feat[indexes]: base implementation for 'inverted' index

Author: lucassouzavieira

src/Collection/Index/Factory.php

@@ -38,6 +38,7 @@ public static function factory(array $attributes): IndexInterface
             'geo' => GeoSpatialIndex::class,
             'skiplist' => SkipListIndex::class,
             'ttl' => TTLIndex::class,
+            'inverted' => InvertedIndex::class
         ];
 
         if (!array_key_exists($attributes['type'], $indexes)) {

src/Collection/Index/InvertedIndex.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace ArangoDB\Collection\Index;
+
+use ArangoDB\Validation\Exceptions\InvalidParameterException;
+
+/**
+* Inverted index representation
+*
+* @package ArangoDB\Collection\Index
+* @author Lucas S. Vieira
+*/
+class InvertedIndex extends Index
+{
+    /**
+     * InvertedIndex constructor
+     *
+     * @param array $fields Fields for which the index applies to
+     * @param array $attributes Index $attributes
+     *
+     * @throws InvalidParameterException
+     */
+    public function __construct(array $fields, array $attributes = [])
+    {
+        parent::__construct('inverted', $fields, $attributes);
+    }
+}

tests/Collection/Index/FactoryTest.php

@@ -2,6 +2,7 @@
 
 namespace Unit\Collection\GeneralIndex;
 
+use ArangoDB\Collection\Index\InvertedIndex;
 use Unit\TestCase;
 use ArangoDB\Collection\Index\Index;
 use ArangoDB\Collection\Index\Factory;
@@ -161,6 +162,21 @@ public function mockGenericArray(): array
         ];
     }
 
+    public function mockInvertedArray(): array
+    {
+        return [
+            'fields' => [
+                'my_field',
+            ],
+            'id' => 'coll/0',
+            'name' => 'inverted_idx',
+            'sparse' => true,
+            'unique' => false,
+            'type' => 'inverted',
+            'selectivityEstimate' => 0.015
+        ];
+    }
+
     public function testFactoryMakesPrimaryIndex()
     {
         $index = Factory::factory($this->mockPrimaryArray());
@@ -209,6 +225,12 @@ public function testFactoryMakesTTLIndex()
         $this->assertInstanceOf(TTLIndex::class, $index);
     }
 
+    public function testFactoryMakesInvertedIndex()
+    {
+        $index = Factory::factory($this->mockInvertedArray());
+        $this->assertInstanceOf(InvertedIndex::class, $index);
+    }
+
     public function testFactoryMakesGenericIndex()
     {
         $this->expectException(IndexException::class);