Initial commit of Guid.cls & Guid_Tests.cls

Author: jongpie

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Jonathan Gillespie
+
+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.
+

src/classes/Guid.cls

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+public without sharing class Guid {
+    public static String createGuid() {
+        Blob generatedBlob = Crypto.GenerateAESKey(128);
+        String hex = EncodingUtil.ConvertTohex(generatedBlob);
+        String guid = hex.substring(0, 8)
+            + '-' + hex.substring(8, 12)
+            + '-' + hex.substring(12, 16)
+            + '-' + hex.substring(16, 20)
+            + '-' + hex.substring(20);
+
+        return guid.toUpperCase();
+    }
+
+    public static boolean isEmpty(String guid) {
+        return String.isBlank(guid) || guid == '00000000-0000-0000-0000-000000000000';
+    }
+
+    public static Boolean isGuid(String guid) {
+        if(String.isBlank(guid)) return false;
+
+        String guidRegEx = '[A-F0-9]{8}(?:-[A-F0-9]{4}){3}-[A-F0-9]{12}';
+        Pattern guidPattern = Pattern.compile(guidRegEx);
+        Matcher guidMatcher = guidPattern.matcher(guid.toUpperCase());
+        Boolean result = guidMatcher.matches();
+        return result;
+    }
+}

src/classes/Guid.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>38.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

src/classes/Guid_Tests.cls

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+@isTest
+private class Guid_Tests {
+
+    @isTest
+    static void it_should_consider_all_zeroes_string_to_be_empty() {
+        System.assert(Guid.isEmpty('00000000-0000-0000-0000-000000000000'));
+    }
+
+    @isTest
+    static void it_should_create_a_new_guid() {
+        String generatedGuid = Guid.createGuid();
+        System.assertEquals(36, generatedGuid.length());
+    }
+
+    @isTest
+    static void it_should_verify_that_a_guid_is_a_guid() {
+        String generatedGuid = Guid.createGuid();
+        System.assert(Guid.isGuid(generatedGuid));
+    }
+
+    @isTest
+    static void it_should_consider_null_string_an_empty_guid() {
+        System.assert(Guid.isEmpty(null));
+    }
+
+    @isTest
+    static void it_should_not_consider_an_empty_string_a_guid() {
+        System.assertEquals(false, Guid.isGuid(''));
+    }
+
+    @isTest
+    static void it_should_not_consider_null_a_guid() {
+        System.assertEquals(false, Guid.isGuid(null));
+    }
+
+    @isTest
+    static void it_should_validate_a_guid_in_upper_case() {
+        String exampleGuid = 'f3665813-1a60-4924-ad9b-23a9cef17d80'.toUpperCase();
+        System.assertEquals(true, Guid.isGuid(exampleGuid));
+    }
+
+    @isTest
+    static void it_should_validate_a_guid_in_lower_case() {
+        String exampleGuid = 'f3665813-1a60-4924-ad9b-23a9cef17d80'.toLowerCase();
+        System.assertEquals(true, Guid.isGuid(exampleGuid));
+    }
+}

src/classes/Guid_Tests.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>38.0</apiVersion>
+    <status>Active</status>
+</ApexClass>