pdfbox-trunk/preflight/src/test/java/org/apache/pdfbox/preflight/Benchmark.java
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 * to you under the Apache License, Version 2.0 (the
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package org.apache.pdfbox.preflight;

import java.io.File;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.pdfbox.io.IOUtils;
import org.apache.pdfbox.preflight.ValidationResult.ValidationError;
import org.apache.pdfbox.preflight.parser.PreflightParser;

public class Benchmark
{

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception
    {
        if (args.length < 3)
        {
            System.err.println("Usage : Benchmark loop resultFile <file1 ... filen|dir>");
            System.exit(255);
        }

        Integer loop = Integer.parseInt(args[0]);
        FileWriter resFile = new FileWriter(new File(args[1]));

        List<File> lfd = new ArrayList<>();
        for (int i = 2; i < args.length; ++i)
        {
            File fi = new File(args[i]);
            if (fi.isDirectory())
            {
                Collection<File> cf = FileUtils.listFiles(fi, null, true); // Get All files contained by the dir
                lfd.addAll(cf);
            }
            else
            {
                lfd.add(fi);
            }
        }

        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss.Z");

        long startGTime = System.currentTimeMillis();

        int size = lfd.size();
        for (int i = 0; i < loop; i++)
        {
            File file = lfd.get(i % size);
            long startLTime = System.currentTimeMillis();
            ValidationResult result = PreflightParser.validate(file);
            if (!result.isValid())
            {
                resFile.write(file.getAbsolutePath() + " isn't PDF/A\n");
                for (ValidationError error : result.getErrorsList())
                {
                    resFile.write(error.getErrorCode() + " : " + error.getDetails() + "\n");
                }
            }
            long endLTime = System.currentTimeMillis();
            resFile.write(file.getName() + " (ms) : " + (endLTime - startLTime) + "\n");
            resFile.flush();
        }

        long endGTime = System.currentTimeMillis();

        resFile.write("Start : " + sdf.format(new Date(startGTime)) + "\n");
        resFile.write("End : " + sdf.format(new Date(endGTime)) + "\n");
        resFile.write("Duration (ms) : " + (endGTime - startGTime) + "\n");
        resFile.write("Average (ms) : " + (int) ((endGTime - startGTime) / loop) + "\n");

        System.out.println("Start : " + sdf.format(new Date(startGTime)));
        System.out.println("End : " + sdf.format(new Date(endGTime)));
        System.out.println("Duration (ms) : " + (endGTime - startGTime));
        System.out.println("Average (ms) : " + (int) ((endGTime - startGTime) / loop));
        resFile.flush();
        IOUtils.closeQuietly(resFile);
    }
}
