings
static <T> ConstructorExpression<T>	constructor(Class<? extends T> type, Expression<?>... exprs)	Create a constructor invocation projection for the given type and expressions
static <T> ConstructorExpression<T>	constructor(Class<? extends T> type, Class<?>[] paramTypes, Expression<?>... exprs)	Create a constructor invocation projection for given type, parameter types and expressions
static <T> ConstructorExpression<T>	constructor(Class<? extends T> type, Class<?>[] paramTypes, List<Expression<?>> exprs)	Create a constructor invocation projection for given type, parameter types and expressions
static <T> QBean<T>	fields(Path<? extends T> type, Expression<?>... exprs)	Create a field access based Bean populating projection for the given type and expressions
static <T> QBean<T>	fields(Path<? extends T> type, Map<String,? extends Expression<?>> bindings)	Create a field access based Bean populating projection for the given type and bindings
static <T> QBean<T>	fields(Class<? extends T> type, Expression<?>... exprs)	Create a field access based Bean populating projection for the given type and expressions
static <T> QBean<T>	fields(Class<? extends T> type, Map<String,? extends Expression<?>> bindings)	Create a field access based Bean populating projection for the given type and bindings
static QList	list(Expression<?>... args)	Create a new List typed projection for the given expressions
static QList	list(Expression<?>[]... args)	Create a new List typed projection for the given expressions
static QList	list(List<Expression<?>> args)	Create a new List typed projection for the given expressions
static QMap	map(Expression<?>... exprs)	Create a Map typed projection for the given expressions
static QTuple	tuple(Expression<?>... exprs)	Create a Tuple typed projection for the given expressions
static QTuple	tuple(Expression<?>[]... exprs)	Create a Tuple typed projection for the given expressions
static QTuple	tuple(List<Expression<?>> exprs)	Create a Tuple typed projection for the given expressions

Methods inherited from class java.lang.Object

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

Method Details

array

public static <T> ArrayConstructorExpression<T> array(Class<T[]> type,
 Expression<T>... exprs)

Create a typed array projection for the given type and expressions

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

exprs - arguments for the projection

Returns:

factory expression

appending

public static <T>
com.querydsl.core.types.AppendingFactoryExpression<T> appending(Expression<T> base,
 Expression<?>... rest)

Create an appending factory expression which serializes all the arguments but the uses the base value as the return value

Type Parameters:

T - type of projection

Parameters:

base - first argument

rest - additional arguments

Returns:

factory expression

bean

public static <T> QBean<T> bean(Class<? extends T> type,
 Expression<?>... exprs)

Create a Bean populating projection for the given type and expressions

Example

 UserDTO dto = query.select(
     Projections.bean(UserDTO.class, user.firstName, user.lastName));
 

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

exprs - arguments for the projection

Returns:

factory expression

bean

public static <T> QBean<T> bean(Path<? extends T> type,
 Expression<?>... exprs)

Create a Bean populating projection for the given type and expressions

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

exprs - arguments for the projection

Returns:

factory expression

bean

public static <T> QBean<T> bean(Path<? extends T> type,
 Map<String,? extends Expression<?>> bindings)

Create a Bean populating projection for the given type and bindings

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

bindings - property bindings

Returns:

factory expression

bean

public static <T> QBean<T> bean(Class<? extends T> type,
 Map<String,? extends Expression<?>> bindings)

Create a Bean populating projection for the given type and bindings

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

bindings - property bindings

Returns:

factory expression

constructor

public static <T> ConstructorExpression<T> constructor(Class<? extends T> type,
 Expression<?>... exprs)

Create a constructor invocation projection for the given type and expressions

Example

 UserDTO dto = query.singleResult(
     Projections.constructor(UserDTO.class, user.firstName, user.lastName));
 

Type Parameters:

T - type projection

Parameters:

type - type of the projection

exprs - arguments for the projection

Returns:

factory expression

constructor

public static <T> ConstructorExpression<T> constructor(Class<? extends T> type,
 Class<?>[] paramTypes,
 Expression<?>... exprs)

Create a constructor invocation projection for given type, parameter types and expressions

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

paramTypes - constructor parameter types

exprs - constructor parameters

Returns:

factory expression

constructor

public static <T> ConstructorExpression<T> constructor(Class<? extends T> type,
 Class<?>[] paramTypes,
 List<Expression<?>> exprs)

Create a constructor invocation projection for given type, parameter types and expressions

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

paramTypes - constructor parameter types

exprs - constructor parameters

Returns:

factory expression

fields

public static <T> QBean<T> fields(Class<? extends T> type,
 Expression<?>... exprs)

Create a field access based Bean populating projection for the given type and expressions

Example

 UserDTO dto = query.singleResult(
     Projections.fields(UserDTO.class, user.firstName, user.lastName));
 

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

exprs - arguments for the projection

Returns:

factory expression

fields

public static <T> QBean<T> fields(Path<? extends T> type,
 Expression<?>... exprs)

Create a field access based Bean populating projection for the given type and expressions

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

exprs - arguments for the projection

Returns:

factory expression

fields

public static <T> QBean<T> fields(Path<? extends T> type,
 Map<String,? extends Expression<?>> bindings)

Create a field access based Bean populating projection for the given type and bindings

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

bindings - field bindings

Returns:

factory expression

fields

public static <T> QBean<T> fields(Class<? extends T> type,
 Map<String,? extends Expression<?>> bindings)

Create a field access based Bean populating projection for the given type and bindings

Type Parameters:

T - type of projection

Parameters:

type - type of the projection

bindings - field bindings

Returns:

factory expression

list

public static QList list(Expression<?>... args)

Create a new List typed projection for the given expressions

Parameters:

args - list elements

Returns:

factory expression

list

public static QList list(List<Expression<?>> args)

Create a new List typed projection for the given expressions

Parameters:

args - list elements

Returns:

factory expression

list

public static QList list(Expression<?>[]... args)

Create a new List typed projection for the given expressions

Parameters:

args - list elements

Returns:

factory expression

map

public static QMap map(Expression<?>... exprs)

Create a Map typed projection for the given expressions

Example

 Map<Expression<?>, ?> map = query.select(
      Projections.map(user.firstName, user.lastName));
 

Parameters:

exprs - arguments for the projection

Returns:

factory expression

tuple

public static QTuple tuple(Expression<?>... exprs)

Create a Tuple typed projection for the given expressions

Parameters:

exprs - arguments for the projection

Returns:

factory expression

tuple

public static QTuple tuple(List<Expression<?>> exprs)

Create a Tuple typed projection for the given expressions

Parameters:

exprs - arguments for the projection

Returns:

factory expression

tuple

public static QTuple tuple(Expression<?>[]... exprs)

Create a Tuple typed projection for the given expressions

Parameters:

exprs - arguments for the projection

Returns:

factory expression