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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.io.*;

import org.jetbrains.annotations.*;

import mockit.external.asm.*;

/**
 * Coverage data gathered for a branch inside a line of source code.
 */
public final class BranchCoverageData extends LineSegmentData
{
   private static final long serialVersionUID = 1003335601845442606L;
   static final BranchCoverageData INVALID = new BranchCoverageData(new Label());

   @NotNull private transient Label label;

   BranchCoverageData(@NotNull Label label) { this.label = label; }

   @NotNull public Label getLabel() { return label; }
   int getLine() { return label.info == null ? label.line : (Integer) label.info; }

   private void readObject(@NotNull ObjectInputStream in) throws IOException, ClassNotFoundException
   {
      label = new Label();
      label.line = in.readInt();
      in.defaultReadObject();
   }

   private void writeObject(@NotNull ObjectOutputStream out) throws IOException
   {
      int line = getLine();
      out.writeInt(line);
      out.defaultWriteObject();
   }
}