public class EvaluateVisitor implements EG2Visitor {
	
	public Object visit(SimpleNode node, Object data)
	{
		System.out.println(" :SimpleNode: ");
		Integer value = new Integer(0);
		return value;
	}
	
	public Object visit(ASTStart node, Object data)
	{
		System.out.println(" :ASTStart: ");
		return node.jjtGetChild(0).jjtAccept(this, data);
	}
	
	public Object visit(ASTExpression node, Object data)
	{
		System.out.println(" :ASTExpression: ");
		return node.jjtGetChild(0).jjtAccept(this, data);
	}
	
	public Object visit(ASTAdditiveExpression node, Object data)
	{
		System.out.println(" :ASTAdditiveExpression: ");
		Integer sum = 0;
		int num = node.jjtGetNumChildren();
		for(int n=0; n < num; ++n)
		{
			Object v = node.jjtGetChild(n).jjtAccept(this, data);
			sum += (Integer)v;
		}
		
		return sum;
	}
	
	public Object visit(ASTMultiplicativeExpression node, Object data)
	{
		System.out.println(" :ASTMultiplactiveExpression: ");
		Integer mult = new Integer(1);
		
		int num = node.jjtGetNumChildren();
		for(int n=0; n < num; ++n)
		{
			Object v = node.jjtGetChild(n).jjtAccept(this, data);
			mult *= (Integer)v;
		}
		
		return mult;
	}
	
	public Object visit(ASTUnaryExpression node, Object data)
	{
		System.out.println(" :ASTUnaryExpression: ");
		Object v = node.jjtGetChild(0).jjtAccept(this, data);
		
		Integer value = (Integer)v;
		return value;
	}
	
	public Object visit(ASTIdentifier node, Object data)
	{
		System.out.println(" :ASTIdentifier:" + node.jjtGetValue() + " ");
		
		Integer value = new Integer(0);
		return value;
	}
	
	public Object visit(ASTInteger node, Object data)
	{
		System.out.println(" :ASTInteger:" + node.jjtGetValue() + " ");
		Integer value = Integer.parseInt((String)node.jjtGetValue());
		return value;
	}
}