org.apache.openjpa.persistence.criteria
Class CompareByExample<T>

java.lang.Object
  org.apache.openjpa.persistence.criteria.SelectionImpl<X>
      org.apache.openjpa.persistence.criteria.ExpressionImpl<Boolean>
          org.apache.openjpa.persistence.criteria.PredicateImpl
              org.apache.openjpa.persistence.criteria.CompareByExample<T>

All Implemented Interfaces:

Expression<Boolean>, Predicate, Selection<Boolean>, TupleElement<Boolean>, CriteriaExpression

 class CompareByExample<T>
extends PredicateImpl

An expression for query-by-example.

Author:

Pinaki Poddar

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.openjpa.persistence.criteria.PredicateImpl

PredicateImpl.And, PredicateImpl.Or

Nested classes/interfaces inherited from interface javax.persistence.criteria.Predicate

Predicate.BooleanOperator

Field Summary

Fields inherited from class org.apache.openjpa.persistence.criteria.PredicateImpl

_exps, FALSE, TRUE

Constructor Summary

CompareByExample(CriteriaBuilder builder, ManagedType<T> type, Path<T> from, T instance, ComparisonStyle style, Attribute<?,?>... excludes)

Method Summary

(package private) static <T> Predicate.BooleanOperator	extractOperator(ComparisonStyle style)
(package private) Object	extractValue(T instance, SingularAttribute<? super T,?> attr)
(package private) boolean	isDefaultValue(Class<?> cls, Object val)

Methods inherited from class org.apache.openjpa.persistence.criteria.PredicateImpl

acceptVisit, add, asValue, getExpressions, getOperator, isEmpty, isNegated, markNegated, not, toKernelExpression, toValue

Methods inherited from class org.apache.openjpa.persistence.criteria.ExpressionImpl

as, in, in, in, in, isNotNull, isNull

Methods inherited from class org.apache.openjpa.persistence.criteria.SelectionImpl

alias, asProjection, assertValidName, asVariable, getAlias, getCompoundSelectionItems, getJavaType, isAliased, isAutoAliased, isCompoundSelection, setAutoAlias

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.persistence.criteria.Expression

as, in, in, in, in, isNotNull, isNull

Methods inherited from interface javax.persistence.criteria.Selection

alias, getCompoundSelectionItems, isCompoundSelection

Methods inherited from interface javax.persistence.TupleElement

getAlias, getJavaType

Constructor Detail

CompareByExample

CompareByExample(CriteriaBuilder builder,
                 ManagedType<T> type,
                 Path<T> from,
                 T instance,
                 ComparisonStyle style,
                 Attribute<?,?>... excludes)

Method Detail

extractValue

Object extractValue(T instance,
                    SingularAttribute<? super T,?> attr)

isDefaultValue

boolean isDefaultValue(Class<?> cls,
                       Object val)

extractOperator

static <T> Predicate.BooleanOperator extractOperator(ComparisonStyle style)