/**
 * Column class
 */
export class Column {
  /**
   * count of column data entries
   */
  public length: number;
  /**
   * column key name
   */
  private key: string;
  /**
   * column data container
   */
  private data: string[];

  public constructor(key: string, data: string[]) {
    this.key = key;
    this.data = data;
    this.length = data.length;
  }

  /**
   * Get column name
   * @returns column name
   */
  public getKey(): string {
    return this.key;
  }

  /**
   * Get column data
   * @returns column data
   */
  public getData(): string[] {
    return this.data;
  }

  /**
   * Get column data at given index
   * @param idx data index
   * @returns data at given index
   */
  public getDataByIndex(idx: number): string | null {
    return this.hasDataIndex(idx) ? this.data[idx] : null;
  }

  /**
   * Check if column has a given data index
   * @param idx data index
   * @returns boolean result
   */
  private hasDataIndex(idx: number): boolean {
    return idx >= 0 && idx < this.length;
  }
}