InputDecl Class

Class InputDecl  extends IODecl and define an input event.

 
public class InputDecl extends IODecl
{
  public InputDecl(String internalName,String externalName,
                                       Instruction body) 
  { 
    this.internalName = internalName; 
    this.externalName = externalName; 
    this.body = body;
  }

  final public String toString(){ 
    return "input "+internalName+
           " is "+externalName+" in "+body+" end";
  }

  final protected byte activation(Machine machine) 
  { 
    boolean present = machine.isGenerated(externalName);
    setInternal(machine);           // Set internal event
    if (present) machine.generate(internalName); // Transmit
    byte res = body.activ(machine); // Execute body
    saveInternal(machine);          // Save internal event
    return res;
  }
}

OutputDecl  and InOutDecl  classes are very similar, and for simplicity we do not give their definitions here.