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Trino - Kudu Connector
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/*
 * 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 io.trino.plugin.kudu.schema;

import com.google.common.collect.ImmutableList;
import io.trino.plugin.kudu.KuduClientWrapper;
import io.trino.spi.TrinoException;
import io.trino.spi.connector.SchemaNotFoundException;
import io.trino.spi.connector.SchemaTableName;

import java.util.List;

import static io.trino.plugin.kudu.KuduClientSession.DEFAULT_SCHEMA;
import static io.trino.spi.StandardErrorCode.GENERIC_USER_ERROR;

public class NoSchemaEmulation
        implements SchemaEmulation
{
    @Override
    public void createSchema(KuduClientWrapper client, String schemaName)
    {
        if (DEFAULT_SCHEMA.equals(schemaName)) {
            throw new SchemaAlreadyExistsException(schemaName);
        }
        throw new TrinoException(GENERIC_USER_ERROR, "Creating schema in Kudu connector not allowed if schema emulation is disabled.");
    }

    @Override
    public void dropSchema(KuduClientWrapper client, String schemaName, boolean cascade)
    {
        if (DEFAULT_SCHEMA.equals(schemaName)) {
            throw new TrinoException(GENERIC_USER_ERROR, "Deleting default schema not allowed.");
        }
        throw new SchemaNotFoundException(schemaName);
    }

    @Override
    public boolean existsSchema(KuduClientWrapper client, String schemaName)
    {
        return DEFAULT_SCHEMA.equals(schemaName);
    }

    @Override
    public List listSchemaNames(KuduClientWrapper client)
    {
        return ImmutableList.of("default");
    }

    @Override
    public String toRawName(SchemaTableName schemaTableName)
    {
        if (DEFAULT_SCHEMA.equals(schemaTableName.getSchemaName())) {
            return schemaTableName.getTableName();
        }
        throw new SchemaNotFoundException(schemaTableName.getSchemaName());
    }

    @Override
    public SchemaTableName fromRawName(String rawName)
    {
        return new SchemaTableName(DEFAULT_SCHEMA, rawName);
    }

    @Override
    public String getPrefixForTablesOfSchema(String schemaName)
    {
        return "";
    }

    @Override
    public List filterTablesForDefaultSchema(List rawTables)
    {
        return rawTables;
    }
}