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package ilog.language.design.kernel;

/**
 * @version     Last modified on Sun Dec 08 13:53:40 2002 by hak
 * @author      <a href="mailto:hak@ilog.fr">Hassan A&iuml;t-Kaci</a>
 * @copyrite   &copy; 2000-2002 <a href="http://www.ilog.fr/">ILOG, S.A.</a>
 */

import ilog.language.design.types.*;
import ilog.language.design.base.*;

public abstract class AndOr extends Expression
{
  Type _type = Type.BOOLEAN();

  protected Expression _leftExpression;
  protected Expression _riteExpression;

  public AndOr (Expression leftExpression, Expression riteExpression)
    {
      _leftExpression = leftExpression;
      _riteExpression = riteExpression;      
    }

  public final Expression left ()
    {
      return _leftExpression;
    }

  public final Expression right ()
    {
      return _riteExpression;
    }

  public final int numberOfSubexpressions ()
    {
      return 2;
    }

  public final Expression subexpression (int n) throws NoSuchSubexpressionException
    {
      switch (n)
        {
        case 0:
          return _leftExpression;
        case 1:
          return _riteExpression;
        }

      throw new NoSuchSubexpressionException(this,n);
    }

  public final Expression setSubexpression (int n, Expression expression) throws NoSuchSubexpressionException
    {
      switch (n)
        {
        case 0:
          _leftExpression = expression;
          break;
        case 1:
          _riteExpression = expression;
          break;
        default:
          throw new NoSuchSubexpressionException(this,n);  
        }

      return this;
    }

  public abstract void compile (Compiler compiler);

  public final void setType (Type type)
    {
      throw new java.lang.Error("Illegal method call in "+getClass()+": setType(Type)");
    }

  public final Type type ()
    {
      return _type.value();
    }

  public final Type typeRef ()
    {
      return _type;
    }

  public final Type checkedType ()
    {
      return _type;
    }

  public final void setCheckedType (Type type)
    {
    }

  public final void setCheckedType ()
    {
      if (setCheckedTypeLocked()) return;
      _leftExpression.setCheckedType();
      _riteExpression.setCheckedType();
    }

  public final void typeCheck (TypeChecker typeChecker) throws TypingErrorException
    {
      if (typeCheckLocked()) return;

      _leftExpression.typeCheck(Type.BOOLEAN(),typeChecker);
      _riteExpression.typeCheck(Type.BOOLEAN(),typeChecker);
    }
}