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DATACMNS-1053 - EntityInformation now exposes getRequiredId(…).

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Added EntityInformation.getRequiredId(…) that throws an exception if getId(…) returns an empty Optional.
This commit is contained in:
Oliver Gierke
2017-05-02 09:37:09 +02:00
parent b0177b2ab7
commit 357efe4551
1 changed files with 18 additions and 1 deletions
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19
src/main/java/org/springframework/data/repository/core/EntityInformation.java
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@@ -18,6 +18,8 @@ package org.springframework.data.repository.core;
import java.io.Serializable;
import java.util.Optional;
import org.springframework.util.Assert;
/**
* Extension of {@link EntityMetadata} to add functionality to query information of entity instances.
*
@@ -34,13 +36,28 @@ public interface EntityInformation<T, ID extends Serializable> extends EntityMet
boolean isNew(T entity);
/**
* Returns the id of the given entity.
* Returns the id of the given entity or {@link Optional#empty()} if none can be obtained.
*
* @param entity must never be {@literal null}
* @return
*/
Optional<ID> getId(T entity);
/**
* Returns the identifier of the given entity.
*
* @param entity must not be {@literal null}.
* @return the identifier of the given entity
* @throws IllegalArgumentException in case no id could be obtained from the given entity
*/
default ID getRequiredId(T entity) throws IllegalArgumentException {
Assert.notNull(entity, "Entity must not be null!");
return getId(entity).orElseThrow(() -> new IllegalArgumentException(
String.format("Could not obtain required identifier from entity %s!", entity)));
}
/**
* Returns the type of the id of the entity.
*