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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.query;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.cassandra.core.query.CriteriaDefinition.Operator;
import org.springframework.lang.Nullable;
import com.datastax.driver.core.CodecRegistry;
import com.datastax.driver.core.TypeCodec;
/**
* Utility methods for CQL serialization.
*
* @author Mark Paluch
* @see org.springframework.core.convert.converter.Converter
* @see com.datastax.driver.core.CodecRegistry
* @see com.datastax.driver.core.TypeCodec
* @since 2.0
*/
abstract class SerializationUtils {
private SerializationUtils() {}
/**
* Serializes the given object into pseudo-CQL meaning it's trying to create a CQL representation as far as possible
* but falling back to the given object's {@link Object#toString()} method if it's not serializable. Useful for
* printing raw {@link Criteria}s containing complex values before actually converting them into Mongo native types.
*
* @param criteria may be {@literal null}.
* @return may be {@literal null}.
*/
@Nullable
public static String serializeToCqlSafely(@Nullable CriteriaDefinition criteria) {
if (criteria == null) {
return null;
}
CriteriaDefinition.Predicate predicate = criteria.getPredicate();
return String.format("%s %s", criteria.getColumnName(),
predicate.getOperator().toCql(serializeToCqlSafely(predicate.getValue())));
}
/**
* Serializes the given object into pseudo-CQL meaning it's trying to create a CQL representation as far as possible
* but falling back to the given object's {@link Object#toString()} method if it's not serializable. Useful for
* printing raw {@link Criteria}s containing complex values before actually converting them into Mongo native types.
*
* @param value value to serialize to CQL, may be {@literal null}.
* @return the value as a serialized CQL {@link String}, may be {@literal null}.
*/
@Nullable
public static String serializeToCqlSafely(@Nullable Object value) {
if (value == null) {
return null;
}
try {
return serialize(value);
} catch (Exception e) {
if (value instanceof Set) {
return toString((Set) value);
} else if (value instanceof Collection) {
return toString((Collection) value);
} else if (value instanceof Map) {
return toString((Map) value);
} else {
return value.toString();
}
}
}
private static String serialize(@Nullable Object value) {
if (value == null) {
return "null";
}
TypeCodec