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JMockit Coverage is a code coverage tool with several metrics (line, path, data) capable of generating HTML reports. It is designed with ease of use in mind, avoiding the need for complex configuration. Instead, smart (but overridable) defaults are employed, such as the selection of which classes to consider for coverage, and where to find sources files for report generation.

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/*
 * Copyright (c) 2006-2015 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage;

import java.io.*;
import javax.annotation.*;

import mockit.coverage.data.*;

final class AccretionFile
{
   @Nonnull private final File outputFile;
   @Nonnull private final CoverageData newData;

   AccretionFile(@Nonnull String outputDir, @Nonnull CoverageData newData)
   {
      String parentDir = outputDir.isEmpty() ? null : outputDir;
      outputFile = new File(parentDir, "coverage.ser");

      newData.fillLastModifiedTimesForAllClassFiles();
      this.newData = newData;
   }

   void mergeDataFromExistingFileIfAny() throws IOException
   {
      if (outputFile.exists()) {
         CoverageData previousData = CoverageData.readDataFromFile(outputFile);
         newData.merge(previousData);
      }
   }

   void generate() throws IOException
   {
      newData.writeDataToFile(outputFile);
      System.out.println("JMockit: Coverage data written to " + outputFile.getCanonicalPath());
   }
}