sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/meta/provider/seqgen/GenerateSequenceTableProvider.java

/*
 * 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.beam.sdk.extensions.sql.meta.provider.seqgen;

import com.google.auto.service.AutoService;
import org.apache.beam.sdk.extensions.sql.meta.BeamSqlTable;
import org.apache.beam.sdk.extensions.sql.meta.Table;
import org.apache.beam.sdk.extensions.sql.meta.provider.InMemoryMetaTableProvider;
import org.apache.beam.sdk.extensions.sql.meta.provider.TableProvider;

/**
 * Sequence generator table provider.
 *
 * <p>A sample of text table is:
 *
 * <pre>{@code
 * CREATE EXTERNAL TABLE MY_SEQUENCE(
 *   sequence BIGINT COMMENT 'this is the primary key',
 *   event_time TIMESTAMP COMMENT 'this is the element timestamp'
 * )
 * TYPE 'sequence';
 * }</pre>
 */
@AutoService(TableProvider.class)
public class GenerateSequenceTableProvider extends InMemoryMetaTableProvider {

  @Override
  public String getTableType() {
    return "sequence";
  }

  @Override
  public BeamSqlTable buildBeamSqlTable(Table table) {
    return new GenerateSequenceTable(table);
  }
}