import java.io.File;
import java.io.PrintStream;
import java.io.PrintWriter;

/*
 * Sample_Visitor.java
 * 
 * Created on Aug 25, 2007
 * 
 * by Donald Yessick
 */

/**
 * Sample_Visitor
 * @author Donald Yessick
 * printStream the ouput stream to write to 
 * id a static counter of sampleVisitors
 */
public class Sample_Visitor
        implements CS220_Visitor_Interface {

    private static int cnt = 0;
    private int id = 0;
    private PrintStream printStream;
    /**
     * Default constructor -- sets print writer to System.out
     *
     */
    Sample_Visitor(){
        this.printStream = System.out;
        this.id = Sample_Visitor.cnt++;
    }
    /**
     * constructor -- sets print writer to a printStream (like System.out)t
     * @param printStream the PrintStream to print to
     */
    Sample_Visitor(PrintStream printStream){
        this.printStream = printStream;        
        this.id = Sample_Visitor.cnt++;
    }
    
    /**
     * visit does something with an object, in this case it prints the object using the objects toString method.
     * @param object The object being visited
     * @see CS220_Visitor_Interface#visit(java.lang.Object)
     */
    public void visit(Object object) {
        System.out.println(this.toString() + " is Visiting " + object.toString());
        printStream.println(object.toString());
    }

    public String toString(){
        return "sample_Visitor #" +id;
    }
    /*
     * A test function for this visitor
     */
    public static void main(String[] args)
    {
        System.out.println("Start Sample_Visitor Test:\n\targ.length=="+args.length 
                + "\n\tfilename==\"TestOut_Sample_Visitor"+args.length+".txt\"");
        try {
            //creating two visitors
            //this one prints to standard out
            Sample_Visitor sample_Visitor = new Sample_Visitor(System.out);
            //this one prints to a file
            PrintStream printStream = new PrintStream("TestOut_Sample_Visitor"+args.length+".txt");
            Sample_Visitor file_Visitor = new Sample_Visitor(printStream);
           
            //visit the arg strings
            for (int i=0; i < args.length; i++){
                file_Visitor.visit(args[i]);
            }
            //the args might be empty so let's visit our sample_Visitor
            //(id # should be 0 or 3)
            file_Visitor.visit(sample_Visitor);
            //(id # should be 1 or 4)
            file_Visitor.visit(file_Visitor);
            //create a new Sample_Vistor and Visit it too
            sample_Visitor = new Sample_Visitor(System.out);
            //(id # should be 2 or 5)
            file_Visitor.visit(sample_Visitor);
            
            if (args.length == 0){
                String[] params = {"one", "two", "three"};
                Sample_Visitor.main( params );
            }
            printStream.close();
        }
        catch (Exception exception){
            System.out.println("Error -- Exception thrown in Sample_Visitor");
            exception.printStackTrace(System.err);
            System.exit(1);
        }
        System.out.println("End Sample_Visitor Test");
    }
}