Fixing minor bugs

SpigotCore_Main/src/de/steamwar/sql/SchematicNode.java

@@ -30,6 +30,7 @@ import java.sql.Blob;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.*;
+import java.util.function.Predicate;
 
 public class SchematicNode {
 
@@ -184,7 +185,8 @@ public class SchematicNode {
     }
 
     public static List<SchematicNode> getSchematicsOfType(int owner, String schemType, Integer parent) {
-        List<SchematicNode> schems = getAllSchematicsOfType(owner, schemType);
+        List<SchematicNode> schems = getAllSchematicsAccessibleByUser(owner);
+        schems.removeIf(node -> !node.getType().equals(schemType));
         Map<Integer, SchematicNode> nodesInParent = new LinkedHashMap<>();
         for (SchematicNode schematicNode : schems) {
             SchematicNode currentNode = schematicNode;
@@ -222,7 +224,7 @@ public class SchematicNode {
                 throw new SecurityException("Failed listing schematics", e);
             }
         }
-        return null;
+        return Collections.emptyList();
     }
 
     public static List<SchematicNode> getAllSchematicsAccessibleByUser(int user) {
@@ -237,15 +239,29 @@ public class SchematicNode {
         }
     }
 
+    public static List<SchematicNode> deepGet(Integer parent, Predicate<SchematicNode> filter) {
+        List<SchematicNode> finalList = new ArrayList<>();
+        List<SchematicNode> nodes = SchematicNode.getSchematicNodeInNode(parent);
+        nodes.forEach(node -> {
+            if(node.isDir()) {
+                finalList.addAll(deepGet(node.getId(), filter));
+            }else {
+                if(filter.test(node))
+                    finalList.add(node);
+            }
+        });
+        return finalList;
+    }
+
     private final int id;
     private final int owner;
     private String name;
-    private int parent;
+    private Integer parent;
     private String item;
     private String type;
     private boolean schemFormat;
     private int rank;
-    private boolean isDir;
+    private final boolean isDir;
 
     private SchematicNode(ResultSet set) throws SQLException {
         id = set.getInt("NodeId");
@@ -353,7 +369,7 @@ public class SchematicNode {
 
     private void updateDB() {
         SQL.update("UPDATE SchematicNode SET NodeName = ?, NodeOwner = ?, ParentNode = ?, NodeItem = ?, NodeType = ?, NodeRank = ? WHERE NodeId = ?",
-                name, owner, parent, item, type, rank, id);
+                name, owner, parent == 0?null:parent, item, type, rank, id);
     }
 
     public void delete() {