Avoid unecessary operations in kb-importer

kb-importer/src/main/java/org/eclipse/steady/kb/command/Import.java

@@ -38,6 +38,7 @@
 import org.eclipse.steady.kb.util.Metadata;
 import org.eclipse.steady.shared.util.FileUtil;
 import org.eclipse.steady.shared.util.VulasConfiguration;
+import org.eclipse.steady.backend.BackendConnectionException;
 
 /**
  * import command
@@ -49,6 +50,7 @@ public class Import implements Command {
   private static final String DIRECTORY_OPTION = "d";
   private static final String OVERWRITE_OPTION = "o";
   private static final String VERBOSE_OPTION = "v";
+  private static final String DELETE = "del";
 
   private static final String UPLOAD_LONG_OPTION = "upload";
   private static final String VERBOSE_LONG_OPTION = "verbose";
@@ -116,6 +118,25 @@ private void importVuln(HashMap<String, Object> args, String dirPath) {
       return;
     }
 
+    String vulnId = vuln.getVulnId();
+    boolean bugExists = false;
+    try {
+      bugExists = BackendConnector.getInstance().isBugExisting(vulnId);
+    } catch (BackendConnectionException e) {
+      log.error("Can't connect to the Backend");
+      return;
+    }
+
+    Boolean overwrite = (Boolean) args.get(OVERWRITE_OPTION);
+    if (bugExists) {
+      if (overwrite) {
+        args.put(DELETE, true);
+      } else {
+        log.info("Bug [{}] already exists in backend, analysis will be skipped", vulnId);
+        return;
+      }
+    }
+
     List<Task> importTasks = TaskProvider.getInstance().getTasks(Command.NAME.IMPORT);
 
     for (Task task : importTasks) {

kb-importer/src/main/java/org/eclipse/steady/kb/task/ImportAffectedLibraries.java

@@ -46,6 +46,7 @@
  */
 public class ImportAffectedLibraries implements Task {
   private static final String OVERWRITE_OPTION = "o";
+  private static final String DELETE = "del";
   private static final Logger log = org.apache.logging.log4j.LogManager.getLogger();
 
   /** {@inheritDoc} */
@@ -56,6 +57,9 @@ public void execute(
     if (artifacts == null || artifacts.isEmpty()) {
       return;
     }
+    if (args.containsKey(DELETE) && (boolean) args.get(DELETE)) {
+      backendConnector.deletePatchEvalResults(vuln.getVulnId(), AffectedVersionSource.KAYBEE);
+    }
 
     List<AffectedLibrary> affectedLibsToUpsert = new ArrayList<AffectedLibrary>();
     HashSet<org.eclipse.steady.shared.json.model.Artifact> ciaArtifactsCache = new HashSet<>();

kb-importer/src/main/java/org/eclipse/steady/kb/task/ImportVulnerability.java

@@ -56,6 +56,7 @@ public class ImportVulnerability implements Task {
   private static final String OVERWRITE_OPTION = "o";
   private static final String DIRECTORY_OPTION = "d";
   private static final String VERBOSE_OPTION = "v";
+  private static final String DELETE = "del";
 
   private static final Logger log = org.apache.logging.log4j.LogManager.getLogger();
   private BackendConnector backendConnector = null;
@@ -67,9 +68,10 @@ public void execute(
     String vulnId = vuln.getVulnId();
     this.backendConnector = _backendConnector;
 
-    Boolean overwrite = (Boolean) args.get(OVERWRITE_OPTION);
-    if (!overwrite && getBackendConnector().isBugExisting(vulnId)) {
-      log.info("Bug [{}] already exists in backend, analysis will be skipped", vulnId);
+    if (args.containsKey(DELETE) && (boolean) args.get(DELETE)) {
+      backendConnector.deleteBug(vuln.getVulnId());
+    } else if (backendConnector.isBugExisting(vuln.getVulnId())) {
+      log.info("Bug [{}] already exists in backend, analysis will be skipped", vuln.getVulnId());
       return;
     }
 

lang/src/main/java/org/eclipse/steady/backend/BackendConnector.java

@@ -1041,6 +1041,21 @@ public void uploadChangeList(String _bug, String _json) throws BackendConnection
     req_list.send();
   }
 
+  /**
+   * <p>deleteBug.</p>
+   *
+   * @param _bugId a {@link java.lang.String} object.
+   * @throws org.eclipse.steady.backend.BackendConnectionException if any.
+   */
+  public void deleteBug(String _bugId) throws BackendConnectionException {
+
+    final BasicHttpRequest del_req =
+        new BasicHttpRequest(HttpMethod.DELETE, PathBuilder.bug(_bugId));
+    // payload cannot be empty otherwise request doesn t work
+    del_req.setPayload("[]", "application/json", true);
+    del_req.send();
+  }
+
   /**
    * <p>uploadCheckVersionResults.</p>
    *