Add Condition helper class for more readable code

README.md

@@ -477,6 +477,60 @@ $cmdbObjects
     ->purge([1, 2, 3]);
 ~~~
 
+#### Read object by condition
+
+Allowed comparison are '=', '!=', 'like', 'not like', '>', '>=', '<', '<=', '<>'.
+
+~~~ {.php}
+use Idoit\APIClient\API;
+use Idoit\APIClient\CMDBCondition;
+
+$api = new API([/* … */]);
+$condition = new CMDBCondition($api);
+$result = $condition->read(
+    [
+        [
+            'property' => "C__CATG__ACCOUNTING-order_no",
+            'comparison' => "=",
+            'value' => "ORDER4711",
+        ]
+    ]
+);
+~~~
+
+You can use more than one condition and add an operator to them.
+Allowed operators are 'AND' and 'OR'.
+
+~~~ {.php}
+$result = $condition->read(
+    [
+        [
+            'property' => "C__CATG__ACCOUNTING-order_no",
+            'comparison' => "=",
+            'value' => "ORDER4711",
+        ],
+        [
+            'property' => "C__CATG__ACCOUNTING-order_no",
+            'comparison' => "=",
+            'value' => "ORDER0815",
+            'operator' => 'OR',
+        ]
+    ]
+);
+~~~
+
+For more readable code you can use the condition helper class.
+
+~~~ {.php}
+use Idoit\APIClient\Condition;
+
+$conditions = [
+    new Condition("C__CATG__ACCOUNTING", "order_no", "=", "ORDER4711"),
+    new Condition("C__CATG__ACCOUNTING", "order_no", "=", "ORDER4711", Condition::OR),
+];
+$result = $condition->read($conditions);
+~~~
+
 #### Create category entries with attributes
 
 ~~~ {.php}

src/Condition.php

@@ -0,0 +1,174 @@
+<?php
+
+/**
+ * Copyright (C) 2022 synetics GmbH
+ * Copyright (C) 2016-2022 Benjamin Heisig
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @copyright Copyright (C) 2022 synetics GmbH
+ * @copyright Copyright (C) 2016-2022 Benjamin Heisig
+ * @license   http://www.gnu.org/licenses/agpl-3.0 GNU Affero General Public License (AGPL)
+ * @link      https://github.com/i-doit/api-client-php
+ */
+
+declare(strict_types=1);
+
+namespace Idoit\APIClient;
+
+use \Exception;
+
+/**
+ * Conditional helper for more readable code
+ */
+class Condition
+{
+
+    /**
+     * Operator: AND
+     */
+    const AND = 'AND';
+
+    /**
+     * Operator: URL
+     */
+    const OR = 'OR';
+
+    public string $property;
+
+    public string $comparison;
+
+    public string $value;
+
+    public string $operator;
+
+    public function where(string $const, string $property):self
+    {
+        $this->property = $const . "-" . $property;
+        return $this;
+    }
+
+    public function andWhere(string $const, string $property):self
+    {
+        $this->operator = self::AND;
+        $this->where($const, $property);
+        return $this;
+    }
+
+    public function orWhere(string $const, string $property):self
+    {
+        $this->operator = self::OR;
+        $this->where($const, $property);
+        return $this;
+    }
+
+    public function isLike(string $value):self
+    {
+        $this->comparison = 'like';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isNotLike(string $value):self
+    {
+        $this->comparison = 'not like';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isEqualTo(string $value):self
+    {
+        $this->comparison = '=';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isNotEqualTo(string $value):self
+    {
+        $this->comparison = '!=';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isGreaterThan(string $value):self
+    {
+        $this->comparison = '>';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isGreaterOrEqaulThan(string $value):self
+    {
+        $this->comparison = '>=';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isLowerThan(string $value):self
+    {
+        $this->comparison = '<';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isLowerOrEaqualThan(string $value):self
+    {
+        $this->comparison = '<=';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function isLowerOrGreaterThan(string $value):self
+    {
+        $this->comparison = '<>';
+        $this->value = $value;
+        return $this;
+    }
+
+    public function __construct($const = null, $property = null, $comparison = null, $value = null, $operator = null)
+    {
+
+        if (!is_null($const) && !is_null($property)) {
+            $this->property = $const . "-" . $property;
+        }
+
+        $allowedComparison = ['=', '!=', 'like', 'not like', '>', '>=', '<', '<=', '<>'];
+        if (!is_null($comparison) && !is_null($value) && in_array($comparison, $allowedComparison)) {
+            $this->comparison = $comparison;
+            $this->value = $value;
+        }
+
+        $allowedOperators = [self::AND, self::OR];
+        if (!is_null($operator) && in_array(strtoupper($operator), $allowedOperators)) {
+             $this->operator = strtoupper($operator);
+        }
+    }
+
+    public function toArray(): array
+    {
+
+        $condition = [
+            'property' => $this->property,
+            'comparison' => $this->comparison,
+            'value' => $this->value
+        ];
+
+        if (isset($this->operator)) {
+            $condition['operator'] = $this->operator;
+        }
+
+        return $condition;
+    }
+
+}