示例#1
0
        public byte[] Get(TrieNode node, TrieKey key)
        {
            if (node == null)
            {
                return(null);
            }

            if (node.NodeType == TrieNode.TrieNodeType.BranchNode)
            {
                if (key.IsEmpty)
                {
                    return(node.BranchNodeGetValue());
                }
                TrieNode child = node.BranchNodeGetChild(key.GetHex(0));
                return(Get(child, key.Shift(1)));
            }
            else
            {
                TrieKey k = key.MatchAndShift(node.KVNodeGetKey());
                if (k == null)
                {
                    return(null);
                }

                if (node.NodeType == TrieNode.TrieNodeType.KVNodeValue)
                {
                    return(k.IsEmpty ? node.KVNodeGetValue() : null);
                }
                else
                {
                    return(Get(node.KVNodeGetChildNode(), k));
                }
            }
        }
示例#2
0
        private TrieNode Insert(TrieNode node, TrieKey key, object node_or_value)
        {
            if (node.NodeType == TrieNode.TrieNodeType.BranchNode)
            {
                if (key.IsEmpty)
                {
                    return(node.BranchNodeSetValue((byte[])node_or_value));
                }
                TrieNode child = node.BranchNodeGetChild(key.GetHex(0));
                if (child != null)
                {
                    return(node.BranchNodeSetChild(key.GetHex(0), Insert(child, key.Shift(1), node_or_value)));
                }
                else
                {
                    TrieKey  child_key = key.Shift(1);
                    TrieNode new_child;
                    if (!child_key.IsEmpty)
                    {
                        new_child = new TrieNode(this, child_key, node_or_value);
                    }
                    else
                    {
                        new_child = node_or_value is TrieNode ? (TrieNode)node_or_value : new TrieNode(this, child_key, node_or_value);
                    }
                    return(node.BranchNodeSetChild(key.GetHex(0), new_child));
                }
            }
            else
            {
                TrieKey current_node_key = node.KVNodeGetKey();
                TrieKey common_prefix    = key.GetCommonPrefix(current_node_key);
                if (common_prefix.IsEmpty)
                {
                    TrieNode new_branch = new TrieNode(this);
                    Insert(new_branch, current_node_key, node.KVNodeGetValueOrNode());
                    Insert(new_branch, key, node_or_value);
                    node.Dispose();
                    return(new_branch);
                }
                else if (common_prefix.Equals(key))
                {
                    return(node.KVNodeSetValueOrNode(node_or_value));
                }
                else if (common_prefix.Equals(current_node_key))
                {
                    Insert(node.KVNodeGetChildNode(), key.Shift(common_prefix.GetLength()), node_or_value);
                    return(node.Invalidate());
                }
                else
                {
                    TrieNode new_branch = new TrieNode(this);
                    TrieNode newKvNode  = new TrieNode(this, common_prefix, new_branch);

                    Insert(newKvNode, current_node_key, node.KVNodeGetValueOrNode());
                    Insert(newKvNode, key, node_or_value);
                    node.Dispose();
                    return(newKvNode);
                }
            }
        }
示例#3
0
        public TrieNode Delete(TrieNode node, TrieKey key)
        {
            TrieNode kv_node = null;

            if (node.NodeType == TrieNode.TrieNodeType.BranchNode)
            {
                if (key.IsEmpty)
                {
                    node.BranchNodeSetValue(null);
                }
                else
                {
                    int      index = key.GetHex(0);
                    TrieNode child = node.BranchNodeGetChild(index);
                    if (child == null)
                    {
                        return(node);
                    }

                    TrieNode new_node = Delete(child, key.Shift(1));
                    node.BranchNodeSetChild(index, new_node);
                    if (new_node != null)
                    {
                        return(node);
                    }
                }

                int compact_index = node.BranchNodeCompactIndex();
                if (compact_index < 0)
                {
                    return(node);
                }

                node.Dispose();
                if (compact_index == 16)
                {
                    return(new TrieNode(this, TrieKey.Empty(true), node.BranchNodeGetValue()));
                }
                else
                {
                    kv_node = new TrieNode(this, TrieKey.SingleHex(compact_index), node.BranchNodeGetChild(compact_index));
                }
            }
            else
            {
                TrieKey k = key.MatchAndShift(node.KVNodeGetKey());
                if (k == null)
                {
                    return(node);
                }
                else if (node.NodeType == TrieNode.TrieNodeType.KVNodeValue)
                {
                    if (k.IsEmpty)
                    {
                        node.Dispose();
                        return(null);
                    }
                    else
                    {
                        return(node);
                    }
                }
                else
                {
                    TrieNode child = Delete(node.KVNodeGetChildNode(), k);
                    if (child == null)
                    {
                        throw new System.Exception("Shouldn't happen");
                    }

                    kv_node = node.KVNodeSetValueOrNode(child);
                }
            }

            TrieNode new_child = kv_node.KVNodeGetChildNode();

            if (new_child.NodeType != TrieNode.TrieNodeType.BranchNode)
            {
                TrieKey  new_key  = kv_node.KVNodeGetKey().Concat(new_child.KVNodeGetKey());
                TrieNode new_node = new TrieNode(this, new_key, new_child.KVNodeGetValueOrNode());
                new_child.Dispose();
                kv_node.Dispose();

                return(new_node);
            }
            else
            {
                return(kv_node);
            }
        }