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Cassandra support for Spring Data
/*
* Copyright 2013-2018 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
*
* http://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;
/**
* Default implementation for Cassandra Persistent Entity Verification. Ensures that annotated
* {@link CassandraPersistentEntity entities} will map properly to a Cassandra Table.
*
* @author Matthew T Adams
* @author David Webb
* @author John Blum
* @author Mark Paluch
* @see Table
* @see PrimaryKey
* @see Id
*/
public class BasicCassandraPersistentEntityMetadataVerifier 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.isAnnotationPresent(Table.class)) {
return;
}
List exceptions = new ArrayList<>();
List idProperties = new ArrayList<>();
List partitionKeyColumns = new ArrayList<>();
List primaryKeyColumns = new ArrayList<>();
// @Indexed not allowed on type level
if (entity.isAnnotationPresent(Indexed.class)) {
exceptions.add(new MappingException("@Indexed cannot be used on entity classes"));
}
// Ensure entity is not both a @Table(@Persistent) and a @PrimaryKeyClass
if (entity.isCompositePrimaryKey()) {
exceptions.add(new MappingException(String.format("Entity cannot be of type @%s and @%s",
Table.class.getSimpleName(), PrimaryKeyClass.class.getSimpleName())));
}
// Parse entity properties
entity.forEach(property -> {
if (property.isIdProperty()) {
idProperties.add(property);
} else if (property.isClusterKeyColumn()) {
primaryKeyColumns.add(property);
} else if (property.isPartitionKeyColumn()) {
partitionKeyColumns.add(property);
primaryKeyColumns.add(property);
}
});
/*
* Perform rules verification on Table/Persistent
*/
// Ensure only one PK or at least one partitioned PK Column and not both PK(s) & PK Column(s) exist
if (primaryKeyColumns.isEmpty()) {
// Can only have one PK
if (idProperties.size() != 1) {
exceptions.add(new MappingException(
String.format("@%s types must have only one primary attribute, if any; Found %s",
Table.class.getSimpleName(), idProperties.size())));
fail(entity, exceptions);
}
}
if (!idProperties.isEmpty() && !primaryKeyColumns.isEmpty()) {
// Then we have both PK(s) & PK Column(s)
exceptions.add(new MappingException(String.format("@%s types must not define both @%s and @%s properties",
Table.class.getSimpleName(), Id.class.getSimpleName(), PrimaryKeyColumn.class.getSimpleName())));
fail(entity, exceptions);
}
// We have no PKs & only PK Column(s); ensure at least one is of type PARTITIONED
if (!primaryKeyColumns.isEmpty() && partitionKeyColumns.isEmpty()) {
exceptions.add(new MappingException(
String.format("At least one of the @%s annotations must have a type of PARTITIONED",
PrimaryKeyColumn.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);
}
}