EvalContext (Jackcess 5.0.0 API)

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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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, getLocale, 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.