TableStreamBuildFactory.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.doris.catalog.stream;


import org.apache.doris.catalog.Column;
import org.apache.doris.catalog.TableIf;
import org.apache.doris.catalog.Type;
import org.apache.doris.common.DdlException;

import com.google.common.base.Preconditions;

import java.util.List;

public class TableStreamBuildFactory {
    public static class BuildParams {
        String tableStreamName;
        TableIf baseTable;
    }

    private BuildParams params;

    public TableStreamBuildFactory() {
        params = new BuildParams();
    }

    public TableStreamBuildFactory withBaseTable(TableIf baseTable) {
        params.baseTable = baseTable;
        return this;
    }

    public TableStreamBuildFactory withName(String name) {
        params.tableStreamName = name;
        return this;
    }

    public BaseTableStream build() throws DdlException {
        Preconditions.checkNotNull(params, "The factory isn't initialized.");
        Preconditions.checkNotNull(params.tableStreamName, "Stream name isn't initialized.");
        Preconditions.checkNotNull(params.baseTable, "Stream base table isn't initialized.");
        List<Column> schema = new java.util.ArrayList<>(params.baseTable.getBaseSchema());

        // extra columns
        Column changeTypeColumn = new Column(Column.STREAM_CHANGE_TYPE_COL, Type.VARCHAR);
        Column sequenceColumn = new Column(Column.STREAM_SEQ_COL, Type.BIGINT);
        changeTypeColumn.setIsVisible(false);
        sequenceColumn.setIsVisible(false);
        schema.add(changeTypeColumn);
        schema.add(sequenceColumn);
        switch (params.baseTable.getType()) {
            case OLAP:
                return new OlapTableStream(params.tableStreamName, schema, params.baseTable);
            default:
                throw new DdlException("unsupported stream base table type: " + params.baseTable.getType());
        }
    }
}