diff --git a/build.gradle b/build.gradle
index d5f000a..88a7743 100644
--- a/build.gradle
+++ b/build.gradle
@@ -44,8 +44,8 @@ ext {
 
 compileJava.options.encoding = 'UTF-8'
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 sourceSets {
     main {
diff --git a/src/de/steamwar/sql/NodeDownload.java b/src/de/steamwar/sql/NodeDownload.java
index 666cf68..54d81b5 100644
--- a/src/de/steamwar/sql/NodeDownload.java
+++ b/src/de/steamwar/sql/NodeDownload.java
@@ -20,9 +20,11 @@
 package de.steamwar.sql;
 
 import de.steamwar.sql.internal.Field;
+import de.steamwar.sql.internal.SelectStatement;
 import de.steamwar.sql.internal.Statement;
 import de.steamwar.sql.internal.Table;
 import lombok.AllArgsConstructor;
+import lombok.Getter;
 
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -30,13 +32,13 @@ import java.sql.Timestamp;
 import java.time.Instant;
 
 @AllArgsConstructor
+@Getter
 public class NodeDownload {
-
-    private static final char[] HEX = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
-    private static final String LINK_BASE = "https://steamwar.de/download.php?schem=";
-
     private static final Table<NodeDownload> table = new Table<>(NodeDownload.class);
     private static final Statement insert = table.insertFields("NodeId", "Link");
+    private static final SelectStatement<NodeDownload> select = table.selectFields("Link");
+    private static final SelectStatement<NodeDownload> getId = table.select(Table.PRIMARY);
+    private static final Statement delete = table.delete(Table.PRIMARY);
 
     @Field(keys = {Table.PRIMARY})
     private final int nodeId;
@@ -45,25 +47,20 @@ public class NodeDownload {
     @Field(def = "CURRENT_TIMESTAMP")
     private final Timestamp timestamp;
 
-    public static String getLink(SchematicNode schem){
-        if(schem.isDir())
-            throw new SecurityException("Can not Download Directorys");
-        MessageDigest digest;
-        try {
-            digest = MessageDigest.getInstance("SHA-1");
-        } catch (NoSuchAlgorithmException e) {
-            throw new SecurityException(e);
-        }
-        digest.reset();
-        digest.update((Instant.now().toString() + schem.getOwner() + schem.getId()).getBytes());
-        String hash = base16encode(digest.digest());
-        insert.update(schem.getId(), hash);
-        return LINK_BASE + hash;
+    public static NodeDownload addCode(SchematicNode node, String link) {
+        insert.update(node.getId(), link);
+        return get(node.getId());
     }
-    public static String base16encode(byte[] byteArray) {
-        StringBuilder hexBuffer = new StringBuilder(byteArray.length * 2);
-        for (byte b : byteArray)
-            hexBuffer.append(HEX[(b >>> 4) & 0xF]).append(HEX[b & 0xF]);
-        return hexBuffer.toString();
+
+    public static NodeDownload get(int nodeId) {
+        return getId.select(nodeId);
+    }
+
+    public static NodeDownload get(String link) {
+        return select.select(link);
+    }
+
+    public void delete() {
+        delete.update(nodeId);
     }
 }
diff --git a/src/de/steamwar/sql/SchematicNode.java b/src/de/steamwar/sql/SchematicNode.java
index 6aa83e1..b9f86d8 100644
--- a/src/de/steamwar/sql/SchematicNode.java
+++ b/src/de/steamwar/sql/SchematicNode.java
@@ -383,8 +383,8 @@ public class SchematicNode {
     }
 
     public int getRank() {
-        if(isDir())
-            throw new SecurityException("Node is Directory");
+        if (isDir())
+            return 0;
         return nodeRank;
     }
 
@@ -400,8 +400,8 @@ public class SchematicNode {
     }
 
     public SchematicType getSchemtype() {
-        if(isDir())
-            throw new SecurityException("Is Directory");
+        if (isDir())
+            return null;
         return nodeType;
     }
 
@@ -443,8 +443,25 @@ public class SchematicNode {
         return SchemElo.getElo(this, season);
     }
 
-    public boolean accessibleByUser(int user) {
-        return NodeMember.getNodeMember(nodeId, user) != null;
+    public boolean accessibleByUser(SteamwarUser user) {
+        if (user.getId() == nodeOwner) {
+            return true;
+        }
+
+        if (parentNode == null) {
+            return false;
+        }
+
+        SchematicNode parent = getParentNode();
+        while (parent != null) {
+            NodeMember member = NodeMember.getNodeMember(nodeId, user.getId());
+            if (member != null || (parent.getOwner() == user.getId() && parent.parentNode == null)) {
+                return true;
+            }
+            parent = parent.getParentNode();
+        }
+
+        return false;
     }
 
     public Set<NodeMember> getMembers() {
@@ -506,6 +523,19 @@ public class SchematicNode {
         return builder.toString();
     }
 
+    public List<Map.Entry<String, Integer>> generateBreadcrumbsMap(SteamwarUser user) {
+        List<Map.Entry<String, Integer>> map = new ArrayList<>();
+        Optional<SchematicNode> currentNode = Optional.of(this);
+        if(currentNode.map(SchematicNode::isDir).orElse(false)) {
+            map.add(Map.entry(getName(), getId()));
+        }
+        while (currentNode.isPresent()) {
+            currentNode = currentNode.flatMap(schematicNode -> Optional.ofNullable(NodeMember.getNodeMember(schematicNode.getId(), effectiveOwner)).map(NodeMember::getParent).orElse(schematicNode.getOptionalParent())).map(SchematicNode::getSchematicNode);
+            currentNode.ifPresent(node -> map.add(0, Map.entry(node.getName(), node.getId())));
+        }
+        return map;
+    }
+
     private static final List<String> FORBIDDEN_NAMES = Collections.unmodifiableList(Arrays.asList("public"));
     public static boolean invalidSchemName(String[] layers) {
         for (String layer : layers) {