org.springframework.data.cassandra.core.cql.ColumnMapRowMapper Maven / Gradle / Ivy
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/*
* Copyright 2016-2020 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;
import java.util.Map;
import org.springframework.lang.Nullable;
import org.springframework.util.LinkedCaseInsensitiveMap;
import com.datastax.oss.driver.api.core.cql.ColumnDefinition;
import com.datastax.oss.driver.api.core.cql.ColumnDefinitions;
import com.datastax.oss.driver.api.core.cql.Row;
/**
* {@link RowMapper} implementation that creates a {@code java.util.Map} for each row, representing all columns as
* key-value pairs: one entry for each column, with the column name as key.
*
* The Map implementation to use and the key to use for each column in the column Map can be customized through
* overriding {@link #createColumnMap} and {@link #getColumnKey}, respectively.
*
* Note: By default, ColumnMapRowMapper will try to build a linked Map with case-insensitive keys, to preserve
* column order as well as allow any casing to be used for column names. This requires Commons Collections on the
* classpath (which will be autodetected). Else, the fallback is a standard linked HashMap, which will still preserve
* column order but requires the application to specify the column names in the same casing as exposed by the driver.
*
* @author Mark Paluch
* @since 2.0
* @see ReactiveCqlTemplate#queryForFlux(String)
* @see ReactiveCqlTemplate#queryForMap(String)
*/
public class ColumnMapRowMapper implements RowMapper