package com.trilogy.fs.raptor.clustering; 
 
import java.util.ArrayList; 
import java.util.List; 
 
/** 
 * @author <A HREF="mailto:razvan.surdulescu@trilogy.com">Razvan Surdulescu</A>, (C) Trilogy 2003 
 */ 
public class Timer { 
    private List m_columns = new ArrayList(); 
    private List m_times = new ArrayList(); 
 
    private boolean m_startFlag; 
    private long m_startTime; 
 
    public void start(String name) { 
        if (m_startFlag) { 
            throw new IllegalStateException("Already start()ed: you need to end() first!"); 
        } 
 
        m_startFlag = true; 
 
        m_columns.add(name); 
        m_startTime = System.currentTimeMillis(); 
    } 
 
    public void end() { 
        if (!m_startFlag) { 
            throw new IllegalStateException("Not yet start()ed: you need to start() first!"); 
        } 
 
        m_startFlag = false; 
 
        m_times.add(new Long(System.currentTimeMillis() - m_startTime)); 
    } 
 
    public String toString() { 
        return toString(true); 
    } 
 
    public String toString(boolean showColumns) { 
        StringBuffer result = new StringBuffer(); 
 
        String nl = System.getProperty("line.separator"); 
 
        if (showColumns) { 
            for (int i = 0; i < m_times.size(); i++) { 
                result.append("\"").append(m_columns.get(i)).append("\"").append(","); 
            } 
            result.append(nl); 
        } 
 
        for (int i = 0; i < m_times.size(); i++) { 
            result.append(m_times.get(i)).append(","); 
        } 
 
        return result.toString(); 
    } 
}