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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) 2006-2014 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.coverage;

import java.io.*;
import java.util.*;

import org.jetbrains.annotations.*;

import mockit.coverage.data.*;

final class DataFileMerging
{
   @NotNull private final List inputFiles;

   DataFileMerging(@NotNull String[] inputPaths)
   {
      inputFiles = new ArrayList(inputPaths.length);

      for (String path : inputPaths) {
         addInputFileToList(path.trim());
      }
   }

   private void addInputFileToList(@NotNull String path)
   {
      if (!path.isEmpty()) {
         File inputFile = new File(path);

         if (inputFile.isDirectory()) {
            inputFile = new File(inputFile, "coverage.ser");
         }

         inputFiles.add(inputFile);
      }
   }

   @NotNull CoverageData merge() throws IOException
   {
      CoverageData mergedData = null;

      for (File inputFile : inputFiles) {
         if (inputFile.exists()) {
            CoverageData existingData = CoverageData.readDataFromFile(inputFile);

            if (mergedData == null) {
               mergedData = existingData;
            }
            else {
               mergedData.merge(existingData);
            }
         }
      }

      if (mergedData == null) {
         throw new IllegalArgumentException("No input \"coverage.ser\" files found");
      }

      return mergedData;
   }
}