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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.dataItems;

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

public abstract class FieldData implements Serializable
{
   private static final long serialVersionUID = 8565599590976858508L;

   int readCount;
   int writeCount;
   @Nullable Boolean covered;

   private void writeObject(@Nonnull ObjectOutputStream out) throws IOException
   {
      isCovered();
      out.defaultWriteObject();
   }

   public final int getReadCount() { return readCount; }
   public final int getWriteCount() { return writeCount; }

   public final boolean isCovered()
   {
      if (covered == null) {
         covered = false;
         markAsCoveredIfNoUnreadValuesAreLeft();
      }

      return covered;
   }

   abstract void markAsCoveredIfNoUnreadValuesAreLeft();

   final void addCountsFromPreviousTestRun(@Nonnull FieldData previousInfo)
   {
      readCount += previousInfo.readCount;
      writeCount += previousInfo.writeCount;
      covered = isCovered() || previousInfo.isCovered();
   }
}