Fixing sonar issue

Getting rid of nested ifs-fors

Change-Id: I71ef686683b7070614c27aabbf6cd058b5d35ffd
Issue-ID: SDC-2654
Signed-off-by: Dmitry Puzikov <d.puzikov2@partner.samsung.com>

1 files changed, 26 insertions, 11 deletions

diff --git a/common/onap-common-configuration-management/onap-configuration-management-core/src/main/java/org/onap/config/ConfigurationUtils.java b/common/onap-common-configuration-management/onap-configuration-management-core/src/main/java/org/onap/config/ConfigurationUtils.java
index df382143c6..17e9ef048f 100644
--- a/common/onap-common-configuration-management/onap-configuration-management-core/src/main/java/org/onap/config/ConfigurationUtils.java
+++ b/common/onap-common-configuration-management/onap-configuration-management-core/src/main/java/org/onap/config/ConfigurationUtils.java
@@ -44,6 +44,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.File;
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
@@ -51,7 +52,10 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
+import java.nio.file.FileVisitResult;
 import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -113,20 +117,31 @@ public class ConfigurationUtils {
     }
 
     public static Collection<File> getAllFiles(File file, boolean recursive, boolean onlyDirectory) {
-
         ArrayList<File> collection = new ArrayList<>();
-        if (file.isDirectory() && file.exists()) {
-            File[] files = file.listFiles();
-            for (File innerFile : Objects.requireNonNull(files)) {
-                if (innerFile.isFile() && !onlyDirectory) {
-                    collection.add(innerFile);
-                } else if (innerFile.isDirectory()) {
-                    collection.add(innerFile);
-                    if (recursive) {
-                        collection.addAll(getAllFiles(innerFile, true, onlyDirectory));
+        Path rootPath = file.toPath();
+        try {
+            Files.walkFileTree(rootPath, new SimpleFileVisitor<Path>() {
+                @Override
+                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
+                    super.preVisitDirectory(dir,attrs);
+                    if (rootPath.equals(dir)) {
+                        return FileVisitResult.CONTINUE;
                     }
+                    collection.add(dir.toFile());
+                    return recursive? FileVisitResult.CONTINUE : FileVisitResult.SKIP_SUBTREE;
                 }
-            }
+
+                @Override
+                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                    super.visitFile(file, attrs);
+                    if (!onlyDirectory) {
+                        collection.add(file.toFile());
+                    }
+                    return FileVisitResult.CONTINUE;
+                }
+            });
+        } catch (IOException e) {
+            LOGGER.error("Failed to walk through directories starting from: {}.", file.toString(), e);
         }
         return collection;
     }