Implement load and save of Profiler

graphwalker-core/src/main/java/org/graphwalker/core/statistics/SimpleProfiler.java

@@ -200,4 +200,21 @@ public List<Profile> getProfiles() {
   public Profile getProfile(Context context, Element element) {
     return new Profile(context, element, executions.get(context).get(element));
   }
+
+  public static SimpleProfiler createFromExecutionPath(List<Execution> executionPath) {
+    SimpleProfiler profiler = new SimpleProfiler();
+    for (Execution execution : executionPath) {
+      Context context = execution.getContext();
+      if (!profiler.executions.containsKey(context)) {
+        profiler.executions.put(context, new HashMap<>());
+      }
+      Element element = execution.getElement();
+      if (!profiler.executions.get(context).containsKey(element)) {
+        profiler.executions.get(context).put(element, new ArrayList<>());
+      }
+      profiler.executionPath.add(execution);
+      profiler.executions.get(context).get(element).add(execution);
+    }
+    return profiler;
+  }
 }

graphwalker-core/src/test/java/org/graphwalker/core/machine/ReplayMachineTest.java

@@ -27,14 +27,18 @@
  */
 
 import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertThat;
 
 import org.graphwalker.core.condition.EdgeCoverage;
 import org.graphwalker.core.generator.RandomPath;
 import org.graphwalker.core.model.*;
 import org.graphwalker.core.statistics.Execution;
+import org.graphwalker.core.statistics.SimpleProfiler;
 import org.junit.Test;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -57,6 +61,37 @@ public void replayMachine() throws Exception {
     assertThat(replayedPath, is(expectedPath));
   }
 
+  @Test
+  public void replayMachineFromExecutionPath() {
+    Machine machine = createMachineExecution();
+    List<Execution> executionPath = new ArrayList<>(machine.getProfiler().getExecutionPath());
+    Machine replayMachine = new ReplayMachine(SimpleProfiler.createFromExecutionPath(executionPath));
+    while (replayMachine.hasNextStep()) {
+      replayMachine.getNextStep();
+    }
+    List<Element> expectedPath = machine.getProfiler().getExecutionPath().stream()
+      .map(Execution::getElement).collect(Collectors.toList());
+    List<Element> replayedPath = replayMachine.getProfiler().getExecutionPath().stream()
+      .map(Execution::getElement).collect(Collectors.toList());
+    assertEquals(expectedPath, replayedPath);
+  }
+
+  @Test
+  public void replayMachineFromAlteredExecutionPath() {
+    Machine machine = createMachineExecution();
+    List<Execution> executionPath = new ArrayList<>(machine.getProfiler().getExecutionPath());
+    executionPath.remove(executionPath.size() - 1);
+    Machine replayMachine = new ReplayMachine(SimpleProfiler.createFromExecutionPath(executionPath));
+    while (replayMachine.hasNextStep()) {
+      replayMachine.getNextStep();
+    }
+    List<Element> originalPath = machine.getProfiler().getExecutionPath().stream()
+      .map(Execution::getElement).collect(Collectors.toList());
+    List<Element> replayedPath = replayMachine.getProfiler().getExecutionPath().stream()
+      .map(Execution::getElement).collect(Collectors.toList());
+    assertNotEquals(originalPath, replayedPath);
+  }
+
   private Machine createMachineExecution() {
     Vertex vertex = new Vertex();
     Edge edge1 = new Edge().setSourceVertex(vertex).setTargetVertex(vertex).addAction(new Action("flag = true;")).setName("edge1");