org.springframework.data.cassandra.core.cql.converter.ResultSetToListOfStringConverter Maven / Gradle / Ivy
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Cassandra support for Spring Data
/*
* Copyright 2017-2019 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.core.cql.converter;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import org.springframework.core.convert.converter.Converter;
import org.springframework.util.StringUtils;
import com.datastax.driver.core.ResultSet;
/**
* {@link Converter} from {@link ResultSet} to a {@link List} of {@link String}.
*
* @author Mark Paluch
*/
public class ResultSetToListOfStringConverter extends AbstractResultSetConverter> {
public static final ResultSetToListOfStringConverter INSTANCE = new ResultSetToListOfStringConverter();
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.cql.converter.AbstractResultSetConverter#doConvertSingleValue(java.lang.Object)
*/
@Override
protected List doConvertSingleValue(Object object) {
return Collections.singletonList(object.toString());
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.cql.converter.AbstractResultSetConverter#doConvertSingleRow(java.util.Map)
*/
@Override
protected List doConvertSingleRow(Map row) {
return row.values().stream().map(value -> value == null ? null : value.toString()).collect(Collectors.toList());
}
@Override
protected List doConvertResultSet(List