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Pulsar SQL - Pulsar Presto Connector
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.pulsar.sql.presto;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;
import static java.util.Objects.requireNonNull;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import io.trino.spi.type.BigintType;
import io.trino.spi.type.IntegerType;
import io.trino.spi.type.TimestampType;
import io.trino.spi.type.Type;
import io.trino.spi.type.VarcharType;
import java.util.Map;
import java.util.Set;
import java.util.function.Consumer;

/**
 * This abstract class represents internal columns.
 */
public class PulsarInternalColumn {


    public static final PulsarInternalColumn PARTITION = new PulsarInternalColumn("__partition__",
            IntegerType.INTEGER, "The partition number which the message belongs to");

    public static final PulsarInternalColumn EVENT_TIME = new PulsarInternalColumn("__event_time__",
            TimestampType.TIMESTAMP, "Application defined timestamp in milliseconds of when the event occurred");

    public static final PulsarInternalColumn PUBLISH_TIME = new PulsarInternalColumn("__publish_time__",
            TimestampType.TIMESTAMP, "The timestamp in milliseconds of when event as published");

    public static final PulsarInternalColumn MESSAGE_ID = new PulsarInternalColumn("__message_id__",
            VarcharType.VARCHAR, "The message ID of the message used to generate this row");

    public static final PulsarInternalColumn SEQUENCE_ID = new PulsarInternalColumn("__sequence_id__",
            BigintType.BIGINT, "The sequence ID of the message used to generate this row");

    public static final PulsarInternalColumn PRODUCER_NAME = new PulsarInternalColumn("__producer_name__",
            VarcharType.VARCHAR, "The name of the producer that publish the message used to generate this row");

    public static final PulsarInternalColumn KEY = new PulsarInternalColumn("__key__",
            VarcharType.VARCHAR, "The partition key for the topic");

    public static final PulsarInternalColumn PROPERTIES = new PulsarInternalColumn("__properties__",
            VarcharType.VARCHAR, "User defined properties");

    private static Set internalFields = ImmutableSet.of(PARTITION, EVENT_TIME, PUBLISH_TIME,
            MESSAGE_ID, SEQUENCE_ID, PRODUCER_NAME, KEY, PROPERTIES);


    private final String name;
    private final Type type;
    private final String comment;

    PulsarInternalColumn(
            String name,
            Type type,
            String comment) {
        checkArgument(!isNullOrEmpty(name), "name is null or is empty");
        this.name = name;
        this.type = requireNonNull(type, "type is null");
        this.comment = requireNonNull(comment, "comment is null");
    }

    public String getName() {
        return name;
    }

    public Type getType() {
        return type;
    }

    PulsarColumnHandle getColumnHandle(String connectorId, boolean hidden) {
        return new PulsarColumnHandle(connectorId,
                getName(),
                getType(),
                hidden,
                true, getName(), null, null, PulsarColumnHandle.HandleKeyValueType.NONE);
    }

    PulsarColumnMetadata getColumnMetadata(boolean hidden) {
        return new PulsarColumnMetadata(name, type, comment, null, hidden, true,
                PulsarColumnHandle.HandleKeyValueType.NONE, new PulsarColumnMetadata.DecoderExtraInfo());
    }

    public static Set getInternalFields() {
        return internalFields;
    }

    public static Map getInternalFieldsMap() {
        ImmutableMap.Builder builder = ImmutableMap.builder();
        getInternalFields().forEach(new Consumer() {
            @Override
            public void accept(PulsarInternalColumn pulsarInternalColumn) {
                builder.put(pulsarInternalColumn.getName(), pulsarInternalColumn);
            }
        });
        return builder.build();
    }

}