doc: Remove DocTree class

It will be replaced by a class in our lib

refs #6630

modules/doc/library/Doc/DocTree.php

@@ -1,79 +0,0 @@
-<?php
-/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
-
-namespace Icinga\Module\Doc;
-
-use LogicException;
-use Icinga\Data\Identifiable;
-use Icinga\Data\Tree\Node;
-
-/**
- * Documentation tree
- */
-class DocTree extends Node
-{
-    /**
-     * All nodes of the tree
-     *
-     * @var array
-     */
-    protected $nodes = array();
-
-    /**
-     * Append a root node to the tree
-     *
-     * @param Identifiable $root
-     */
-    public function addRoot(Identifiable $root)
-    {
-        $rootId = $root->getId();
-        if (isset($this->nodes[$rootId])) {
-            $rootId = uniqid($rootId);
-//            throw new LogicException(
-//                sprintf('Can\'t add root node: a root node with the id \'%s\' already exists', $rootId)
-//            );
-        }
-        $this->nodes[$rootId] = $this->appendChild($root);
-    }
-
-    /**
-     * Append a child node to a parent node
-     *
-     * @param   Identifiable $child
-     * @param   Identifiable $parent
-     *
-     * @throws  LogicException If the the tree does not contain the parent node
-     */
-    public function addChild(Identifiable $child, Identifiable $parent)
-    {
-        $childId = $child->getId();
-        $parentId = $parent->getId();
-        if (isset($this->nodes[$childId])) {
-            $childId = uniqid($childId);
-//            throw new LogicException(
-//                sprintf('Can\'t add child node: a child node with the id \'%s\' already exists', $childId)
-//            );
-        }
-        if (! isset($this->nodes[$parentId])) {
-            throw new LogicException(
-                sprintf(mt('doc', 'Can\'t add child node: there\'s no parent node having the id \'%s\''), $parentId)
-            );
-        }
-        $this->nodes[$childId] = $this->nodes[$parentId]->appendChild($child);
-    }
-
-    /**
-     * Get a node
-     *
-     * @param   mixed $id
-     *
-     * @return  Node|null
-     */
-    public function getNode($id)
-    {
-        if (! isset($this->nodes[$id])) {
-            return null;
-        }
-        return $this->nodes[$id];
-    }
-}