#1650 cannot find symbol nested mapping mappingtarget (#1671)

* #1650 reproducer

* #1650 fix cannot-find-symbol

* #1650 reproducer, extended

processor/src/main/resources/org/mapstruct/ap/internal/model/assignment/UpdateWrapper.ftl

@@ -9,7 +9,8 @@
 <#import '../macro/CommonMacros.ftl' as lib >
 <@lib.handleExceptions>
   <#if includeSourceNullCheck>
-    if ( <#if sourcePresenceCheckerReference?? >${sourcePresenceCheckerReference}<#else>${sourceReference} != null</#if> ) {
+    <@lib.sourceLocalVarAssignment/>
+    if ( <#if sourcePresenceCheckerReference?? >${sourcePresenceCheckerReference}<#else><#if sourceLocalVarName??>${sourceLocalVarName}<#else>${sourceReference}</#if> != null</#if> ) {
       <@assignToExistingTarget/>
       <@lib.handleAssignment/>;
     }

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/A.java

@@ -0,0 +1,18 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+public class A {
+    private B b;
+
+    public B getB() {
+        return b;
+    }
+
+    public void setB(B b) {
+        this.b = b;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/AMapper.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.MappingTarget;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface AMapper {
+
+    AMapper INSTANCE = Mappers.getMapper( AMapper.class );
+
+    @Mapping(source = "b.c", target = "cPrime")
+    APrime toAPrime(A a, @MappingTarget APrime mappingTarget);
+
+    CPrime toCPrime(C c, @MappingTarget CPrime mappingTarget);
+
+    @Mapping(source = "b.c", target = "cPrime")
+    APrime toAPrime(A a);
+
+    CPrime toCPrime(C c);
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/APrime.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+public class APrime {
+
+    private CPrime cPrime;
+
+    public CPrime getcPrime() {
+        return cPrime;
+    }
+
+    public void setcPrime(CPrime cPrime) {
+        this.cPrime = cPrime;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/B.java

@@ -0,0 +1,18 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+public class B {
+    private C c;
+
+    public C getC() {
+        return c;
+    }
+
+    public void setC(C c) {
+        this.c = c;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/C.java

@@ -0,0 +1,9 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+public class C {
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/CPrime.java

@@ -0,0 +1,9 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+public class CPrime {
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_1650/Issue1650Test.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._1650;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.runner.AnnotationProcessorTestRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@IssueKey("1650")
+@RunWith(AnnotationProcessorTestRunner.class)
+@WithClasses({
+    AMapper.class,
+    A.class,
+    B.class,
+    C.class,
+    APrime.class,
+    CPrime.class
+})
+public class Issue1650Test {
+
+    @Test
+    public void shouldCompile() {
+
+       A a = new A();
+       a.setB( new B() );
+       a.getB().setC( new C() );
+
+       APrime aPrime = new APrime();
+
+       // update mapping
+       AMapper.INSTANCE.toAPrime( a, aPrime );
+       assertThat( aPrime.getcPrime() ).isNotNull();
+
+       // create mapping
+        APrime aPrime1 = AMapper.INSTANCE.toAPrime( a );
+        assertThat( aPrime1.getcPrime() ).isNotNull();
+    }
+}