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Cassandra support for Spring Data
/*
* Copyright 2016-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.cassandra.core.mapping;
import java.util.ArrayList;
import java.util.List;
import org.springframework.data.annotation.Id;
import org.springframework.data.mapping.MappingException;
/**
* {@link CassandraPersistentEntityMetadataVerifier} for {@link PrimaryKeyClass} entities. Ensures a valid mapping for
* composite primary keys.
*
* @author Mark Paluch
* @since 1.5
* @see PrimaryKeyClass
*/
public class PrimaryKeyClassEntityMetadataVerifier implements CassandraPersistentEntityMetadataVerifier {
/*
* (non-Javadoc)
* @see org.springframework.data.cassandra.core.mapping.CassandraPersistentEntityMetadataVerifier#verify(org.springframework.data.cassandra.core.mapping.CassandraPersistentEntity)
*/
@Override
public void verify(CassandraPersistentEntity entity) throws MappingException {
if (entity.getType().isInterface() || !entity.isCompositePrimaryKey()) {
return;
}
List exceptions = new ArrayList<>();
List idProperties = new ArrayList<>();
List compositePrimaryKeys = new ArrayList<>();
List partitionKeyColumns = new ArrayList<>();
List primaryKeyColumns = new ArrayList<>();
Class entityType = entity.getType();
// @Indexed not allowed on type level
if (entity.isAnnotationPresent(Indexed.class)) {
exceptions.add(new MappingException("@Indexed cannot be used on primary key classes"));
}
// Ensure entity is not both a @Table(@Persistent) and a @PrimaryKey
if (entity.isAnnotationPresent(Table.class)) {
exceptions.add(new MappingException(String.format("Entity cannot be of type @%s and @%s",
Table.class.getSimpleName(), PrimaryKeyClass.class.getSimpleName())));
}
// Ensure PrimaryKeyClass only extends Object
if (!entityType.getSuperclass().equals(Object.class)) {
exceptions.add(
new MappingException(String.format("@%s must only extend Object", PrimaryKeyClass.class.getSimpleName())));
}
entity.forEach(property -> {
if (property.isCompositePrimaryKey()) {
compositePrimaryKeys.add(property);
} else if (property.isIdProperty()) {
idProperties.add(property);
} else if (property.isClusterKeyColumn()) {
primaryKeyColumns.add(property);
} else if (property.isPartitionKeyColumn()) {
partitionKeyColumns.add(property);
primaryKeyColumns.add(property);
}
});
if (!compositePrimaryKeys.isEmpty()) {
exceptions
.add(new MappingException("Composite primary keys are not allowed inside of composite primary key classes"));
}
// Must have at least 1 attribute annotated with @PrimaryKeyColumn
if (primaryKeyColumns.isEmpty()) {
exceptions.add(
new MappingException(String.format("Composite primary key type [%1$s] has no fields annotated with @%2$s",
entity.getType().getName(), PrimaryKeyColumn.class.getSimpleName())));
}
// At least one of the PrimaryKeyColumns must have a type PARTIONED
if (partitionKeyColumns.isEmpty()) {
exceptions
.add(new MappingException(String.format("At least one of the @%s annotations must have a type of PARTITIONED",
PrimaryKeyColumn.class.getSimpleName())));
}
// Cannot have any Id or PrimaryKey Annotations
if (!idProperties.isEmpty()) {
exceptions.add(
new MappingException(String.format("Annotations @%1$s and @%2$s are invalid for type annotated with @%3$s",
Id.class.getSimpleName(), PrimaryKey.class.getSimpleName(), PrimaryKeyClass.class.getSimpleName())));
}
// Determine whether or not to throw Exception based on errors found
if (!exceptions.isEmpty()) {
fail(entity, exceptions);
}
}
private static void fail(CassandraPersistentEntity entity, List exceptions) {
throw new VerifierMappingExceptions(entity, exceptions);
}
}