org.datanucleus.query.typesafe

Interface ComparableExpression<T>

Type Parameters:

T - Java type being represented here

All Superinterfaces:

Expression<T>

All Known Subinterfaces:

BooleanExpression, ByteExpression, CharacterExpression, DateExpression<T>, DateTimeExpression<T>, EnumExpression<T>, NumericExpression<T>, StringExpression, TemporalExpression<T>, TimeExpression<T>

All Known Implementing Classes:

BooleanExpressionImpl, ByteExpressionImpl, CharacterExpressionImpl, ComparableExpressionImpl, DateExpressionImpl, DateTimeExpressionImpl, EnumExpressionImpl, NumericExpressionImpl, StringExpressionImpl, TimeExpressionImpl

public interface ComparableExpression<T>
extends Expression<T>

Representation of an expression for a Java type that implements java.lang.Comparable. Nore that the methods taking Expression as an argument could have been defined to take ComparableExpression but that would then have prevented code like

 NumericExpression param = (NumericExpression)tq.parameter("criticalValue", Double.class);
 tq.filter(cand.value.lt(param));
 

and we would have had to cast the parameter to NumericExpression

Method Summary

Methods

Modifier and Type	Method and Description
OrderExpression	asc() Method to return an order expression for this expression in ascending order.
OrderExpression	desc() Method to return an order expression for this expression in descending order.
BooleanExpression	gt(ComparableExpression expr) Method returning whether this expression is greater than the other expression.
BooleanExpression	gt(T t) Method returning whether this expression is greater than the literal.
BooleanExpression	gteq(ComparableExpression expr) Method returning whether this expression is greater than or equal the other expression.
BooleanExpression	gteq(T t) Method returning whether this expression is greater than or equal the literal.
BooleanExpression	lt(ComparableExpression expr) Method returning whether this expression is less than the other expression.
BooleanExpression	lt(T t) Method returning whether this expression is less than the literal.
BooleanExpression	lteq(ComparableExpression expr) Method returning whether this expression is less than or equal the other expression.
BooleanExpression	lteq(T t) Method returning whether this expression is less than or equal the literal.
NumericExpression	max() Method to return a numeric expression representing the aggregated maximum of this expression.
NumericExpression	min() Method to return a numeric expression representing the aggregated minimum of this expression.

Methods inherited from interface org.datanucleus.query.typesafe.Expression

cast, count, countDistinct, eq, eq, instanceOf, ne, ne

Method Detail

lt

BooleanExpression lt(ComparableExpression expr)

Method returning whether this expression is less than the other expression.

Parameters:

expr - Other expression

Returns:

Whether this is less than the other

lt

BooleanExpression lt(T t)

Method returning whether this expression is less than the literal.

Parameters:

t - literal

Returns:

Whether this is less than the other

lteq

BooleanExpression lteq(ComparableExpression expr)

Method returning whether this expression is less than or equal the other expression.

Parameters:

expr - Other expression

Returns:

Whether this is less than or equal the other

lteq

BooleanExpression lteq(T t)

Method returning whether this expression is less than or equal the literal.

Parameters:

t - literal

Returns:

Whether this is less than or equal the other

gt

BooleanExpression gt(ComparableExpression expr)

Method returning whether this expression is greater than the other expression.

Parameters:

expr - Other expression

Returns:

Whether this is greater than the other

gt

BooleanExpression gt(T t)

Method returning whether this expression is greater than the literal.

Parameters:

t - literal

Returns:

Whether this is greater than the other

gteq

BooleanExpression gteq(ComparableExpression expr)

Method returning whether this expression is greater than or equal the other expression.

Parameters:

expr - Other expression

Returns:

Whether this is greater than or equal to the other

gteq

BooleanExpression gteq(T t)

Method returning whether this expression is greater than or equal the literal.

Parameters:

t - literal

Returns:

Whether this is greater than or equal to the other

min

NumericExpression min()

Method to return a numeric expression representing the aggregated minimum of this expression.

Returns:

Numeric expression for the minimum

max

NumericExpression max()

Method to return a numeric expression representing the aggregated maximum of this expression.

Returns:

Numeric expression for the maximum

asc

OrderExpression asc()

Method to return an order expression for this expression in ascending order.

Returns:

The order expression

desc

OrderExpression desc()

Method to return an order expression for this expression in descending order.

Returns:

The order expression