net.kaczmarzyk.spring.data.jpa.domain

Class EmptyResultOnTypeMismatch<T>

java.lang.Object

net.kaczmarzyk.spring.data.jpa.domain.EmptyResultOnTypeMismatch<T>

All Implemented Interfaces:

org.springframework.data.jpa.domain.Specification<T>

public class EmptyResultOnTypeMismatch<T>
extends Object
implements org.springframework.data.jpa.domain.Specification<T>

Wrapper that turns a Specification into a one that always produces in an empty result (i.e. where 0 = 1) in case of a type mismatch (e.g. when type on path is Long and the value from the HTTP parameter is not a numeric.

It's useful for polymorphic "OR" queries such as where id = ? or name = ?. A spec will be wrapped with this decorator if onTypeMismatch property of @Spec is explicitly set to OnTypeMismatch.EMPTY_RESULT, i.e.: @Spec(path="id", onTypeMismatch=EMPTY_RESULT).

Author:

Tomasz Kaczmarzyk

See Also:

OnTypeMismatch

Constructor Summary

Constructors

Constructor and Description
EmptyResultOnTypeMismatch(org.springframework.data.jpa.domain.Specification<T> wrappedSpec)

Method Summary

Modifier and Type	Method and Description
org.springframework.data.jpa.domain.Specification<T>	getWrappedSpec()
javax.persistence.criteria.Predicate	toPredicate(javax.persistence.criteria.Root<T> root, javax.persistence.criteria.CriteriaQuery<?> query, javax.persistence.criteria.CriteriaBuilder cb)

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyResultOnTypeMismatch

public EmptyResultOnTypeMismatch(org.springframework.data.jpa.domain.Specification<T> wrappedSpec)

Method Detail

toPredicate

public javax.persistence.criteria.Predicate toPredicate(javax.persistence.criteria.Root<T> root,
                                                        javax.persistence.criteria.CriteriaQuery<?> query,
                                                        javax.persistence.criteria.CriteriaBuilder cb)

Specified by:

toPredicate in interface org.springframework.data.jpa.domain.Specification<T>

getWrappedSpec

public org.springframework.data.jpa.domain.Specification<T> getWrappedSpec()