com.edorasware.commons.core.query.entity

Class VersionOperand

java.lang.Object

com.edorasware.commons.core.query.BasicOperand<T>

com.edorasware.commons.core.query.NumberOperand<Integer>

com.edorasware.commons.core.query.entity.VersionOperand

public final class VersionOperand
extends NumberOperand<Integer>

An operand implementation for version fields which builds Predicate instances through integer-specific operators. In addition, this operand allows to build a Predicate instance that tests for the latest, i.e. highest, value of a version field.

Nested Class Summary

Nested classes/interfaces inherited from class com.edorasware.commons.core.query.BasicOperand

BasicOperand.InnerSelectReferenceValue

Field Summary

Fields inherited from class com.edorasware.commons.core.query.BasicOperand

constructionInterceptor, queryParameter

Constructor Summary

Constructors

Constructor and Description
VersionOperand(QueryParameter queryParameter) Creates a new operand instance.

Method Summary

Modifier and Type	Method and Description
Predicate	latest() Builds a predicate representing a version = max(all version values) comparison.
Predicate	latest(Predicate aggregationPredicate) Builds a predicate representing a version = max(all version values matching aggregationPredicate) comparison.

Methods inherited from class com.edorasware.commons.core.query.NumberOperand

greaterThan, greaterThanOrEq, lessThan, lessThanOrEq

Methods inherited from class com.edorasware.commons.core.query.BasicOperand

eq, eq, eq, in, in, in, in, in, in, in, interceptPredicate, interceptValue, isNotNull, isNull, orderAsc, orderDesc

Methods inherited from class java.lang.Object

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

Constructor Detail

VersionOperand

public VersionOperand(QueryParameter queryParameter)

Creates a new operand instance.

Parameters:

queryParameter - the left operand for all predicates to be built

Method Detail

latest

public Predicate latest()

Builds a predicate representing a version = max(all version values) comparison.

Returns:

the new predicate instance

latest

public Predicate latest(Predicate aggregationPredicate)

Builds a predicate representing a version = max(all version values matching aggregationPredicate) comparison.

Parameters:

aggregationPredicate - the predicate determining which values to use for the 'max' aggregation

Returns:

the new predicate instance