import java.io.PrintWriter;
import Instruction;

/**
 * The amazingly strange "Seq" instruction, which sequences two
 * instructions and can therefore be used to build a tree of instructions.
 * Part of AAAL, the amazingly abstract assembly language.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of April 2001
 */
public class Seq
  implements Instruction
{
  // +--------+------------------------------------------------------------
  // | Fields |
  // +--------+

  /** The first instruction. */
  protected Instruction first;

  /** The second instruction. */
  protected Instruction second;

  // +--------------+------------------------------------------------------
  // | Constructors |
  // +--------------+

  /**
   * Build a new sequence of instructions with specified first
   * and second instruction.
   */
  public Seq(Instruction first, Instruction second) {
    this.first = first;
    this.second = second;
  } // Seq(Instruction, Instruction)

  // +---------------------+-----------------------------------------------
  // | Instruction Methods |
  // +---------------------+

  /**
   * Print the instruction.
   */
  public void print(PrintWriter out) {
    // Note that the Seq should be transparent; it simply
    // seequences instructions.
    first.print(out);
    second.print(out);
  } // print(PrintWriter)

} // class Seq