import java.awt.*;            // Java GUI classes
import java.applet.*;

public abstract class DomainLogic {  // super class, abstract => must be subclassed 
  
  // protected variables so subclasses can access
  protected TextArea textArea1;              // print to textArea1
  protected static Account account = null;   // current account, static to share among subclasses
  protected static Investor investor = null; // current investor, static also 

  public DomainLogic(TextArea textArea1) {
    this.textArea1 = textArea1;
  }
  // protected methods so subclasses can access 
  protected boolean chkLogin() {  // reports and trading can only occur after a login
    boolean OK = false;
    if (investor==null)
      textArea1.append("Must login first.\n");
    else
      if (account==null)
        textArea1.append("Must have an account.\n");
      else
        OK = true;
    return OK;
  }
  // helper methods for text processing
  protected double toDouble(String s) {
  Double d = new Double(0.0);
    try {
      d = Double.valueOf(s);
    } catch(Exception e) {return 0.0;}
    return d.doubleValue();
  }
  protected int toInt(String s) {
  Integer i = new Integer(0);
    try {
      i = Integer.valueOf(s);
    } catch(Exception e) {return 0;}
    return i.intValue();
  }
  protected String pad(String s, int width, String padChar, boolean padLeft) {
    for (int i=s.length()+1; i<=width; i++)
      if (padLeft)
        s = padChar + s;
      else
        s = s + padChar;
    return s;
  }
}