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Cassandra support for Spring Data
/*
* Copyright 2017-2018 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 static org.springframework.data.cassandra.core.cql.CqlIdentifier.*;
import org.springframework.data.cassandra.core.cql.CqlIdentifier;
import org.springframework.util.Assert;
import com.datastax.driver.core.DataType;
import com.datastax.driver.core.DataType.CollectionType;
import com.datastax.driver.core.DataType.Name;
import com.datastax.driver.core.UserType;
/**
* {@link com.datastax.driver.core.UserType} utility methods. Mainly for internal use within the framework.
*
* @author Mark Paluch
* @since 2.0
*/
class UserTypeUtil {
/**
* Potentially create a frozen variant of {@code dataType}. Frozen types are required for nested UDTs (a user-type
* referencing another user-type) or UDTs within collection types.
*
* @param dataType must not be {@literal null}.
* @return the potentially frozen {@link DataType}.
*/
static DataType potentiallyFreeze(DataType dataType) {
Assert.notNull(dataType, "DataType must not be null");
if (dataType.getName() == Name.LIST && dataType instanceof CollectionType) {
CollectionType collectionType = (CollectionType) dataType;
DataType typeArgument = collectionType.getTypeArguments().get(0);
if (typeArgument instanceof CollectionType || isNonFrozenUdt(typeArgument)) {
return DataType.list(potentiallyFreeze(typeArgument), collectionType.isFrozen());
}
}
if (dataType.getName() == Name.SET && dataType instanceof CollectionType) {
CollectionType collectionType = (CollectionType) dataType;
DataType typeArgument = collectionType.getTypeArguments().get(0);
if (typeArgument instanceof CollectionType || isNonFrozenUdt(typeArgument)) {
return DataType.set(potentiallyFreeze(typeArgument), collectionType.isFrozen());
}
}
if (dataType.getName() == Name.MAP && dataType instanceof CollectionType) {
CollectionType collectionType = (CollectionType) dataType;
DataType keyType = collectionType.getTypeArguments().get(0);
DataType valueType = collectionType.getTypeArguments().get(1);
if (keyType instanceof CollectionType || valueType instanceof CollectionType || isNonFrozenUdt(keyType)
|| isNonFrozenUdt(valueType)) {
return DataType.map(potentiallyFreeze(keyType), potentiallyFreeze(valueType), collectionType.isFrozen());
}
}
return isNonFrozenUdt(dataType) ? new FrozenLiteralDataType(getTypeName(dataType)) : dataType;
}
private static CqlIdentifier getTypeName(DataType dataType) {
if (dataType instanceof UserType) {
return CqlIdentifier.of(((UserType) dataType).getTypeName());
}
return of(dataType.asFunctionParameterString());
}
private static boolean isNonFrozenUdt(DataType dataType) {
return dataType.getName() == Name.UDT && !dataType.isFrozen();
}
/**
* @author Jens Schauder
* @since 1.5.1
*/
static class FrozenLiteralDataType extends DataType {
private final CqlIdentifier type;
FrozenLiteralDataType(CqlIdentifier type) {
super(Name.UDT);
this.type = type;
}
/* (non-Javadoc)
* @see com.datastax.driver.core.DataType#isFrozen()
*/
@Override
public boolean isFrozen() {
return true;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return String.format("frozen<%s>", type.toCql());
}
}
}