flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/SourceSchema.java

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// 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
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// specific language governing permissions and limitations
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package org.apache.doris.flink.tools.cdc;

import org.apache.flink.util.StringUtils;

import org.apache.doris.flink.catalog.doris.DataModel;
import org.apache.doris.flink.catalog.doris.FieldSchema;
import org.apache.doris.flink.catalog.doris.TableSchema;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.StringJoiner;

public abstract class SourceSchema {
    protected final String databaseName;
    protected final String schemaName;
    protected final String tableName;
    protected final String tableComment;
    protected LinkedHashMap<String, FieldSchema> fields;
    public List<String> primaryKeys;
    public DataModel model = DataModel.UNIQUE;

    public SourceSchema(
            String databaseName, String schemaName, String tableName, String tableComment)
            throws Exception {
        this.databaseName = databaseName;
        this.schemaName = schemaName;
        this.tableName = tableName;
        this.tableComment = tableComment;
    }

    public abstract String convertToDorisType(String fieldType, Integer precision, Integer scale);

    public abstract String getCdcTableName();

    public String getTableIdentifier() {
        return getString(databaseName, schemaName, tableName);
    }

    public static String getString(String databaseName, String schemaName, String tableName) {
        StringJoiner identifier = new StringJoiner(".");
        if (!StringUtils.isNullOrWhitespaceOnly(databaseName)) {
            identifier.add(databaseName);
        }
        if (!StringUtils.isNullOrWhitespaceOnly(schemaName)) {
            identifier.add(schemaName);
        }

        if (!StringUtils.isNullOrWhitespaceOnly(tableName)) {
            identifier.add(tableName);
        }

        return identifier.toString();
    }

    public TableSchema convertTableSchema(Map<String, String> tableProps) {
        TableSchema tableSchema = new TableSchema();
        tableSchema.setModel(this.model);
        tableSchema.setFields(this.fields);
        tableSchema.setKeys(buildKeys());
        tableSchema.setTableComment(this.tableComment);
        tableSchema.setDistributeKeys(buildDistributeKeys());
        tableSchema.setProperties(tableProps);
        return tableSchema;
    }

    private List<String> buildKeys() {
        return buildDistributeKeys();
    }

    private List<String> buildDistributeKeys() {
        if (!this.primaryKeys.isEmpty()) {
            return primaryKeys;
        }
        if (!this.fields.isEmpty()) {
            Map.Entry<String, FieldSchema> firstField = this.fields.entrySet().iterator().next();
            return Collections.singletonList(firstField.getKey());
        }
        return new ArrayList<>();
    }

    public String getDatabaseName() {
        return databaseName;
    }

    public String getTableName() {
        return tableName;
    }

    public Map<String, FieldSchema> getFields() {
        return fields;
    }

    public List<String> getPrimaryKeys() {
        return primaryKeys;
    }

    public String getTableComment() {
        return tableComment;
    }

    public DataModel getModel() {
        return model;
    }

    public void setModel(DataModel model) {
        this.model = model;
    }
}