com.healthmarketscience.jackcess.impl

Class BaseEvalContext

java.lang.Object

com.healthmarketscience.jackcess.impl.BaseEvalContext

All Implemented Interfaces:

EvalContext

Direct Known Subclasses:

ColEvalContext, RowEvalContext

public abstract class BaseEvalContext
extends Object
implements EvalContext

Author:

James Ahlborn

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseEvalContext(DBEvalContext dbCtx)

Method Summary

Modifier and Type	Method and Description
void	collectIdentifiers(Collection<Identifier> identifiers)
SimpleDateFormat	createDateFormat(String formatStr)
Object	eval()
Object	get(String key)
Bindings	getBindings()
protected DatabaseImpl	getDatabase()
Value	getIdentifierValue(Identifier identifier)
float	getRandom(Integer seed)
Value.Type	getResultType()
TemporalConfig	getTemporalConfig()
Value	getThisColumnValue()
void	put(String key, Object value) Sets the value of the given key to the given value in the currently configured Bindings.
String	toString()
protected Value	toValue(Object val, DataType dType)
static Value.Type	toValueType(DataType dType)
protected abstract String	withErrorContext(String msg)

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseEvalContext

protected BaseEvalContext(DBEvalContext dbCtx)

Method Detail

getDatabase

protected DatabaseImpl getDatabase()

getTemporalConfig

public TemporalConfig getTemporalConfig()

Specified by:

getTemporalConfig in interface EvalContext

Returns:

the currently configured TemporalConfig (from the EvalConfig)

createDateFormat

public SimpleDateFormat createDateFormat(String formatStr)

Specified by:

createDateFormat in interface EvalContext

Returns:

an appropriately configured (i.e. TimeZone and other date/time flags) SimpleDateFormat for the given format.

getRandom

public float getRandom(Integer seed)

Specified by:

getRandom in interface EvalContext

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

public Value.Type getResultType()

Specified by:

getResultType in interface EvalContext

Returns:

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

getThisColumnValue

public Value getThisColumnValue()

Specified by:

getThisColumnValue in interface EvalContext

Returns:

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

getIdentifierValue

public Value getIdentifierValue(Identifier identifier)

Specified by:

getIdentifierValue in interface EvalContext

Returns:

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

getBindings

public Bindings getBindings()

Specified by:

getBindings in interface EvalContext

Returns:

the currently configured Bindings (from the EvalConfig)

get

public Object get(String key)

Specified by:

get in interface EvalContext

Returns:

the value of the current key from the currently configured Bindings

put

public void put(String key,
                Object value)

Description copied from interface: EvalContext

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

Specified by:

put in interface EvalContext

eval

public Object eval()
            throws IOException

Throws:

IOException

collectIdentifiers

public void collectIdentifiers(Collection<Identifier> identifiers)

toString

public String toString()

Overrides:

toString in class Object

toValue

protected Value toValue(Object val,
                        DataType dType)

toValueType

public static Value.Type toValueType(DataType dType)

withErrorContext

protected abstract String withErrorContext(String msg)