Added AlreadyExistsExceptions for filesystem along with related excep… (#5)

* Added AlreadyExistsExceptions for filesystem along with related exception tag

* Formatting fix

Author: crazycodr

Exceptions/IO/Filesystem/DirectoryAlreadyExistsException.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Exceptions\IO\Filesystem;
+
+use Exceptions\Tag\AlreadyExistsException;
+
+/**
+ * Use this exception when your code tries to create a local directory but it already exists.
+ *
+ * @author   Mathieu Dumoulin aka CrazyCodr <[email protected]>
+ * @license  MIT
+ */
+class DirectoryAlreadyExistsException extends FilesystemException implements AlreadyExistsException
+{
+    public function __construct(
+        $message = 'Cannot find specified directory',
+        $code = 0,
+        $previous = null
+    ) {
+        parent::__construct($message, $code, $previous);
+    }
+}

Exceptions/IO/Filesystem/FileAlreadyExistsException.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Exceptions\IO\Filesystem;
+
+use Exceptions\Tag\AlreadyExistsException;
+
+/**
+ * Use this exception when your code tries to create a file but it already exists.
+ *
+ * @author   Mathieu Dumoulin aka CrazyCodr <[email protected]>
+ * @license  MIT
+ */
+class FileAlreadyExistsException extends FilesystemException implements AlreadyExistsException
+{
+    public function __construct(
+        $message = 'Cannot find specified file',
+        $code = 0,
+        $previous = null
+    ) {
+        parent::__construct($message, $code, $previous);
+    }
+}

Exceptions/Tag/AlreadyExistsException.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Exceptions\Tag;
+
+/**
+ * This is a tag interface that is used to conveys a shared means throughout many different exceptions in many
+ * different namespaces. If you want to catch a potential error about something that already exists, you would try to
+ * catch any exception that implements this interface.
+ *
+ * @author   Mathieu Dumoulin aka CrazyCodr <[email protected]>
+ * @license  MIT
+ */
+interface AlreadyExistsException
+{
+}

Tests/ExceptionTest.php

@@ -34,10 +34,12 @@ public function providesConstructorTestClasses()
             [\Exceptions\Http\Server\NotImplementedException::class],
             [\Exceptions\Http\Server\ServiceUnavailableException::class],
             [\Exceptions\IO\Filesystem\FileNotWritableException::class],
+            [\Exceptions\IO\Filesystem\FileAlreadyExistsException::class],
             [\Exceptions\IO\Filesystem\NotAFileException::class],
             [\Exceptions\IO\Filesystem\NotADirectoryException::class],
             [\Exceptions\IO\Filesystem\FileNotFoundException::class],
             [\Exceptions\IO\Filesystem\DirectoryNotWritableException::class],
+            [\Exceptions\IO\Filesystem\DirectoryAlreadyExistsException::class],
             [\Exceptions\IO\Filesystem\DirectoryNotFoundException::class],
             [\Exceptions\IO\Filesystem\FileNotReadableException::class],
             [\Exceptions\IO\Filesystem\DirectoryNotReadableException::class],