First commit

Homework 8/src/grading/TotalStrategy.java

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+package grading;
+
+import java.util.List;
+
+/**
+ * An implementation GradingStrategy that simply totals the scores for all grades.
+ */
+public class TotalStrategy implements GradingStrategy
+{
+  /**
+   * Creates a new instance of TotalStrategy.
+   */
+  public TotalStrategy()
+  {
+  }
+
+  /**
+   * @param key
+   *          The key of the final totaled grade
+   * @param grades
+   *          The list of grades to calculate the final total grade from
+   * @return A new grade representing the total of grades
+   */
+  public Grade calculate(final String key, final List<Grade> grades) throws SizeException
+  {
+    if (grades == null || grades.isEmpty())
+    {
+      throw new SizeException();
+    }
+
+    Double total = 0.0;
+
+    for (Grade grade : grades)
+    {
+      total += Missing.doubleValue(grade.getValue());
+    }
+
+    return new LeafGrade(key, total);
+  }
+}