com.mysema.query.types.expr
Class Coalesce<T extends Comparable>

java.lang.Object
  com.mysema.query.types.MutableExpressionBase<T>
      com.mysema.query.types.expr.Coalesce<T>

Type Parameters:

T - expression type

All Implemented Interfaces:

Expression<T>, Serializable

public class Coalesce<T extends Comparable>
extends MutableExpressionBase<T>

Coalesce defines a coalesce function invocation. The coalesce function returns null if all arguments are null and the first non-null argument otherwise

Coalesce doesn't provide the full interface for comparable expressions. To get an immutable copy with the full expressiveness of Comparable expressions, call getValue().

Author:

tiwe

See Also:

Serialized Form

Constructor Summary

Coalesce(Class<? extends T> type, Expression<?>... exprs)

Coalesce(Expression... exprs)

Method Summary

<R,C> R	accept(Visitor<R,C> v, C context) Accept the visitor with the given context
Coalesce<T>	add(Expression<T> expr)
Coalesce<T>	add(T constant)
DslExpression<T>	as(Path<T> alias) Create an alias for the expression
DslExpression<T>	as(String alias) Create an alias for the expression
BooleanExpression	asBoolean()
OrderSpecifier<T>	asc()
DateExpression<T>	asDate()
DateTimeExpression<T>	asDateTime()
EnumExpression<?>	asEnum()
NumberExpression<?>	asNumber()
StringExpression	asString()
TimeExpression<T>	asTime()
OrderSpecifier<T>	desc()
boolean	equals(Object o)
ComparableExpression<T>	getValue()

Methods inherited from class com.mysema.query.types.MutableExpressionBase

getType, hashCode, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Coalesce

public Coalesce(Class<? extends T> type,
                Expression<?>... exprs)

Coalesce

public Coalesce(Expression... exprs)

Method Detail

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:

getValue

public ComparableExpression<T> getValue()

as

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

Create an alias for the expression

Returns:

as

public DslExpression<T> as(String alias)

Create an alias for the expression

Returns:

add

public final Coalesce<T> add(Expression<T> expr)

asc

public OrderSpecifier<T> asc()

desc

public OrderSpecifier<T> desc()

add

public final Coalesce<T> add(T constant)

asBoolean

public BooleanExpression asBoolean()

asDate

public DateExpression<T> asDate()

asDateTime

public DateTimeExpression<T> asDateTime()

asEnum

public EnumExpression<?> asEnum()

asNumber

public NumberExpression<?> asNumber()

asString

public StringExpression asString()

asTime

public TimeExpression<T> asTime()

equals

public boolean equals(Object o)

Overrides:

equals in class Object