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Cassandra support for Spring Data
/*
* Copyright 2016-2018 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 org.springframework.data.cassandra.core.cql.CqlIdentifier;
import org.springframework.data.mapping.MappingException;
import org.springframework.data.util.TypeInformation;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import com.datastax.driver.core.UserType;
/**
* {@link org.springframework.data.mapping.PersistentEntity} for a mapped user-defined type (UDT). A mapped UDT consists
* of a set of fields. Each field requires a data type that can be either a simple Cassandra type or an UDT.
*
* @author Mark Paluch
* @since 1.5
* @see UserDefinedType
*/
public class CassandraUserTypePersistentEntity extends BasicCassandraPersistentEntity {
private final UserTypeResolver resolver;
private final Object lock = new Object();
private volatile @Nullable UserType userType;
/**
* Create a new {@link CassandraUserTypePersistentEntity}.
*
* @param typeInformation must not be {@literal null}.
* @param verifier must not be {@literal null}.
* @param resolver must not be {@literal null}.
*/
public CassandraUserTypePersistentEntity(TypeInformation typeInformation,
CassandraPersistentEntityMetadataVerifier verifier, UserTypeResolver resolver) {
super(typeInformation, verifier);
Assert.notNull(resolver, "UserTypeResolver must not be null");
this.resolver = resolver;
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.mapping.BasicCassandraPersistentEntity#determineTableName()
*/
@Override
protected CqlIdentifier determineTableName() {
UserDefinedType annotation = findAnnotation(UserDefinedType.class);
if (annotation != null) {
return determineName(annotation.value(), annotation.forceQuote());
}
return super.determineTableName();
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.mapping.BasicCassandraPersistentEntity#isUserDefinedType()
*/
@Override
public boolean isUserDefinedType() {
return true;
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.mapping.BasicCassandraPersistentEntity#getUserType()
*/
@Override
public UserType getUserType() {
if (userType == null) {
synchronized (lock) {
if (userType == null) {
CqlIdentifier identifier = determineTableName();
UserType userType = resolver.resolveType(identifier);
if (userType == null) {
throw new MappingException(String.format("User type [%s] not found", identifier));
}
this.userType = userType;
}
}
}
return userType;
}
}