diff --git a/README.md b/README.md
index 101f5c5..19fb8d9 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
-# SAE (Services API Engine)
+# Contracts
 ![CircleCI (all branches)](https://img.shields.io/circleci/project/github/fmizzell/contracts.svg)
 [![Maintainability](https://api.codeclimate.com/v1/badges/3790fc0eeeb9dac4f0cb/maintainability)](https://codeclimate.com/github/fmizzell/contracts/maintainability)
 [![Test Coverage](https://api.codeclimate.com/v1/badges/3790fc0eeeb9dac4f0cb/test_coverage)](https://codeclimate.com/github/fmizzell/contracts/test_coverage)
 [![GPLv3 license](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0.en.html)
 
 
-A set of interfaces.
\ No newline at end of file
+A set of interfaces.
diff --git a/src/Conditioner.php b/src/Conditioner.php
new file mode 100644
index 0000000..97084cc
--- /dev/null
+++ b/src/Conditioner.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Contracts;
+
+
+interface Conditioner
+{
+  public function conditionByIsEqualTo(string $property, string $value);
+}
\ No newline at end of file
diff --git a/src/Limiter.php b/src/Limiter.php
new file mode 100644
index 0000000..673ddbd
--- /dev/null
+++ b/src/Limiter.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Contracts;
+
+interface Limiter
+{
+  public function limitTo(int $number_of_items);
+}
\ No newline at end of file
diff --git a/src/Mock/Storage/JsonObjectMemory.php b/src/Mock/Storage/JsonObjectMemory.php
new file mode 100644
index 0000000..1afa82a
--- /dev/null
+++ b/src/Mock/Storage/JsonObjectMemory.php
@@ -0,0 +1,127 @@
+<?php
+
+namespace Contracts\Mock\Storage;
+
+use Contracts\Sorter;
+use Contracts\Conditioner;
+use Contracts\Offsetter;
+use Contracts\Limiter;
+
+class JsonObjectMemory extends Memory implements Sorter, Conditioner, Offsetter, Limiter
+{
+  private $offset = 0;
+  private $limit = 0;
+
+  private $sorts = [
+    'ascend' => [],
+    'descend' => [],
+  ];
+
+  private $conditions = [];
+
+  public function retrieveAll(): array
+  {
+    $results = parent::retrieveAll();
+    $results = $this->applyFilters($results);
+    $this->resetFilters();
+    return  $results;
+  }
+
+  public function store(string $data, string $id = NULL): string
+  {
+    $this->validate($data);
+    return parent::store($data, $id);
+  }
+
+  public function conditionByIsEqualTo(string $property, string $value)
+  {
+    $this->conditions[$property][] = $value;
+  }
+
+  public function limitTo(int $number_of_items)
+  {
+    $this->limit = $number_of_items;
+  }
+
+  public function offsetBy(int $offset)
+  {
+    $this->offset = $offset;
+  }
+
+  public function sortByAscending(string $property)
+  {
+    $this->sorts['ascend'][] = $property;
+  }
+
+  public function sortByDescending(string $property)
+  {
+    $this->sorts['descend'][] = $property;
+  }
+
+  private function applyFilters(array $results) {
+
+    if (!empty($this->conditions)) {
+      $results2 = [];
+
+      foreach ($this->conditions as $property => $values) {
+        foreach ($values as $value) {
+          foreach ($results as $key => $result) {
+            $obj = json_decode($result);
+            if ($obj->{$property} == $value) {
+              $results2[$key] = $result;
+            }
+          }
+        }
+      }
+
+      $results = $results2;
+    }
+
+
+    foreach ($this->sorts as $type => $properties) {
+      foreach ($properties as $property) {
+        usort($results, function ($a, $b) use ($property) {
+          return $this->compare($a, $b, $property);
+        });
+
+        if ($type == 'descend') {
+          $results = array_reverse($results);
+        }
+      }
+    }
+
+    if ($this->limit > 0 || $this->offset > 0) {
+      $results = array_slice($results, $this->offset, $this->limit);
+    }
+
+    return $results;
+  }
+
+  private function resetFilters() {
+    $this->offset = 0;
+    $this->limit = 0;
+
+    $this->sorts = [
+      'ascend' => [],
+      'descend' => [],
+    ];
+
+    $this->conditions = [];
+  }
+
+  private function validate(string $data) {
+    $decoded = json_decode($data);
+    if (is_null($decoded)) {
+      throw new \Exception("Only JSON strings can be stored");
+    }
+    if (!is_object($decoded)) {
+      throw new \Exception("Only strings with JSON objects can be stored");
+    }
+  }
+
+  private function compare($a, $b, $property) {
+    $a = json_decode($a);
+    $b = json_decode($b);
+    return strnatcmp($a->{$property}, $b->{$property});
+  }
+}
\ No newline at end of file
diff --git a/src/Mock/Storage/Memory.php b/src/Mock/Storage/Memory.php
index 17ec839..3af56f9 100644
--- a/src/Mock/Storage/Memory.php
+++ b/src/Mock/Storage/Memory.php
@@ -2,7 +2,11 @@
 
 namespace Contracts\Mock\Storage;
 
