package javathreads.examples.ch15;

import java.util.*;
import java.io.*;

public class LoopPrinter {
    private Vector pStorage[];
    private int growSize;

    public LoopPrinter(int initSize, int growSize) {
        pStorage = new Vector[initSize];
        this.growSize = growSize;
    }

    public LoopPrinter() {
        this(100, 0);
    }

    private synchronized void enlargeStorage(int minSize) {
        int oldSize = pStorage.length;
        if (oldSize < minSize) {
            int newSize = (growSize > 0) ?
                oldSize + growSize : 2 * oldSize;
            if (newSize < minSize) {
                newSize = minSize;
            }    
            Vector newVec[] = new Vector[newSize];
            System.arraycopy(pStorage, 0, newVec, 0, oldSize);
            pStorage = newVec;
        }
    }
 
    public synchronized void print(int index, Object obj) {
        if (index >= pStorage.length) {
            enlargeStorage(index+1);
        }
        if (pStorage[index] == null) {
            pStorage[index] = new Vector();
        }
        pStorage[index].addElement(obj.toString());
    }
 
    public synchronized void println(int index, Object obj) {
        print(index, obj);
        print(index, "\n");
    }
 
    public synchronized void send2stream(PrintStream ps) {
        for (int i = 0; i < pStorage.length; i++) {
            if (pStorage[i] != null) {
                Enumeration e = pStorage[i].elements();
                while (e.hasMoreElements()) {
                    ps.print(e.nextElement());
                }
            }    
        }
    }
}