com.healthmarketscience.jackcess.expr

Interface EvalContext

All Superinterfaces:

LocaleContext

All Known Implementing Classes:

BaseEvalContext, CalcColEvalContext, ColDefaultValueEvalContext, ColEvalContext, ColValidatorEvalContext, RowEvalContext, RowValidatorEvalContext

public interface EvalContext
extends LocaleContext

EvalContext encapsulates all shared state for expression parsing and evaluation. It provides a bridge between the expression execution engine and the current Database.

Author:

James Ahlborn

Method Summary

Modifier and Type	Method and Description
Object	get(String key)
Bindings	getBindings()
Value	getIdentifierValue(Identifier identifier)
float	getRandom(Integer seed)
Value.Type	getResultType()
Value	getThisColumnValue()
void	put(String key, Object value) Sets the value of the given key to the given value in the currently configured Bindings.

Methods inherited from interface com.healthmarketscience.jackcess.expr.LocaleContext

createDateFormatter, createDecimalFormat, getNumericConfig, getTemporalConfig, getZoneId

Method Detail

getRandom

float getRandom(Integer seed)

Parameters:

seed - the seed for the random value, following the rules for the "Rnd" function

Returns:

a random value for the given seed following the statefulness rules for the "Rnd" function

getResultType

Value.Type getResultType()

Returns:

the expected type of the result value for the current expression evaluation (for "default value" and "calculated" expressions)

getThisColumnValue

Value getThisColumnValue()

Returns:

the value of the "current" column (for "field validator" expressions)

getIdentifierValue

Value getIdentifierValue(Identifier identifier)

Returns:

the value of the entity identified by the given identifier (for "calculated" and "row validator" expressions)

getBindings

Bindings getBindings()

Returns:

the currently configured Bindings (from the EvalConfig)

get

Object get(String key)

Returns:

the value of the current key from the currently configured Bindings

put

void put(String key,
         Object value)

Sets the value of the given key to the given value in the currently configured Bindings.