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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 org.jetbrains.annotations.*;

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

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

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

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

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

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

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

      return -1;
   }

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

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

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

      return count;
   }

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

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