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>

3 files changed, 137 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;
     }
diff --git a/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/ConfigurationUtilsTest.java b/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/ConfigurationUtilsTest.java
index d0b0a12297..dab8946883 100644
--- a/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/ConfigurationUtilsTest.java
+++ b/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/ConfigurationUtilsTest.java
@@ -26,8 +26,12 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertFalse;
 
+import java.io.File;
+import java.io.IOException;
 import java.lang.reflect.Array;
 import java.lang.reflect.Field;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -54,11 +58,13 @@ import org.apache.commons.configuration2.CompositeConfiguration;
 import org.apache.commons.configuration2.Configuration;
 import org.apache.commons.configuration2.PropertiesConfiguration;
 import org.junit.Test;
+import org.onap.config.util.TestUtil;
 import org.onap.config.api.Hint;
 import org.onap.config.impl.ConfigurationRepository;
 
 public class ConfigurationUtilsTest {
 
+    public static final String TMP_DIR_PREFIX = "sdc-testing-";
     private static final String TEST_NAME_SPACE = "testNameSpaceOne";
     private static final String TEST_COMPOSITE_NAMESPACE = "testCOmpositeConfig";
 
@@ -134,6 +140,53 @@ public class ConfigurationUtilsTest {
     }
 
     @Test
+    public void testGetAllFilesRecursiveIncludeAll() throws IOException {
+        Path tmpRoot = TestUtil.createTestDirsStructure(TMP_DIR_PREFIX);
+        Collection<File> allFiles = ConfigurationUtils.getAllFiles(tmpRoot.toFile(), true, false);
+        assertEquals(7, allFiles.size());
+        TestUtil.deleteTestDirsStrucuture(tmpRoot);
+    }
+
+    @Test
+    public void testGetAllFilesRecursiveIncludeDirsOnly() throws IOException {
+        Path tmpRoot = TestUtil.createTestDirsStructure(TMP_DIR_PREFIX);
+        Collection<File> allFiles = ConfigurationUtils.getAllFiles(tmpRoot.toFile(), true, true);
+        assertEquals(3, allFiles.size());
+        TestUtil.deleteTestDirsStrucuture(tmpRoot);
+    }
+
+    @Test
+    public void testGetAllFilesNonRecursiveIncludeAll() throws IOException {
+        Path tmpRoot = TestUtil.createTestDirsStructure(TMP_DIR_PREFIX);
+        Collection<File> allFiles = ConfigurationUtils.getAllFiles(tmpRoot.toFile(), false, false);
+        assertEquals(2, allFiles.size());
+        TestUtil.deleteTestDirsStrucuture(tmpRoot);
+    }
+
+    @Test
+    public void testGetAllFilesNonRecursiveIncludeDirsOnly() throws IOException {
+        Path tmpRoot = TestUtil.createTestDirsStructure(TMP_DIR_PREFIX);
+        Collection<File> allFiles = ConfigurationUtils.getAllFiles(tmpRoot.toFile(), false, true);
+        assertEquals(1, allFiles.size());
+        TestUtil.deleteTestDirsStrucuture(tmpRoot);
+    }
+
+    @Test
+    public void testGetAllFilesEmptyDir() throws IOException {
+        Path tmpRoot = TestUtil.createEmptyTmpDir(TMP_DIR_PREFIX);
+        Collection<File> allFiles = ConfigurationUtils.getAllFiles(tmpRoot.toFile(), true, true);
+        assertEquals(0, allFiles.size());
+        TestUtil.deleteTestDirsStrucuture(tmpRoot);
+    }
+
+    @Test
+    public void testGetAllFilesNonExistentDir() throws IOException {
+        Path nonExistentDir = Paths.get("/tmp/nonexistentdir");
+        Collection<File> allFiles = ConfigurationUtils.getAllFiles(nonExistentDir.toFile(), false, true);
+        assertEquals(0, allFiles.size());
+    }
+
+    @Test
     public void testGetConfigPropertyBaseConfig() throws Exception {
         ConfigurationRepository repo = populateTestBaseConfig();
         Configuration config = repo.getConfigurationFor(Constants.DEFAULT_TENANT, TEST_NAME_SPACE);
diff --git a/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/util/TestUtil.java b/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/util/TestUtil.java
index 87ff4ba394..28611d44c8 100644
--- a/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/util/TestUtil.java
+++ b/common/onap-common-configuration-management/onap-configuration-management-core/src/test/java/org/onap/config/util/TestUtil.java
@@ -19,6 +19,12 @@ package org.onap.config.util;
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
 import java.util.List;
 import org.junit.Assert;
@@ -104,4 +110,56 @@ public class TestUtil {
         String value = System.getenv(name);
         return value == null ? "" : value;
     }
+
+    /**
+     * Creates temporary directories structure with files inside every directory
+     *
+     * @param tmpDirPrefix
+     * @return
+     * @throws IOException
+     */
+    public static Path createTestDirsStructure(String tmpDirPrefix) throws IOException {
+        Path tmpPath = Files.createTempDirectory(tmpDirPrefix);
+        Path dir0 = Paths.get(tmpPath.toString(), "dir0", "dir1", "dir2");
+        Files.createDirectories(dir0);
+        Path[] files= {
+                Paths.get(tmpPath.toString(), "file001"),
+                Paths.get(tmpPath.toString(), "dir0", "file002"),
+                Paths.get(tmpPath.toString(), "dir0", "dir1", "file003"),
+                Paths.get(tmpPath.toString(), "dir0", "dir1", "dir2", "file004"),
+        };
+        for (Path file : files ) {
+            Files.createFile(file);
+        }
+        return tmpPath;
+    }
+
+    public static Path createEmptyTmpDir(String prefix) throws IOException {
+        return Files.createTempDirectory(prefix);
+    }
+
+    /**
+     * Delete all tmp directories and files created for testing
+     *
+     * @param rootPath
+     */
+    public static void deleteTestDirsStrucuture(Path rootPath) {
+        try {
+            Files.walkFileTree(rootPath, new SimpleFileVisitor<Path>() {
+                @Override
+                public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
+                    Files.delete(dir);
+                    return FileVisitResult.CONTINUE;
+                }
+
+                @Override
+                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                    Files.delete(file);
+                    return FileVisitResult.CONTINUE;
+                }
+            });
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
 }