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Cassandra Datastax SFM supports.

There is a newer version: 8.2.3

package org.simpleflatmapper.datastax.impl.getter;

import com.datastax.driver.core.GettableByIndexData;
import org.simpleflatmapper.reflect.Getter;

import java.util.Map;

public class DatastaxMapGetter implements Getter> {

    private final int index;
    private final Class keyType;
    private final Class valueType;

    public DatastaxMapGetter(int index, Class keyType, Class valueType) {
        this.index = index;
        this.keyType = keyType;
        this.valueType = valueType;
    }

    @Override
    public Map get(GettableByIndexData target) throws Exception {
        return target.getMap(index, keyType, valueType);
    }
}