de.ipcon.db.oql.predicate

Class LiteralEvaluator

java.lang.Object

de.ipcon.db.oql.predicate.ExpressionEvalBase<LiteralNode>

de.ipcon.db.oql.predicate.LiteralEvaluator

All Implemented Interfaces:

OQLExpressionEvaluatorI<LiteralNode>

public class LiteralEvaluator
extends ExpressionEvalBase<LiteralNode>

Evaluates a constant literal node

Field Summary

Fields inherited from interface de.ipcon.db.oql.predicate.OQLExpressionEvaluatorI

INNER_JOIN_FILTERED_OUT

Constructor Summary

Constructors

Constructor and Description
LiteralEvaluator(OQLExpressionEvaluatorI<?> parentPredicate, LiteralNode node)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	getValue(BOI bo) Computes the raw value of the expression evaluated on the provided BO.
boolean	isNull()

Methods inherited from class de.ipcon.db.oql.predicate.ExpressionEvalBase

getAlias, getChildren, getEntity, getNode, getParameters, getParent, getSchema, of

Methods inherited from class java.lang.Object

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

Constructor Detail

LiteralEvaluator

public LiteralEvaluator(OQLExpressionEvaluatorI<?> parentPredicate,
                        LiteralNode node)
                 throws UnsupportedQueryException

Throws:

UnsupportedQueryException

Method Detail

getValue

public java.lang.Object getValue(BOI bo)

Description copied from interface: OQLExpressionEvaluatorI

Computes the raw value of the expression evaluated on the provided BO. Can return a flat Collection (Sets preferred) if the evaluation contains a join and has multiple results due to the internally created cross-product.

Parameters:

bo - the nonnull root BO to evaluate the node on

Returns:

the raw value of the OQL expression that this predicate represents. Can be an arbitrary return value, e.g. Strings, Boolean, INNER_JOIN_FILTERED_OUT, null, etc.

isNull

public boolean isNull()