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Cassandra support for Spring Data
/*
* Copyright 2010-2022 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.query;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.convert.CassandraConverter;
import org.springframework.data.cassandra.core.mapping.CassandraMappingContext;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.CollectionExecution;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.ExistsExecution;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.ResultProcessingConverter;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.ResultProcessingExecution;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.ResultSetQuery;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.SingleEntityExecution;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.SlicedExecution;
import org.springframework.data.cassandra.repository.query.CassandraQueryExecution.StreamExecution;
import org.springframework.data.repository.query.ParameterAccessor;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.data.repository.query.ResultProcessor;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import com.datastax.oss.driver.api.core.cql.SimpleStatement;
import com.datastax.oss.driver.api.core.cql.Statement;
/**
* Base class for {@link RepositoryQuery} implementations for Cassandra.
*
* @author Mark Paluch
* @author John Blum
* @see org.springframework.data.cassandra.repository.query.CassandraRepositoryQuerySupport
*/
public abstract class AbstractCassandraQuery extends CassandraRepositoryQuerySupport {
private final CassandraOperations operations;
private static CassandraConverter toConverter(CassandraOperations operations) {
Assert.notNull(operations, "CassandraOperations must not be null");
return operations.getConverter();
}
private static CassandraMappingContext toMappingContext(CassandraOperations operations) {
return toConverter(operations).getMappingContext();
}
/**
* Create a new {@link AbstractCassandraQuery} from the given {@link CassandraQueryMethod} and
* {@link CassandraOperations}.
*
* @param queryMethod must not be {@literal null}.
* @param operations must not be {@literal null}.
*/
public AbstractCassandraQuery(CassandraQueryMethod queryMethod, CassandraOperations operations) {
super(queryMethod, toMappingContext(operations));
this.operations = operations;
}
/**
* Return a reference to the {@link CassandraOperations} used to execute this Cassandra query.
*
* @return a reference to the {@link CassandraOperations} used to execute this Cassandra query.
* @see org.springframework.data.cassandra.core.CassandraOperations
*/
protected CassandraOperations getOperations() {
return this.operations;
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.RepositoryQuery#execute(java.lang.Object[])
*/
@Nullable
@Override
public Object execute(Object[] parameters) {
CassandraParameterAccessor parameterAccessor = new ConvertingParameterAccessor(toConverter(getOperations()),
new CassandraParametersParameterAccessor(getQueryMethod(), parameters));
ResultProcessor resultProcessor = getQueryMethod().getResultProcessor().withDynamicProjection(parameterAccessor);
Statement statement = createQuery(parameterAccessor);
CassandraQueryExecution queryExecution = getExecution(parameterAccessor,
new ResultProcessingConverter(resultProcessor, toMappingContext(getOperations()), getEntityInstantiators()));
Class resultType = resolveResultType(resultProcessor);
return queryExecution.execute(statement, resultType);
}
private Class resolveResultType(ResultProcessor resultProcessor) {
CassandraReturnedType returnedType = new CassandraReturnedType(resultProcessor.getReturnedType(),
getOperations().getConverter().getCustomConversions());
return returnedType.isProjecting() ? returnedType.getDomainType() : returnedType.getReturnedType();
}
/**
* Creates a {@link Statement} using the given {@link ParameterAccessor}
*
* @param accessor must not be {@literal null}.
*/
protected abstract SimpleStatement createQuery(CassandraParameterAccessor accessor);
/**
* Returns the execution instance to use.
*
* @param parameterAccessor must not be {@literal null}.
* @param resultProcessing must not be {@literal null}.
* @return a wrapped {@link CassandraQueryExecution} to execute this query method.
*/
private CassandraQueryExecution getExecution(CassandraParameterAccessor parameterAccessor,
Converter