Projections (Querydsl 4.1.3 API)

java.lang.Object
- com.querydsl.core.types.Projections

```
public final class Projections
extends Object
```
Factory class for FactoryExpression instances

Author:

tiwe

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and 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(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> 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> 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, com.google.common.collect.ImmutableList<Expression<?>> exprs)` Create a constructor invocation projection for given type, parameter types and expressions
`static <T> ConstructorExpression<T>`	`constructor(Class<? extends T> type, Expression<?>... exprs)` Create a constructor invocation projection for the given type and expressions
`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 <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 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(com.google.common.collect.ImmutableList<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(com.google.common.collect.ImmutableList<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 Detail
  - 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,
                                                       com.google.common.collect.ImmutableList<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(com.google.common.collect.ImmutableList<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(com.google.common.collect.ImmutableList<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

Class Projections

Method Summary

Methods inherited from class java.lang.Object

Method Detail

array

appending

bean

bean

bean

bean

constructor

constructor

constructor

fields

fields

fields

fields

list

list

list

map

tuple

tuple

tuple