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Cassandra support for Spring Data
/*
* Copyright 2017-2023 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 java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.cassandra.core.mapping.CassandraMappingContext;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentEntity;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentProperty;
import org.springframework.data.convert.CustomConversions;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.mapping.model.EntityInstantiators;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.data.repository.query.ReturnedType;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Base class for Cassandra {@link RepositoryQuery} implementations providing common infrastructure such as
* {@link EntityInstantiators} and {@link QueryStatementCreator}.
*
* @author Mark Paluch
* @see org.springframework.data.repository.query.RepositoryQuery
* @since 2.0
*/
public abstract class CassandraRepositoryQuerySupport implements RepositoryQuery {
protected final Log log = LogFactory.getLog(getClass());
private final CassandraQueryMethod queryMethod;
private final EntityInstantiators instantiators;
private final QueryStatementCreator queryStatementCreator;
/**
* Create a new {@link AbstractCassandraQuery} from the given {@link CassandraQueryMethod} and
* {@link CassandraOperations}.
*
* @param queryMethod must not be {@literal null}.
* @deprecated use {@link #CassandraRepositoryQuerySupport(CassandraQueryMethod, MappingContext)}
*/
@Deprecated
public CassandraRepositoryQuerySupport(CassandraQueryMethod queryMethod) {
this(queryMethod, new CassandraMappingContext());
}
/**
* Create a new {@link AbstractCassandraQuery} from the given {@link CassandraQueryMethod} and
* {@link CassandraOperations}.
*
* @param queryMethod must not be {@literal null}.
* @param mappingContext must not be {@literal null}.
* @since 2.1
*/
public CassandraRepositoryQuerySupport(CassandraQueryMethod queryMethod,
MappingContext, CassandraPersistentProperty> mappingContext) {
Assert.notNull(queryMethod, "CassandraQueryMethod must not be null");
Assert.notNull(mappingContext, "CassandraMappingContext must not be null");
this.queryMethod = queryMethod;
this.instantiators = new EntityInstantiators();
this.queryStatementCreator = new QueryStatementCreator(queryMethod, mappingContext);
}
/* (non-Javadoc)
* @see org.springframework.data.repository.query.RepositoryQuery#getQueryMethod()
*/
@Override
public CassandraQueryMethod getQueryMethod() {
return this.queryMethod;
}
protected EntityInstantiators getEntityInstantiators() {
return this.instantiators;
}
protected QueryStatementCreator getQueryStatementCreator() {
return this.queryStatementCreator;
}
class CassandraReturnedType {
private final ReturnedType returnedType;
private final CustomConversions customConversions;
CassandraReturnedType(ReturnedType returnedType, CustomConversions customConversions) {
this.returnedType = returnedType;
this.customConversions = customConversions;
}
public Class getResultType() {
if (isProjecting()) {
return returnedType.getDomainType();
}
Class typeToRead = returnedType.getTypeToRead();
if (typeToRead == null) {
return returnedType.getReturnedType();
}
return typeToRead;
}
private boolean isProjecting() {
if (!this.returnedType.isProjecting()) {
return false;
}
// Spring Data Cassandra allows List