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Trino - Service Provider Interface (SPI)

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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.spi.predicate;

import io.trino.spi.TrinoException;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.security.ConnectorIdentity;
import io.trino.spi.type.TimeZoneKey;

import java.time.Instant;
import java.util.Locale;
import java.util.Optional;

import static io.trino.spi.StandardErrorCode.INVALID_SESSION_PROPERTY;
import static io.trino.spi.type.TimeZoneKey.UTC_KEY;
import static java.util.Locale.ENGLISH;

/**
 * A dummy {@link ConnectorSession} to be used for toString implementations and other diagnostic purposes.
 */
enum ToStringSession
        implements ConnectorSession
{
    INSTANCE;

    @Override
    public String getQueryId()
    {
        return "to_string";
    }

    @Override
    public Optional getSource()
    {
        return Optional.of("to_string");
    }

    @Override
    public ConnectorIdentity getIdentity()
    {
        return ConnectorIdentity.ofUser("to_string");
    }

    @Override
    public TimeZoneKey getTimeZoneKey()
    {
        return UTC_KEY;
    }

    @Override
    public Locale getLocale()
    {
        return ENGLISH;
    }

    @Override
    public Instant getStart()
    {
        return Instant.ofEpochMilli(0);
    }

    @Override
    public Optional getTraceToken()
    {
        return Optional.empty();
    }

    @Override
    public  T getProperty(String name, Class type)
    {
        throw new TrinoException(INVALID_SESSION_PROPERTY, "Unknown session property " + name);
    }
}