com.healthmarketscience.jackcess.impl

Class DBEvalContext

java.lang.Object

com.healthmarketscience.jackcess.impl.DBEvalContext

All Implemented Interfaces:

EvalConfig, Expressionator.ParseContext

public class DBEvalContext
extends Object
implements Expressionator.ParseContext, EvalConfig

Author:

James Ahlborn

Constructor Summary

Constructors

Constructor and Description
DBEvalContext(DatabaseImpl db)

Method Summary

Modifier and Type	Method and Description
SimpleDateFormat	createDateFormat(String formatStr)
Bindings	getBindings()
protected DatabaseImpl	getDatabase()
FunctionLookup	getFunctionLookup()
float	getRandom(Integer seed)
TemporalConfig	getTemporalConfig()
void	setBindings(Bindings bindings) Allows for passing custom information into expression evaluation.
void	setFunctionLookup(FunctionLookup lookup) Sets the Function provider to use during expression evaluation.
void	setTemporalConfig(TemporalConfig temporal) Sets the TemporalConfig for use when evaluating expressions.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DBEvalContext

public DBEvalContext(DatabaseImpl db)

Method Detail

getDatabase

protected DatabaseImpl getDatabase()

getTemporalConfig

public TemporalConfig getTemporalConfig()

Specified by:

getTemporalConfig in interface EvalConfig

Specified by:

getTemporalConfig in interface Expressionator.ParseContext

Returns:

the currently configured TemporalConfig

setTemporalConfig

public void setTemporalConfig(TemporalConfig temporal)

Description copied from interface: EvalConfig

Sets the TemporalConfig for use when evaluating expressions. The default date/time formatting is US based, so this may need to be modified when interacting with Database instances from other locales.

Specified by:

setTemporalConfig in interface EvalConfig

getFunctionLookup

public FunctionLookup getFunctionLookup()

Specified by:

getFunctionLookup in interface EvalConfig

Specified by:

getFunctionLookup in interface Expressionator.ParseContext

Returns:

the currently configured FunctionLookup

setFunctionLookup

public void setFunctionLookup(FunctionLookup lookup)

Description copied from interface: EvalConfig

Sets the Function provider to use during expression evaluation. The Functions supported by the default FunctionLookup are documented in com.healthmarketscience.jackcess.expr. Custom Functions can be implemented and provided to the expression evaluation engine by installing a custom FunctionLookup instance (which would presumably wrap and delegate to the default FunctionLookup instance for any default implementations).

Specified by:

setFunctionLookup in interface EvalConfig

getBindings

public Bindings getBindings()

Specified by:

getBindings in interface EvalConfig

Returns:

the currently configured Bindings

setBindings

public void setBindings(Bindings bindings)

Description copied from interface: EvalConfig

Allows for passing custom information into expression evaluation. Currently, none of the default implementations make use of the Bindings. However, in the future, customization parameters could potentially be supported via custom Bindings. Additionally, custom Function instances could be passed external information via custom Bindings.

Specified by:

setBindings in interface EvalConfig

createDateFormat

public SimpleDateFormat createDateFormat(String formatStr)

Specified by:

createDateFormat in interface Expressionator.ParseContext

getRandom

public float getRandom(Integer seed)