loganalyzer.java

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/**
 * Read web server data and analyse
 * hourly access patterns.
 * 
 * @author David J. Barnes and Michael Kolling.
 * @version 2006.03.30
 */
public class LogAnalyzer
{
    // Where to calculate the hourly access counts.
    private int[] hourCounts;
    // Use a LogfileReader to access the data.
    private LogfileReader reader;

    /**
     * Create an object to analyze hourly web accesses.
     */
    public LogAnalyzer()
    { 
        // Create the array object to hold the hourly
        // access counts.
        hourCounts = new int[24];
        // Create the reader to obtain the data.
        reader = new LogfileReader();
    }

    /**
     * Analyze the hourly access data from the log file.
     */
    public void analyzeHourlyData()
    {
        while(reader.hasMoreEntries()) {
            LogEntry entry = reader.nextEntry();
            int hour = entry.getHour();
            hourCounts[hour]++;
        }
    }

    /**
     * Print the hourly counts.
     * These should have been set with a prior
     * call to analyzeHourlyData.
     */
    public void printHourlyCounts()
    {
        System.out.println("Hr: Count");
        for(int hour = 0; hour < hourCounts.length; hour++) {
            System.out.println(hour + ": " + hourCounts[hour]);
        }
    }
    
    /**
     * Print the lines of data read by the LogfileReader
     */
    public void printData()
    {
        reader.printData();
    }
}