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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * Licensed 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 br.com.objectos.schema;

import java.util.LinkedHashMap;
import java.util.Map;

import br.com.objectos.core.util.ImmutableList;

/**
 * @author [email protected] (Marcio Endo)
 */
class TableDefDsl {

  private final String name;
  private final Map columnDefMap = new LinkedHashMap<>();

  public TableDefDsl(String name) {
    this.name = name;
  }

  public TableDef build() {
    return TableDef.builder()
        .name(name)
        .columnDefList(ImmutableList.copyOf(columnDefMap.values()))
        .build();
  }

  public void addColumn(ColumnDef column) throws DdlException {
    String columnName = column.name();
    if (columnDefMap.containsKey(columnName)) {
      throw DdlException.of("Tried to add an existing column: '%s'.", columnName);
    }
    columnDefMap.put(columnName, column);
  }

  public void dropColumn(String columnName) throws DdlException {
    ColumnDef removed = columnDefMap.remove(columnName);
    if (removed == null) {
      throw DdlException.of("Tried to drop a non-existing column: '%s'.", columnName);
    }
  }

}