Cyclomatic complexity computation for analysis level 1

Signed-off-by: Saurabh Sinha <[email protected]>

Author: sinha108

src/main/java/com/ibm/cldk/SymbolTable.java

@@ -10,7 +10,7 @@
 import com.github.javaparser.ast.body.*;
 import com.github.javaparser.ast.expr.*;
 import com.github.javaparser.ast.nodeTypes.NodeWithName;
-import com.github.javaparser.ast.stmt.BlockStmt;
+import com.github.javaparser.ast.stmt.*;
 import com.github.javaparser.ast.type.ReferenceType;
 import com.github.javaparser.ast.type.Type;
 import com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration;
@@ -301,11 +301,33 @@ private static Pair<String, Callable> processCallableDeclaration(CallableDeclara
         callableNode.setAccessedFields(getAccessedFields(body, classFields, typeName));
         callableNode.setCallSites(getCallSites(body));
         callableNode.setVariableDeclarations(getVariableDeclarations(body));
+        callableNode.setCyclomaticComplexity(getCyclomaticComplexity(callableDecl));
 
         String callableSignature = (callableDecl instanceof MethodDeclaration) ? callableDecl.getSignature().asString() : callableDecl.getSignature().asString().replace(callableDecl.getSignature().getName(), "<init>");
         return Pair.of(callableSignature, callableNode);
     }
 
+    /**
+     * Computes cyclomatic complexity for the given callable.
+     *
+     * @param callableDeclaration Callable to compute cyclomatic complexity for
+     * @return cyclomatic complexity
+     */
+    private static int getCyclomaticComplexity(CallableDeclaration callableDeclaration) {
+        int ifStmtCount = callableDeclaration.findAll(IfStmt.class).size();
+        int loopStmtCount = callableDeclaration.findAll(DoStmt.class).size() +
+            callableDeclaration.findAll(ForStmt.class).size() +
+                callableDeclaration.findAll(ForEachStmt.class).size() +
+                callableDeclaration.findAll(WhileStmt.class).size();
+        int switchCaseCount = callableDeclaration.findAll(SwitchStmt.class).stream()
+                .map(stmt -> stmt.getEntries().size())
+                .reduce(0, Integer::sum);
+        int conditionalExprCount = callableDeclaration.findAll(ConditionalExpr.class).size();
+        int catchClauseCount = callableDeclaration.findAll(CatchClause.class).size();
+        int cyclomaticComplexity = ifStmtCount + loopStmtCount + switchCaseCount + conditionalExprCount + catchClauseCount + 1;
+        return cyclomaticComplexity;
+    }
+
     /**
      * Processes the given field declaration to extract information about the
      * declared field and