import java.util.ArrayList;
import java.util.Iterator;

public class PerformanceLog {

	private ArrayList log = new ArrayList();
	private long testTime;
	
	public static class ZLogEntry {
		public String name;
		public long time;
		
		public ZLogEntry(String aName, long aTime) {
			name = aName;
			time = aTime;
		}
	}
	
	public void startTest() {
		Runtime.getRuntime().gc();
		testTime = System.currentTimeMillis();
	}

	public void endTest(String name) {
		testTime = System.currentTimeMillis() - testTime;
		addEntry(name, testTime);
		System.gc();
	}

	public void addEntry(String aName, long aTime) {
		log.add(new ZLogEntry(aName, aTime));
	}
	
	public void clear() {
		log.clear();
	}

	public void writeLog() {

		System.out.println();
		System.out.println("Test data for input into spreadsheet:");
		System.out.println();

		Iterator i = log.iterator();
		while (i.hasNext()) {
			ZLogEntry each = (ZLogEntry) i.next();
			System.out.println(each.time);
		}

		System.out.println();
		System.out.println("Labled test results, see above for simple column \n of times for input into spreadsheet:");
		System.out.println();

		i = log.iterator();
		while (i.hasNext()) {
			ZLogEntry each = (ZLogEntry) i.next();
			System.out.println(each.name + ", " + each.time);
		}
	}
}