com.holonplatform.core

Interface ConstantConverterExpression<T,E>

Type Parameters:

T - Expression type

E - Constant value type

All Superinterfaces:

ConverterExpression<E>, Expression, TypedExpression<E>

All Known Subinterfaces:

CollectionConstantExpression<T>, ConstantExpression<T>

All Known Implementing Classes:

DefaultCollectionConstantExpression, DefaultConstantConverterExpression

public interface ConstantConverterExpression<T,E>
extends ConverterExpression<E>

An expression which represents a constant value and supports value conversion using an ExpressionValueConverter.

Since:

5.1.0

Nested Class Summary

Nested classes/interfaces inherited from interface com.holonplatform.core.Expression

Expression.ExpressionResolverFunction<E extends Expression,R extends Expression>, Expression.InvalidExpressionException

Method Summary

Modifier and Type	Method and Description
static <T> ConstantConverterExpression<T,T>	create(T value) Create a ConstantConverterExpression which represents a constant value, deriving the expression type from the value class.
static <T> ConstantConverterExpression<T,T>	create(T value, Class<? extends T> type) Create a ConstantConverterExpression which represents a constant value.
static <T> ConstantConverterExpression<T,T>	create(TypedExpression<T> expression, T value) Create a ConstantConverterExpression which represents a constant value, using given expression to inherit an ExpressionValueConverter, if available.
Object	getModelValue() Get the model data type value, using the ExpressionValueConverter to convert constant expression value, if available.
T	getValue() Get the constant expression value

Methods inherited from interface com.holonplatform.core.ConverterExpression

getExpressionValueConverter, getModelType, getModelValue

Methods inherited from interface com.holonplatform.core.TypedExpression

getTemporalType, getType, isCollectionExpression, isConverterExpression

Methods inherited from interface com.holonplatform.core.Expression

validate

Method Detail

getValue

T getValue()

Get the constant expression value

Returns:

The expression value

getModelValue

Object getModelValue()

Get the model data type value, using the ExpressionValueConverter to convert constant expression value, if available. If an ExpressionValueConverter is not available, the original expression value is returned.

Returns:

The model-converted expression value if an ExpressionValueConverter is available, otherwise getValue() is returned.

create

static <T> ConstantConverterExpression<T,T> create(T value)

Create a ConstantConverterExpression which represents a constant value, deriving the expression type from the value class.

Type Parameters:

T - Expression and value type

Parameters:

value - Constant value (not null)

Returns:

A new ConstantConverterExpression instance

create

static <T> ConstantConverterExpression<T,T> create(T value,
                                                   Class<? extends T> type)

Create a ConstantConverterExpression which represents a constant value.

Type Parameters:

T - Expression and value type

Parameters:

value - Constant value

type - Constant value type (not null)

Returns:

A new ConstantConverterExpression instance

create

static <T> ConstantConverterExpression<T,T> create(TypedExpression<T> expression,
                                                   T value)

Create a ConstantConverterExpression which represents a constant value, using given expression to inherit an ExpressionValueConverter, if available.

Type Parameters:

T - Expression and value type

Parameters:

expression - Expression form which to inherit an ExpressionValueConverter, if available (not null)

value - Constant value

Returns:

A new ConstantConverterExpression instance