exception when no comparision returns true

Author: doganoo

src/Common/Exception/InvalidSearchComparisionException.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * MIT License
+ *
+ * Copyright (c) 2018 Dogan Ucar
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+namespace doganoo\PHPAlgorithms\Common\Exception;
+
+/**
+ * Class InvalidSearchOperationException
+ *
+ * @package doganoo\PHPAlgorithms\Common\Exception
+ */
+class InvalidSearchComparisionException extends \Exception {
+
+}

src/Datastructure/Graph/Tree/BinarySearchTree.php

@@ -26,6 +26,7 @@
 namespace doganoo\PHPAlgorithms\Datastructure\Graph\Tree;
 
 
+use doganoo\PHPAlgorithms\Common\Exception\InvalidSearchComparisionException;
 use doganoo\PHPAlgorithms\Common\Interfaces\IBinaryNode;
 use doganoo\PHPAlgorithms\Common\Interfaces\IBinaryTree;
 use doganoo\PHPAlgorithms\Common\Util\Comparator;
@@ -188,6 +189,7 @@ private function _height(?IBinaryNode $node): int {
      *
      * @param $value
      * @return BinarySearchNode|null
+     * @throws InvalidSearchComparisionException
      */
     public function search($value): ?BinarySearchNode {
         /** @var BinarySearchNode $node */
@@ -199,6 +201,8 @@ public function search($value): ?BinarySearchNode {
                 $node = $node->getLeft();
             } else if (Comparator::greaterThan($value, $node->getValue())) {
                 $node = $node->getRight();
+            } else {
+                throw new InvalidSearchComparisionException("no comparision returned true. Maybe you passed different data types (scalar, object)?");
             }
         }
         return null;