/**
 * @file            OutSerialize.java
 * @author          Robert S Laramee
 * @version         1.0
 * @see             DrawCanvas.java
 * <P>
 * start date       Friday,   27 Nov 98
 * finish date      Thursday, 03 Dec 98
 * <P>
 * description      This class contains the methods and data necessary for
 *                  saving user defined solid objects to a file (serializing)
 */

import java.util.*;  // for Vector class
//import matrix.*;     // for Matrix4, Point4 class
import java.io.*;     // for FileReader, StreamTokenizer, PrintWriter

public class OutSerialize { 

    private PrintWriter      output;
    private FileOutputStream fos;
    private String           fileName;

    /**
     * constructor
     * We'll create one instance of the OutSerialize object along with the
     * one instance of the DrawCanavas object.  This seems to make sense
     * so we do not have more than one instance with I/O to the same file.
     * Although, we could just make the methods synchronized.
     */
    public OutSerialize() {

	output   = null;
	fos      = null; 
	fileName = new String("solid.dat");
   }

    /**
     * All we have to do is go down the solid object list and have each
     * solid object definition and each instance print itself
     * @param SOlist -a reference to the list of solid objects
     */
    public void print (SolidObjectList SOlist) {

	for (int i = 0; i < SOlist.size(); i++) {

	    /* print the definition */
	    SolidObject so = (SolidObject)SOlist.getSolidObject(i);
	    so.print();
	    System.out.println("e");
	    
	    for(int j = 0; j < so.getInstances().size(); j++) {

		/* print the instances */
		Instance instance = (Instance)so.getInstances().elementAt(j);
		instance.print();
	    }
	}
    }
    /**
     * This method saves the solid object list to a file.  Really what it
     * does is just obtain a handle to an output stream.  The printToFile()
     * method is what actually saves the info in the file.
     * @param SOlist -a reference to the solid object list
     * @param CTinstances -a reference to the solid object list
     */
    public void save (SolidObjectList SOlist, Vector CTinstances) {

	if(SOlist.size() == 0) {
	    System.out.println("\n** Error: No objects to save.");
	    return;
	}

	if (fileName != null) {

	    try {
		fos    = new FileOutputStream (fileName);
		output = new PrintWriter(fos, false);  // don't need to flush 
	    
	    } catch ( IOException e ) {

		System.err.println ("** Error: File printing to file: " + 
				    fileName);
		System.err.println ("** Error: " + e);
		System.err.println ("Using standard output");
		output = new PrintWriter(
		         new OutputStreamWriter(System.out), true);
	    }

	} else {
	    output = new PrintWriter(new OutputStreamWriter(System.out), true);
	}

	printToFile(output, SOlist, CTinstances);
	output.close(); // It won't work without this!
	System.out.println("\nSolid object list printed to file: " + fileName);
    }
    /**
     * printToFile() prints the all the solid objects to a file, definitions
     * and instances
     * @param output      -a reference to an output file
     * @param SOlist      -a reference to the solid object list
     * @param CTinstances -a reference to the solid object list
     */
    private void printToFile(PrintWriter output, SolidObjectList SOlist,
			                         Vector CTinstances) {

	/*  FOR EACH solid object in the solid object list  */
	for (int i = 0; i < SOlist.size(); i++) {

	    /* print the definition */
	    SolidObject so = (SolidObject)SOlist.getSolidObject(i);
	    so.printToFile(output);
	    output.println("e");
	    
	    for(int j = 0; j < so.getInstances().size(); j++) {

		/* print the instances */
		Instance instance = (Instance)so.getInstances().elementAt(j);
		instance.printToFile(output);
	    }
	}
	/*  FOR EACH cube and tetrahedron in their instance list */
	for (int i = 0; i < CTinstances.size(); i++) {

	    /* print the instances */
	    Instance instance = (Instance)CTinstances.elementAt(i);
	    instance.printToFile(output);
	}
    }
}