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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.data;

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

import org.jetbrains.annotations.*;

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;

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

   @NotNull public PerFileLineCoverage lineCoverageInfo;
   @NotNull public PerFilePathCoverage pathCoverageInfo;
   @NotNull 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;

   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;
   }

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

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

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

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

   public int getTotalItemsForAllMetrics()
   {
      return lineCoverageInfo.getTotalItems() + pathCoverageInfo.getTotalItems() + dataCoverageInfo.getTotalItems();
   }

   void mergeWithDataFromPreviousTestRun(@NotNull 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();
   }
}