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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.data;

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

import mockit.coverage.*;
import mockit.coverage.dataItems.*;
import mockit.coverage.lines.*;
import mockit.coverage.paths.*;

/**
 * Coverage data gathered for the lines and branches of a single source file.
 */
public final class FileCoverageData implements Serializable
{
   private static final long serialVersionUID = 3508572808457541012L;

   @Nonnull private static final PerFileLineCoverage NO_LINE_INFO = new PerFileLineCoverage();
   @Nonnull private static final PerFilePathCoverage NO_PATH_INFO = new PerFilePathCoverage();
   @Nonnull private static final PerFileDataCoverage NO_DATA_INFO = new PerFileDataCoverage();

   @Nonnull public PerFileLineCoverage lineCoverageInfo;
   @Nonnull public PerFilePathCoverage pathCoverageInfo;
   @Nonnull public PerFileDataCoverage dataCoverageInfo;

   // Used for fast indexed access.
   public final int index;

   // Used for output styling in the HTML report:
   @Nullable public String kindOfTopLevelType;

   // Used to track the last time the ".class" file was modified, to decide if merging can be done:
   long lastModified;

   private final boolean loadedAfterTestCompletion;

   public FileCoverageData(int index, @Nullable String kindOfTopLevelType)
   {
      this.index = index;
      this.kindOfTopLevelType = kindOfTopLevelType;
      lineCoverageInfo = Metrics.LineCoverage.active ? new PerFileLineCoverage() : NO_LINE_INFO;
      pathCoverageInfo = Metrics.PathCoverage.active ? new PerFilePathCoverage() : NO_PATH_INFO;
      dataCoverageInfo = Metrics.DataCoverage.active ? new PerFileDataCoverage() : NO_DATA_INFO;
      loadedAfterTestCompletion = TestRun.isTerminated();
   }

   public boolean wasLoadedAfterTestCompletion() { return loadedAfterTestCompletion; }

   @Nonnull
   public PerFileLineCoverage getLineCoverageData() { return lineCoverageInfo; }

   public void addMethod(@Nonnull MethodCoverageData methodData) { pathCoverageInfo.addMethod(methodData); }

   @Nonnull
   public Collection getMethods() { return pathCoverageInfo.firstLineToMethodData.values(); }

   @Nonnull
   public PerFileCoverage getPerFileCoverage(@Nonnull Metrics metric)
   {
      switch (metric) {
         case LineCoverage: return lineCoverageInfo;
         case PathCoverage: return pathCoverageInfo;
         default: return dataCoverageInfo;
      }
   }

   public int getTotalItemsForAllMetrics()
   {
      int totalItems = 0;

      if (lineCoverageInfo != NO_LINE_INFO) {
         totalItems += lineCoverageInfo.getTotalItems();
      }

      if (pathCoverageInfo != NO_PATH_INFO) {
         totalItems += pathCoverageInfo.getTotalItems();
      }

      if (dataCoverageInfo != NO_DATA_INFO) {
         totalItems += dataCoverageInfo.getTotalItems();
      }

      return totalItems;
   }

   void mergeWithDataFromPreviousTestRun(@Nonnull FileCoverageData previousInfo)
   {
      if (lineCoverageInfo == NO_LINE_INFO) {
         lineCoverageInfo = previousInfo.lineCoverageInfo;
      }
      else if (previousInfo.lineCoverageInfo != NO_LINE_INFO) {
         lineCoverageInfo.mergeInformation(previousInfo.lineCoverageInfo);
      }

      if (pathCoverageInfo == NO_PATH_INFO) {
         pathCoverageInfo = previousInfo.pathCoverageInfo;
      }
      else if (previousInfo.pathCoverageInfo != NO_PATH_INFO) {
         pathCoverageInfo.mergeInformation(previousInfo.pathCoverageInfo);
      }

      if (dataCoverageInfo == NO_DATA_INFO) {
         dataCoverageInfo = previousInfo.dataCoverageInfo;
      }
      else if (previousInfo.dataCoverageInfo != NO_DATA_INFO) {
         dataCoverageInfo.mergeInformation(previousInfo.dataCoverageInfo);
      }
   }

   void reset()
   {
      lineCoverageInfo.reset();
      pathCoverageInfo.reset();
   }
}