de.ipcon.db.oql.predicate

Class PathNodeEvaluator

java.lang.Object

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

de.ipcon.db.oql.predicate.PathNodeEvaluator

All Implemented Interfaces:

OQLExpressionEvaluatorI<PathNode>

public class PathNodeEvaluator
extends ExpressionEvalBase<PathNode>

Evaluates a Path in OQL, which might be an inner join that causes the whole WHERE clause to evaluate to false.

Field Summary

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

INNER_JOIN_FILTERED_OUT

Constructor Summary

Constructors

Constructor and Description
PathNodeEvaluator(OQLExpressionEvaluatorI<?> parent, PathNode node)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	extractValue(PathNode node, BOI bo, EntityI boEntity, java.lang.String alias)
java.lang.Object	extractValue(PathNode node, BOI bo, EntityI boEntity, java.lang.String alias, int startAt)
java.lang.Object	getValue(BOI bo) Computes the raw value of the expression evaluated on the provided BO.

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

PathNodeEvaluator

public PathNodeEvaluator(OQLExpressionEvaluatorI<?> parent,
                         PathNode 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.

extractValue

public java.lang.Object extractValue(PathNode node,
                                     BOI bo,
                                     EntityI boEntity,
                                     java.lang.String alias)

extractValue

public java.lang.Object extractValue(PathNode node,
                                     BOI bo,
                                     EntityI boEntity,
                                     java.lang.String alias,
                                     int startAt)