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Cassandra support for Spring Data
/*
* Copyright 2013-2021 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.repository.support;
import java.lang.reflect.Method;
import java.util.Optional;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentEntity;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentProperty;
import org.springframework.data.cassandra.repository.CassandraRepository;
import org.springframework.data.cassandra.repository.query.CassandraEntityInformation;
import org.springframework.data.cassandra.repository.query.CassandraQueryMethod;
import org.springframework.data.cassandra.repository.query.PartTreeCassandraQuery;
import org.springframework.data.cassandra.repository.query.StringBasedCassandraQuery;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.projection.ProjectionFactory;
import org.springframework.data.repository.core.NamedQueries;
import org.springframework.data.repository.core.RepositoryInformation;
import org.springframework.data.repository.core.RepositoryMetadata;
import org.springframework.data.repository.core.support.RepositoryFactorySupport;
import org.springframework.data.repository.query.QueryLookupStrategy;
import org.springframework.data.repository.query.QueryLookupStrategy.Key;
import org.springframework.data.repository.query.QueryMethodEvaluationContextProvider;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Factory to create {@link CassandraRepository} instances.
*
* @author Alex Shvid
* @author Matthew T. Adams
* @author Thomas Darimont
* @author Mark Paluch
* @author John Blum
*/
public class CassandraRepositoryFactory extends RepositoryFactorySupport {
private static final SpelExpressionParser EXPRESSION_PARSER = new SpelExpressionParser();
private final MappingContext, CassandraPersistentProperty> mappingContext;
private final CassandraOperations operations;
/**
* Create a new {@link CassandraRepositoryFactory} with the given {@link CassandraOperations}.
*
* @param operations must not be {@literal null}
*/
public CassandraRepositoryFactory(CassandraOperations operations) {
Assert.notNull(operations, "CassandraOperations must not be null");
this.operations = operations;
this.mappingContext = operations.getConverter().getMappingContext();
}
/* (non-Javadoc)
* @see org.springframework.data.repository.core.support.RepositoryFactorySupport#getRepositoryBaseClass(org.springframework.data.repository.core.RepositoryMetadata)
*/
@Override
protected Class getRepositoryBaseClass(RepositoryMetadata metadata) {
return SimpleCassandraRepository.class;
}
/* (non-Javadoc)
* @see org.springframework.data.repository.core.support.RepositoryFactorySupport#getTargetRepository(org.springframework.data.repository.core.RepositoryInformation)
*/
@Override
protected Object getTargetRepository(RepositoryInformation information) {
CassandraEntityInformation entityInformation = getEntityInformation(information.getDomainType());
return getTargetRepositoryViaReflection(information, entityInformation, operations);
}
/* (non-Javadoc)
* @see org.springframework.data.repository.core.support.RepositoryFactorySupport#getEntityInformation(java.lang.Class)
*/
@Override
@SuppressWarnings("unchecked")
public CassandraEntityInformation getEntityInformation(Class domainClass) {
CassandraPersistentEntity entity = mappingContext.getRequiredPersistentEntity(domainClass);
return new MappingCassandraEntityInformation<>((CassandraPersistentEntity) entity, operations.getConverter());
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.core.support.RepositoryFactorySupport#getQueryLookupStrategy(Key, EvaluationContextProvider)
*/
@Override
protected Optional getQueryLookupStrategy(@Nullable Key key,
QueryMethodEvaluationContextProvider evaluationContextProvider) {
return Optional.of(new CassandraQueryLookupStrategy(operations, evaluationContextProvider, mappingContext));
}
private static class CassandraQueryLookupStrategy implements QueryLookupStrategy {
private final QueryMethodEvaluationContextProvider evaluationContextProvider;
private final MappingContext, CassandraPersistentProperty> mappingContext;
private final CassandraOperations operations;
private final ExpressionParser expressionParser = new CachingExpressionParser(EXPRESSION_PARSER);
CassandraQueryLookupStrategy(CassandraOperations operations,
QueryMethodEvaluationContextProvider evaluationContextProvider,
MappingContext, CassandraPersistentProperty> mappingContext) {
this.operations = operations;
this.evaluationContextProvider = evaluationContextProvider;
this.mappingContext = mappingContext;
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryLookupStrategy#resolveQuery(java.lang.reflect.Method, org.springframework.data.repository.core.RepositoryMetadata, org.springframework.data.projection.ProjectionFactory, org.springframework.data.repository.core.NamedQueries)
*/
@Override
public RepositoryQuery resolveQuery(Method method, RepositoryMetadata metadata, ProjectionFactory factory,
NamedQueries namedQueries) {
CassandraQueryMethod queryMethod = new CassandraQueryMethod(method, metadata, factory, mappingContext);
String namedQueryName = queryMethod.getNamedQueryName();
if (namedQueries.hasQuery(namedQueryName)) {
String namedQuery = namedQueries.getQuery(namedQueryName);
return new StringBasedCassandraQuery(namedQuery, queryMethod, operations, expressionParser,
evaluationContextProvider);
} else if (queryMethod.hasAnnotatedQuery()) {
return new StringBasedCassandraQuery(queryMethod, operations, expressionParser, evaluationContextProvider);
} else {
return new PartTreeCassandraQuery(queryMethod, operations);
}
}
}
}