backends-common/cassandra/src/main/java/org/apache/james/backends/cassandra/init/CassandraTypesProvider.java

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package org.apache.james.backends.cassandra.init;

import java.util.Map;
import java.util.Optional;

import javax.inject.Inject;

import com.datastax.oss.driver.api.core.CqlIdentifier;
import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.type.UserDefinedType;
import com.google.common.collect.ImmutableMap;

public class CassandraTypesProvider {
    private final CqlSession session;

    @Inject
    public CassandraTypesProvider(CqlSession session) {
        this.session = session;
    }

    public Map<CqlIdentifier, UserDefinedType> userDefinedTypes() {
        return session.getKeyspace().map(keyspace ->
            session.getMetadata()
                .getKeyspaces()
                .get(keyspace)
                .getUserDefinedTypes())
            .orElse(ImmutableMap.of());
    }

    public UserDefinedType getDefinedUserType(String typeName) {
        return Optional.ofNullable(userDefinedTypes().get(CqlIdentifier.fromCql(typeName)))
            .orElseThrow(() -> new RuntimeException("Cassandra UDT " + typeName + " can not be retrieved"))
            .copy(true);
    }

}