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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.lines;

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

import mockit.coverage.*;
import mockit.external.asm.*;

/**
 * Coverage data gathered for a single executable line of code in a source file.
 */
public final class LineCoverageData extends LineSegmentData
{
   private static final long serialVersionUID = -6233980722802474992L;

   // Static data:
   @Nonnull private List branches;
   private transient int segments;

   LineCoverageData() { branches = Collections.emptyList(); }

   public int addBranchingPoint(@Nonnull Label jumpSource, @Nonnull Label jumpTarget)
   {
      int initialIndex = branches.size();

      if (initialIndex == 0) {
         branches = new ArrayList(4);
      }

      branches.add(new BranchCoverageData(jumpSource));
      branches.add(new BranchCoverageData(jumpTarget));
      return initialIndex;
   }

   void markLastSegmentAsEmpty()
   {
      BranchCoverageData lastBranch = branches.get(branches.size() - 1);
      lastBranch.markAsEmpty();
   }

   public boolean noBranchesYet() { return branches == Collections.emptyList(); }

   @Nonnull public BranchCoverageData getBranchData(int index) { return branches.get(index); }

   boolean acceptsAdditionalCallPoints(int branchIndex)
   {
      BranchCoverageData data = branches.get(branchIndex);
      return data.acceptsAdditionalCallPoints();
   }

   int registerExecution(int branchIndex, @Nullable CallPoint callPoint)
   {
      BranchCoverageData data = branches.get(branchIndex);
      return data.registerExecution(callPoint);
   }

   public boolean containsBranches() { return !noBranchesYet(); }

   @Nonnull public List getBranches() { return branches; }

   public boolean isValidBranch(int branchIndex) { return branches.get(branchIndex) != BranchCoverageData.INVALID; }

   public int getNumberOfSegments()
   {
      int previouslyCounted = segments;

      if (previouslyCounted > 0) {
         return previouslyCounted;
      }

      int n = branches.size();

      if (n == 0) {
         return 1;
      }

      int count = 1;

      for (int targetBranchIndex = 1; targetBranchIndex < n; targetBranchIndex += 2) {
         BranchCoverageData targetBranch = branches.get(targetBranchIndex);
         int targetLine = targetBranch.getLine();

         if (targetLine > 0) {
            BranchCoverageData sourceBranch = branches.get(targetBranchIndex - 1);
            int sourceLine = sourceBranch.getLine();

            if (targetLine == sourceLine) {
               count++;
            }

            if (!targetBranch.isEmpty()) {
               count++;
            }
         }
      }

      segments = count;
      return count;
   }

   public int getNumberOfCoveredSegments()
   {
      int segmentsCovered = executionCount > 0 ? 1 : 0;
      int n = branches.size();

      if (n == 0) {
         return segmentsCovered;
      }

      for (int sourceBranchIndex = 0; sourceBranchIndex < n; sourceBranchIndex += 2) {
         BranchCoverageData sourceBranch = branches.get(sourceBranchIndex);
         BranchCoverageData targetBranch = branches.get(sourceBranchIndex + 1);

         if (sourceBranch.isCovered() && !targetBranch.isEmpty()) {
            segmentsCovered++;
         }

         if (targetBranch.isCovered()) {
            int targetLine = targetBranch.getLine();

            if (targetLine == sourceBranch.getLine()) {
               segmentsCovered++;
            }
         }
      }

      return segmentsCovered;
   }

   public int getNumberOfBranchingSourcesAndTargets()
   {
      int n = branches.size();

      if (n == 0) {
         return 0;
      }

      int count = 0;

      for (int sourceBranchIndex = 0; sourceBranchIndex < n; sourceBranchIndex += 2) {
         BranchCoverageData sourceBranch = branches.get(sourceBranchIndex);
         BranchCoverageData targetBranch = branches.get(sourceBranchIndex + 1);

         if (!sourceBranch.isEmpty()) {
            count++;
         }

         count++;
      }

      return count;
   }

   public int getNumberOfCoveredBranchingSourcesAndTargets()
   {
      int n = branches.size();

      if (n == 0) {
         return 0;
      }

      int sourcesAndTargetsCovered = 0;

      for (int sourceBranchIndex = 0; sourceBranchIndex < n; sourceBranchIndex += 2) {
         BranchCoverageData sourceBranch = branches.get(sourceBranchIndex);
         BranchCoverageData targetBranch = branches.get(sourceBranchIndex + 1);

         if (sourceBranch.isCovered()) {
            sourcesAndTargetsCovered++;
         }

         if (targetBranch.isCovered()) {
            int targetLine = targetBranch.getLine();

            if (targetLine == sourceBranch.getLine()) {
               sourcesAndTargetsCovered++;
            }
         }
      }

      return sourcesAndTargetsCovered;
   }

   void addCountsFromPreviousTestRun(@Nonnull LineCoverageData previousData)
   {
      addExecutionCountAndCallPointsFromPreviousTestRun(previousData);

      if (containsBranches()) {
         for (int i = 0, n = branches.size(); i < n; i++) {
            BranchCoverageData segmentData = branches.get(i);
            BranchCoverageData previousSegmentData = previousData.branches.get(i);

            segmentData.addExecutionCountAndCallPointsFromPreviousTestRun(previousSegmentData);
         }
      }
   }

   @Override
   void reset()
   {
      super.reset();

      for (BranchCoverageData branchData : branches) {
         branchData.reset();
      }
   }
}