src/edu/berkeley/fleet/ships/Alu1.java

   1 package edu.berkeley.fleet.ships;
   2 import edu.berkeley.fleet.interpreter.*;
   3 import edu.berkeley.fleet.*;
   4
   5 import java.util.*;
   6 import java.io.*;
   7
   8 public class Alu1 extends InterpreterShip {
   9
  10     DataInbox   in  = new DataInbox(this,  "in");
  11     DataInbox   op  = new DataInbox(this,  "op");
  12     DataOutbox  out = new DataOutbox(this, "out");
  13
  14     public Alu1(Interpreter fleet, String name) { super(fleet, name); }
  15
  16     public String getBalsaName() { return "alu1"; }
  17
  18     public void service() {
  19         if (in.dataReadyForShip() && op.dataReadyForShip()) {
  20             int data   = in.removeDataForShip();
  21             int opcode = in.removeDataForShip();
  22             switch(opcode) {
  23                 case 0: out.addDataFromShip(-1 * data);      // NEG
  24                     break;
  25                 case 1: out.addDataFromShip(data+1);         // INC
  26                     break;
  27                 case 2: out.addDataFromShip(data-1);         // DEC
  28                     break;
  29                 case 3: out.addDataFromShip(Math.abs(data)); // ABS
  30                     break;
  31                 default: out.addDataFromShip(0);
  32                     break;
  33             }
  34         }
  35     }
  36
  37 }