/*
 * 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.wayang.api.sql.calcite.schema;

import org.apache.calcite.schema.Table;

import java.util.HashMap;
import java.util.Map;

public class WayangSchemaBuilder {

    private final String schemaName;
    private final Map<String, Table> tableMap = new HashMap<>();

    private WayangSchemaBuilder(String schemaName) {
        if (schemaName == null || schemaName.isEmpty()) {
            throw new IllegalArgumentException("Schema name cannot be null or empty");
        }

        this.schemaName = schemaName;
    }

    public static WayangSchemaBuilder build(String schemaName) {
        return new WayangSchemaBuilder(schemaName);
    }

    public WayangSchemaBuilder addTable(WayangTable table) {
        if (tableMap.containsKey(table.getTableName())) {
            throw new IllegalArgumentException("Table already defined: " + table.getTableName());
        }

        tableMap.put(table.getTableName(), table);

        return this;
    }

    public WayangSchema build() {
        return new WayangSchema(schemaName, tableMap);
    }
}
