First commit, added all projects

PA5/src/graph/LabelCorrectingAlgorithm.java

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+package graph;
+
+import java.util.Collections;
+import java.util.Map;
+
+import feature.Intersection;
+import feature.StreetSegment;
+
+/**
+ * Label-correcting shortest-path algorithm.
+ */
+public class LabelCorrectingAlgorithm extends AbstractShortestPathAlgorithm
+{
+  private CandidateLabelManager labels;
+
+  /**
+   * Explicit value constructor.
+   *
+   * @param labels candidate label manager
+   */
+  public LabelCorrectingAlgorithm(final CandidateLabelManager labels)
+  {
+    this.labels = labels;
+  }
+
+  @Override
+  public Map<String, StreetSegment> findPath(final int origin, final int destination,
+      final StreetNetwork net)
+  {
+    if (labels == null || net == null)
+    {
+      return Collections.emptyMap();
+    }
+
+    Label originLabel = labels.getLabel(origin);
+    if (originLabel == null)
+    {
+      return Collections.emptyMap();
+    }
+    originLabel.setValue(0.0);
+
+    Intersection originIntersection = net.getIntersection(origin);
+    if (originIntersection != null)
+    {
+      for (StreetSegment segment : originIntersection.getOutbound())
+      {
+        labels.adjustHeadValue(segment);
+        notifyStreetSegmentObservers(segment.getID());
+      }
+    }
+
+    Label current = labels.getCandidateLabel();
+    while (current != null)
+    {
+      Intersection intersection = net.getIntersection(current.getID());
+      if (intersection != null)
+      {
+        for (StreetSegment segment : intersection.getOutbound())
+        {
+          labels.adjustHeadValue(segment);
+          notifyStreetSegmentObservers(segment.getID());
+        }
+      }
+
+      current = labels.getCandidateLabel();
+    }
+
+    return buildPath(labels, origin, destination);
+  }
+}