de.ipcon.db.oql.predicate

Class BinaryExpressionEvaluator

java.lang.Object

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

de.ipcon.db.oql.predicate.BinaryExpressionEvaluator

All Implemented Interfaces:

OQLExpressionEvaluatorI<BinaryExpressionNode>

public class BinaryExpressionEvaluator
extends ExpressionEvalBase<BinaryExpressionNode>

Evaluates the result of any binary expression by calculating the right and left value first and then applying the operator. Binary expressions in OQL can return one of 4 states internally:

• true
• false
• null - representing SQLs "UNKNOWN" state
• INNER_JOIN_FILTERED_OUT - the expression is filtered out due to an implicit inner join

Field Summary

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

INNER_JOIN_FILTERED_OUT

Constructor Summary

Constructors

Constructor and Description
BinaryExpressionEvaluator(OQLExpressionEvaluatorI<?> parent, BinaryExpressionNode 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.
java.lang.Object	handleNumeric(java.lang.Object left, java.lang.Object right, java.util.function.BiFunction<java.math.BigDecimal,java.math.BigDecimal,java.lang.Number> operator)
static java.lang.Boolean	ilike(java.lang.String str, java.lang.String pattern)
static java.lang.Boolean	like(java.lang.String str, java.lang.String pattern)
static java.lang.Boolean	like(java.lang.String str, java.lang.String pattern, boolean ignoreCase) Evaluates whether a string matches a SQL LIKE / ILIKE pattern (without using regex).

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

BinaryExpressionEvaluator

public BinaryExpressionEvaluator(OQLExpressionEvaluatorI<?> parent,
                                 BinaryExpressionNode node)
                          throws OQLException

Throws:

OQLException

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.

handleNumeric

public java.lang.Object handleNumeric(java.lang.Object left,
                                      java.lang.Object right,
                                      java.util.function.BiFunction<java.math.BigDecimal,java.math.BigDecimal,java.lang.Number> operator)

ilike

public static java.lang.Boolean ilike(java.lang.String str,
                                      java.lang.String pattern)

See Also:

with ignoreCase set to true

like

public static java.lang.Boolean like(java.lang.String str,
                                     java.lang.String pattern)

See Also:

with ignoreCase set to false

like

public static java.lang.Boolean like(java.lang.String str,
                                     java.lang.String pattern,
                                     boolean ignoreCase)

Evaluates whether a string matches a SQL LIKE / ILIKE pattern (without using regex).

Parameters:

str - The string to test, nullable.

pattern - The pattern to match against (supports '%' and '_', escaped by '\'), nullable.

ignoreCase - Set to true for ILIKE behavior, false for LIKE behavior.

Returns:

true if the string matches the pattern, false otherwise. null if either parameter is null (i.e. UNKNOWN)