-class Memory implements \Contracts\Storage, \Contracts\BulkRetriever {
+use Contracts\Storage;
+use Contracts\BulkRetriever;
+
+class Memory implements Storage, BulkRetriever {
+
   private $storage = [];
 
   public function retrieve(string $id): ?string
@@ -20,7 +24,7 @@ public function retrieveAll(): array
 
   public function store(string $data, string $id = NULL): string
   {
-    if (!$id) {
+    if (!isset($id)) {
       throw new \Exception("An id is required to store the data.");
     }
     if (!isset($this->storage[$id])) {
@@ -39,4 +43,5 @@ public function remove(string $id)
     }
     return FALSE;
   }
+
 }
\ No newline at end of file
diff --git a/src/Offsetter.php b/src/Offsetter.php
new file mode 100644
index 0000000..fcc44c0
--- /dev/null
+++ b/src/Offsetter.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Contracts;
+
+interface Offsetter
+{
+  public function offsetBy(int $offset);
+}
\ No newline at end of file
diff --git a/src/Sorter.php b/src/Sorter.php
new file mode 100644
index 0000000..d09f364
--- /dev/null
+++ b/src/Sorter.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Contracts;
+
+interface Sorter
+{
+  public function sortByAscending(string $property);
+  public function sortByDescending(string $property);
+}
\ No newline at end of file
diff --git a/tests/MockTest.php b/tests/MockTest.php
index 2abc8dc..99c0619 100644
--- a/tests/MockTest.php
+++ b/tests/MockTest.php
@@ -29,4 +29,90 @@ public function testStorageMemory() {
     $this->assertNull($store->retrieve("1"));
   }
 
+  public function testStorageJsonObjectMemory() {
+    $objects = [];
+    $objects[] = <<<JSON
+{
+  "first": "Gerardo",
+  "last": "Gonzalez"
+}
+JSON;
+
+    $objects[] = <<<JSON
+{
+  "first": "Pedro",
+  "last": "Gonzalez"
+}
+JSON;
+
+    $objects[] = <<<JSON
+{
+  "first": "Gerardo",
+  "last": "Lopez"
+}
+JSON;
+
+    $objects[] = <<<JSON
+{
+  "first": "Jhonny",
+  "last": "Five"
+}
+JSON;
+
+    $store = new \Contracts\Mock\Storage\JsonObjectMemory();
+
+
+    foreach ($objects as $index => $object) {
+      $store->store($object, "{$index}");
+    }
+
+    $this->assertEquals(4, count($store->retrieveAll()));
+
+    $store->offsetBy(1);
+    $store->limitTo(1);
+
+    foreach ($store->retrieveAll() as $string) {
+      $this->assertEquals($objects[1], $string);
+    }
+
+    $store->offsetBy(3);
+
+    foreach ($store->retrieveAll() as $string) {
+      $this->assertEquals($objects[3], $string);
+    }
+
+    $store->limitTo(1);
+
+    foreach ($store->retrieveAll() as $string) {
+      $this->assertEquals($objects[0], $string);
+    }
+
+    $store->sortByAscending("first");
+
+    $order = [0, 2, 3, 1];
+    $order_index = 0;
+    foreach ($store->retrieveAll() as $string) {
+      $this->assertEquals($objects[$order[$order_index]], $string);
+      $order_index++;
+    }
+
+    $store->sortByDescending("first");
+
+    $order = [1, 3, 2, 0];
+    $order_index = 0;
+    foreach ($store->retrieveAll() as $string) {
+      $this->assertEquals($objects[$order[$order_index]], $string);
+      $order_index++;
+    }
+
+    $store->conditionByIsEqualTo("first", "Gerardo");
+
+    $order = [0, 2];
+    $order_index = 0;
+    foreach ($store->retrieveAll() as $string) {
+      $this->assertEquals($objects[$order[$order_index]], $string);
+      $order_index++;
+    }
+  }
+
 }
\ No newline at end of file