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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.reporting.packages;

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

import mockit.coverage.*;
import mockit.coverage.data.*;

final class PackageCoverageReport extends ListWithFilesAndPercentages
{
   @Nonnull private final Map filesToFileData;
   @Nullable private final Collection sourceFilesNotFound;
   @Nonnull private final char[] fileNameWithSpaces;

   PackageCoverageReport(
      @Nonnull PrintWriter output, @Nullable Collection sourceFilesNotFound,
      @Nonnull Map filesToFileData, @Nonnull Collection> allSourceFileNames)
   {
      super(output, "          ");
      this.sourceFilesNotFound = sourceFilesNotFound;
      this.filesToFileData = filesToFileData;
      fileNameWithSpaces = new char[maximumSourceFileNameLength(allSourceFileNames)];
   }

   private static int maximumSourceFileNameLength(@Nonnull Collection> allSourceFileNames)
   {
      int maxLength = 0;

      for (List files : allSourceFileNames) {
         for (String fileName : files) {
            int n = fileName.length();

            if (n > maxLength) {
               maxLength = n;
            }
         }
      }

      return maxLength;
   }

   @Override
   protected void writeMetricsForFile(@Nullable String packageName, @Nonnull String fileName)
   {
      String filePath = packageName == null || packageName.isEmpty() ? fileName : packageName + '/' + fileName;
      final FileCoverageData fileData = filesToFileData.get(filePath);

      writeRowStart();
      printIndent();
      output.write("  ");

      int fileNameLength = buildFileNameWithTrailingSpaces(fileName);
      writeTableCellWithFileName(filePath, fileNameLength);

      Metrics.performAction(new Metrics.Action() {
         @Override
         public void perform(@Nonnull Metrics metric)
         {
            writeCodeCoverageMetricForFile(metric, fileData.getPerFileCoverage(metric));
         }
      });

      writeRowClose();
   }

   private int buildFileNameWithTrailingSpaces(@Nonnull String fileName)
   {
      int n = fileName.length();

      fileName.getChars(0, n, fileNameWithSpaces, 0);
      Arrays.fill(fileNameWithSpaces, n, fileNameWithSpaces.length, ' ');
      
      return n;
   }

   private void writeTableCellWithFileName(@Nonnull String filePath, int fileNameLen)
   {
      if (sourceFilesNotFound == null || sourceFilesNotFound.contains(filePath)) {
         output.write(fileNameWithSpaces);
      }
      else {
         output.write("");
         output.write(fileNameWithSpaces, 0, fileNameLen);
         output.write("");
         output.write(fileNameWithSpaces, fileNameLen, fileNameWithSpaces.length - fileNameLen);
      }

      output.println("");
   }

   private void writeCodeCoverageMetricForFile(@Nonnull Metrics metric, @Nonnull PerFileCoverage coverageInfo)
   {
      int percentage = coverageInfo.getCoveragePercentage();
      int covered = coverageInfo.getCoveredItems();
      int total = coverageInfo.getTotalItems();

      coveredItems[metric.ordinal()] += covered;
      totalItems[metric.ordinal()] += total;

      printCoveragePercentage(metric, covered, total, percentage);
   }

   @Override
   protected void writeClassAttributeForCoveragePercentageCell() {}
}