Fix issue 76--symbol table is none.

Signed-off-by: Rahul Krishna <i.m.ralk@gmail.com>

Author: rahlk

src/main/java/com/ibm/cldk/utils/AnalysisUtils.java

@@ -24,6 +24,7 @@
 import com.ibm.wala.ipa.cha.IClassHierarchy;
 import com.ibm.wala.ssa.IR;
 import com.ibm.wala.ssa.SSAConditionalBranchInstruction;
+import com.ibm.wala.ssa.SSASwitchInstruction;
 import com.ibm.wala.types.ClassLoaderReference;
 
 import java.util.*;
@@ -86,16 +87,16 @@ public static Pair<String, Callable> createAndPutNewCallableInSymbolTable(IMetho
      * @return int Cyclomatic complexity for method/constructor
      */
     public static int getCyclomaticComplexity(IR ir) {
-
-        try {
-            int branchCount = (int)Arrays.stream(ir.getInstructions())
-                    .filter(inst -> inst instanceof SSAConditionalBranchInstruction)
-                    .count();
-            return branchCount + 1;
-        } catch (NullPointerException nullPointerException) {
-            Log.error("Null pointer exception in getCyclomaticComplexity");
-            throw new RuntimeException("Could not get cyclomatic complexity.");
+        if (ir == null) {
+            return 0;
         }
+        int conditionalBranchCount = (int) Arrays.stream(ir.getInstructions())
+                .filter(inst -> inst instanceof SSAConditionalBranchInstruction)
+                .count();
+        int switchBranchCount = Arrays.stream(ir.getInstructions())
+                .filter(inst -> inst instanceof SSASwitchInstruction)
+                .map(inst -> ((SSASwitchInstruction) inst).getCasesAndLabels().length).reduce(0, Integer::sum);
+        return conditionalBranchCount + switchBranchCount + 1;
     }
 
     public static Pair<String, Callable> getCallableFromSymbolTable(IMethod method) {

src/main/java/com/ibm/cldk/utils/BuildProject.java

@@ -9,6 +9,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -158,7 +159,7 @@ private static boolean buildProject(String projectPath, String build) {
      * @return true if the streaming was successful, false otherwise.
      */
     public static List<Path> buildProjectAndStreamClassFiles(String projectPath, String build) throws IOException {
-        return buildProject(projectPath, build) ? classFilesStream(projectPath) : null;
+        return buildProject(projectPath, build) ? classFilesStream(projectPath) : new ArrayList<>();
     }
 
     /**