org.jsimpledb.parse.expr

Class JFieldValue

java.lang.Object

org.jsimpledb.parse.expr.AbstractValue

org.jsimpledb.parse.expr.JFieldValue

All Implemented Interfaces:

Value

Direct Known Subclasses:

JSimpleFieldValue

public class JFieldValue
extends AbstractValue

Value that reflects a JField in some JObject.

See Also:

FieldValue

Field Summary

Fields

Modifier and Type	Field and Description
protected JField	jfield
protected JObject	jobj

Fields inherited from interface org.jsimpledb.parse.expr.Value

EQ, GT, LT, NO_VALUE

Constructor Summary

Constructors

Constructor and Description
JFieldValue(JObject jobj, JField jfield) Constructor.

Method Summary

Modifier and Type	Method and Description
Object	get(ParseSession session) Evaluate this value within the given context.
Class<?>	getType(ParseSession session) Get the type of this value without evaluating it.

Methods inherited from class org.jsimpledb.parse.expr.AbstractValue

add, and, asLValue, checkBoolean, checkIntegral, checkNotNull, checkNumeric, checkType, compare, divide, invert, lshift, mod, multiply, negate, or, rshift, subtract, urshift, xor, xxcrement

Methods inherited from class java.lang.Object

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

Field Detail

jobj

protected final JObject jobj

jfield

protected final JField jfield

Constructor Detail

JFieldValue

public JFieldValue(JObject jobj,
                   JField jfield)

Constructor.

Parameters:

jobj - database object

jfield - database field

Throws:

IllegalArgumentException - if jobj is null

IllegalArgumentException - if jfield is null

Method Detail

get

public Object get(ParseSession session)

Description copied from interface: Value

Evaluate this value within the given context.

Normally this method should only be invoked once, and the result cached, because evaluation could have side effects.

Parameters:

session - parse session

Returns:

the evaluated result

getType

public Class<?> getType(ParseSession session)

Description copied from interface: Value

Get the type of this value without evaluating it.

This should perform a best-effort attempt to determine the type, but should not invoke get(). If the type is unknown, Object.class should be returned.

Specified by:

getType in interface Value

Overrides:

getType in class AbstractValue

Parameters:

session - parse session

Returns:

the expected type of the evaluated result