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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;

import javax.annotation.*;

import mockit.coverage.data.*;
import mockit.coverage.lines.*;
import mockit.coverage.testRedundancy.*;

@SuppressWarnings("unused")
public final class TestRun
{
   private static boolean terminated;

   private TestRun() {}

   public static void lineExecuted(int fileIndex, int line)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         PerFileLineCoverage fileData = coverageData.getFileData(fileIndex).lineCoverageInfo;
         CallPoint callPoint = null;

         if (coverageData.isWithCallPoints() && fileData.acceptsAdditionalCallPoints(line)) {
            callPoint = CallPoint.create(new Throwable());
         }

         int previousExecutionCount = fileData.registerExecution(line, callPoint);
         TestCoverage.INSTANCE.recordNewItemCoveredByTestIfApplicable(previousExecutionCount);
      }
   }

   public static void branchExecuted(int fileIndex, int line, int branchIndex)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         PerFileLineCoverage fileData = coverageData.getFileData(fileIndex).lineCoverageInfo;

         if (fileData.hasValidBranch(line, branchIndex)) {
            CallPoint callPoint = null;

            if (coverageData.isWithCallPoints() && fileData.acceptsAdditionalCallPoints(line, branchIndex)) {
               callPoint = CallPoint.create(new Throwable());
            }

            int previousExecutionCount = fileData.registerExecution(line, branchIndex, callPoint);
            TestCoverage.INSTANCE.recordNewItemCoveredByTestIfApplicable(previousExecutionCount);
         }
      }
   }

   public static void nodeReached(@Nonnull String file, int firstLineInMethodBody, int node)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         FileCoverageData fileData = coverageData.getFileData(file);

         int previousExecutionCount = fileData.pathCoverageInfo.registerExecution(firstLineInMethodBody, node);
         TestCoverage.INSTANCE.recordNewItemCoveredByTestIfApplicable(previousExecutionCount);
      }
   }

   public static void fieldAssigned(@Nonnull String file, @Nonnull String classAndFieldNames)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         FileCoverageData fileData = coverageData.getFileData(file);
         fileData.dataCoverageInfo.registerAssignmentToStaticField(classAndFieldNames);
      }
   }

   public static void fieldRead(@Nonnull String file, @Nonnull String classAndFieldNames)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         FileCoverageData fileData = coverageData.getFileData(file);
         fileData.dataCoverageInfo.registerReadOfStaticField(classAndFieldNames);
      }
   }

   public static void fieldAssigned(@Nonnull Object instance, @Nonnull String file, @Nonnull String classAndFieldNames)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         FileCoverageData fileData = coverageData.getFileData(file);
         fileData.dataCoverageInfo.registerAssignmentToInstanceField(instance, classAndFieldNames);
      }
   }

   public static void fieldRead(@Nonnull Object instance, @Nonnull String file, @Nonnull String classAndFieldNames)
   {
      if (terminated) return;

      synchronized (TestRun.class) {
         CoverageData coverageData = CoverageData.instance();
         FileCoverageData fileData = coverageData.getFileData(file);
         fileData.dataCoverageInfo.registerReadOfInstanceField(instance, classAndFieldNames);
      }
   }

   static void terminate() { terminated = true; }
   public static boolean isTerminated() { return terminated; }
}