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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.paths;

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

public final class Path implements Serializable
{
   private static final long serialVersionUID = 8895491272907955543L;

   @Nonnull final List nodes = new ArrayList(4);
   @Nonnull private final AtomicInteger executionCount = new AtomicInteger();
   private final boolean shadowed;
   @Nullable private Path shadowPath;

   Path(@Nonnull Node.Entry entryNode)
   {
      shadowed = false;
      addNode(entryNode);
   }

   Path(@Nonnull Path sharedSubPath, boolean shadowed)
   {
      this.shadowed = shadowed;
      sharedSubPath.shadowPath = shadowed ? this : null;
      nodes.addAll(sharedSubPath.nodes);
   }

   void addNode(@Nonnull Node node) { nodes.add(node); }

   int countExecutionIfAllNodesWereReached(@Nonnull List nodesReached)
   {
      boolean allNodesReached = nodes.equals(nodesReached);

      if (allNodesReached) {
         return executionCount.getAndIncrement();
      }

      return -1;
   }

   public boolean isShadowed() { return shadowed; }
   @Nonnull public List getNodes() { return nodes; }

   public int getExecutionCount()
   {
      int count = executionCount.get();

      if (shadowPath != null) {
         count += shadowPath.executionCount.get();
      }

      return count;
   }

   void addCountFromPreviousTestRun(@Nonnull Path previousPath)
   {
      int currentExecutionCount = executionCount.get();
      int previousExecutionCount = previousPath.executionCount.get();
      executionCount.set(currentExecutionCount + previousExecutionCount);
   }

   void reset()
   {
      executionCount.set(0);
   }
}