Move RecordTransform functionality to CopyFields to make purpose more…

… explicit

README.md

@@ -288,15 +288,15 @@ List<Opportunity> opps = new List<Opportunity>{
 Collection.of(opps).mapAll(new DoubleAmount()); // amounts have been doubled
 ```
 
-One `SObjectToSObjectFunction` is provided out of the box, `RecordTransform`. It is instantiated through a factory method on `Transform`:
+One `SObjectToSObjectFunction` is provided out of the box, `CopyFields`. It is instantiated through a factory method, `CopyFields.fromRecord`.
 
-#### `RecordTransform`
+#### `CopyFields`
 
-`RecordTransform` copies all defined fields from `prototype` record to the record it is applied to. Values of fields defined for `prototype` are overwritten on
+`CopyFields` copies all defined fields from `prototype` record to the record it is applied to. Values of fields defined for `prototype` are overwritten on
 target records. Other fields on target record are not modified.
 
 ```apex
-Collection.of(opps).mapAll(Transform.record(new Opportunity(Name = 'Test'))); // Name field has been overwritten with 'Test'
+Collection.of(opps).mapAll(CopyFields.fromRecord(new Opportunity(Name = 'Test'))); // Name field has been overwritten with 'Test'
 ```
 
 ### `mapSome`

src/classes/CollectionTest.cls

@@ -601,11 +601,11 @@ public class CollectionTest {
 	}
 
 	@IsTest
-	static void testMapWithTransform() {
+	static void testMapWithCopyFields() {
 		List<Opportunity> opportunities = Collection.of(new List<Opportunity>{
 			new Opportunity(Amount = 100),
 			new Opportunity(Amount = 150)
-		}).mapAll(Transform.record(new Opportunity(Amount = 123))).asList();
+		}).mapAll(CopyFields.fromRecord(new Opportunity(Amount = 123))).asList();
 		System.assertEquals(123, opportunities[0].Amount);
 		System.assertEquals(123, opportunities[1].Amount);
 	}

src/classes/RecordTransform.cls → src/classes/CopyFields.cls

@@ -1,16 +1,20 @@
-public class RecordTransform implements SObjectToSObjectFunction {
+public class CopyFields implements SObjectToSObjectFunction {
+
 	private SObject prototype;
 	private Map<String, Object> populatedFieldsMap;
 
-	public SObject apply(SObject record) {
+	public static CopyFields fromRecord(SObject record) {
+		return new CopyFields(record);
+	}
 
+	public SObject apply(SObject record) {
 		for (String field : populatedFieldsMap.keySet()) {
 			record.put(field, prototype.get(field));
 		}
 		return record;
 	}
 
-	public RecordTransform(sObject prototype) {
+	private CopyFields(sObject prototype) {
 		this.prototype = prototype;
 		this.populatedFieldsMap = prototype.getPopulatedFieldsAsMap();
 	}

src/classes/Transform.cls-meta.xml → src/classes/CopyFields.cls-meta.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
-    <apiVersion>44.0</apiVersion>
+    <apiVersion>45.0</apiVersion>
     <status>Active</status>
 </ApexClass>

src/classes/RecordTransformTest.cls → src/classes/CopyFieldsTest.cls

@@ -1,19 +1,19 @@
 @IsTest
-public class RecordTransformTest {
+public class CopyFieldsTest {
 	@IsTest
 	public static void definedFieldsAreUsed() {
 		Opportunity opp = new Opportunity();
-		RecordTransform t = Transform.record(new Opportunity(Amount = 1000, Name = 'Test'));
-		t.apply(opp);
+		CopyFields c = CopyFields.fromRecord(new Opportunity(Amount = 1000, Name = 'Test'));
+		c.apply(opp);
 		System.assertEquals(1000, opp.Amount);
 		System.assertEquals('Test', opp.Name);
 	}
 
 	@IsTest
 	public static void fieldsAreOverwritten() {
 		Opportunity opp = new Opportunity(Amount = 1000);
-		RecordTransform t = Transform.record(new Opportunity(Amount = 2000));
-		t.apply(opp);
+		CopyFields c = CopyFields.fromRecord(new Opportunity(Amount = 2000));
+		c.apply(opp);
 		System.assertEquals(2000, opp.Amount);
 	}
 }

src/classes/RecordTransform.cls-meta.xml → src/classes/CopyFieldsTest.cls-meta.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
-    <apiVersion>44.0</apiVersion>
+    <apiVersion>45.0</apiVersion>
     <status>Active</status>
 </ApexClass>