#3186 Do not use conversions in 2-step mapping when they are disabled

processor/src/main/java/org/mapstruct/ap/internal/processor/creation/MappingResolverImpl.java

@@ -295,22 +295,26 @@ public class MappingResolverImpl implements MappingResolver {
                 }
 
                 // 2 step method, then: method(conversion(source))
+                if ( allowConversion() ) {
                     assignment = ConversionMethod.getBestMatch( this, sourceType, targetType );
                     if ( assignment != null ) {
                         usedSupportedMappings.addAll( supportingMethodCandidates );
                         return assignment;
                     }
+                }
 
                 // stop here when looking for update methods.
                 selectionCriteria.setPreferUpdateMapping( false );
 
                 // 2 step method, finally: conversion(method(source))
+                if ( allowConversion() ) {
                     assignment = MethodConversion.getBestMatch( this, sourceType, targetType );
                     if ( assignment != null ) {
                         usedSupportedMappings.addAll( supportingMethodCandidates );
                         return assignment;
                     }
                 }
+            }
 
             if ( hasQualfiers() ) {
                 if ((sourceType.isCollectionType() || sourceType.isArrayType()) && targetType.isIterableType()) {
@@ -763,6 +767,7 @@ public class MappingResolverImpl implements MappingResolver {
                     return mmAttempt.result;
                 }
             }
+            if ( att.allowConversion() ) {
                 MethodMethod<Method, BuiltInMethod> mbAttempt =
                     new MethodMethod<>( att, att.methods, att.builtIns, att::toMethodRef, att::toBuildInRef )
                         .getBestMatch( sourceType, targetType );
@@ -781,6 +786,9 @@ public class MappingResolverImpl implements MappingResolver {
                 return bbAttempt.result;
             }
 
+            return null;
+        }
+
         MethodMethod(ResolvingAttempt attempt, List<T1> xMethods, List<T2> yMethods,
                             Function<SelectedMethod<T1>, Assignment> xCreate,
                             Function<SelectedMethod<T2>, Assignment> yCreate) {

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/ErroneousBuiltInAndBuiltInMapper.java

@@ -0,0 +1,44 @@
+/*
+ * 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.mappingcontrol;
+
+import java.time.ZonedDateTime;
+import java.util.Date;
+
+import org.mapstruct.Mapper;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper(mappingControl = NoConversion.class)
+public interface ErroneousBuiltInAndBuiltInMapper {
+
+    Target map(Source source);
+
+    class Source {
+        private final ZonedDateTime time;
+
+        public Source(ZonedDateTime time) {
+            this.time = time;
+        }
+
+        public ZonedDateTime getTime() {
+            return time;
+        }
+    }
+
+    class Target {
+        private final Date time;
+
+        public Target(Date time) {
+            this.time = time;
+        }
+
+        public Date getTime() {
+            return time;
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/ErroneousBuiltInAndMethodMapper.java

@@ -0,0 +1,50 @@
+/*
+ * 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.mappingcontrol;
+
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.ZonedDateTime;
+import java.util.Calendar;
+
+import org.mapstruct.Mapper;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper(mappingControl = NoConversion.class)
+public interface ErroneousBuiltInAndMethodMapper {
+
+    Target map(Source source);
+
+    default ZonedDateTime fromInt(int time) {
+        return ZonedDateTime.ofInstant( Instant.ofEpochMilli( time ), ZoneOffset.UTC );
+    }
+
+    class Source {
+        private final int time;
+
+        public Source(int time) {
+            this.time = time;
+        }
+
+        public int getTime() {
+            return time;
+        }
+    }
+
+    class Target {
+        private Calendar time;
+
+        public Target(Calendar time) {
+            this.time = time;
+        }
+
+        public Calendar getTime() {
+            return time;
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/ErroneousConversionAndMethodMapper.java

@@ -0,0 +1,48 @@
+/*
+ * 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.mappingcontrol;
+
+import java.time.Instant;
+import java.util.Date;
+
+import org.mapstruct.Mapper;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper(mappingControl = NoConversion.class)
+public interface ErroneousConversionAndMethodMapper {
+
+    Target map(Source source);
+
+    default Instant fromDate(int time) {
+        return Instant.ofEpochMilli( time );
+    }
+
+    class Source {
+        private final int time;
+
+        public Source(int time) {
+            this.time = time;
+        }
+
+        public int getTime() {
+            return time;
+        }
+    }
+
+    class Target {
+        private Date time;
+
+        public Target(Date time) {
+            this.time = time;
+        }
+
+        public Date getTime() {
+            return time;
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/ErroneousMethodAndBuiltInMapper.java

@@ -0,0 +1,49 @@
+/*
+ * 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.mappingcontrol;
+
+import java.time.ZonedDateTime;
+import java.util.Calendar;
+import java.util.Date;
+
+import org.mapstruct.Mapper;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper(mappingControl = NoConversion.class)
+public interface ErroneousMethodAndBuiltInMapper {
+
+    Target map(Source source);
+
+    default Date fromCalendar(Calendar calendar) {
+        return calendar != null ? calendar.getTime() : null;
+    }
+
+    class Source {
+        private final ZonedDateTime time;
+
+        public Source(ZonedDateTime time) {
+            this.time = time;
+        }
+
+        public ZonedDateTime getTime() {
+            return time;
+        }
+    }
+
+    class Target {
+        private final Date time;
+
+        public Target(Date time) {
+            this.time = time;
+        }
+
+        public Date getTime() {
+            return time;
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/ErroneousMethodAndConversionMapper.java

@@ -0,0 +1,48 @@
+/*
+ * 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.mappingcontrol;
+
+import java.time.Instant;
+import java.util.Date;
+
+import org.mapstruct.Mapper;
+
+/**
+ * @author Filip Hrisafov
+ */
+@Mapper(mappingControl = NoConversion.class)
+public interface ErroneousMethodAndConversionMapper {
+
+    Target map(Source source);
+
+    default long fromInstant(Instant value) {
+        return value != null ? value.getEpochSecond() : null;
+    }
+
+    class Source {
+        private final Date time;
+
+        public Source(Date time) {
+            this.time = time;
+        }
+
+        public Date getTime() {
+            return time;
+        }
+    }
+
+    class Target {
+        private long time;
+
+        public Target(long time) {
+            this.time = time;
+        }
+
+        public long getTime() {
+            return time;
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/MappingControlTest.java

@@ -240,6 +240,96 @@ public class MappingControlTest {
     public void complexSelectionNotAllowedWithConfig() {
     }
 
+    @ProcessorTest
+    @IssueKey("3186")
+    @WithClasses({
+        ErroneousMethodAndBuiltInMapper.class,
+        NoConversion.class
+    })
+    @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
+        diagnostics = {
+            @Diagnostic(type = ErroneousMethodAndBuiltInMapper.class,
+                kind = javax.tools.Diagnostic.Kind.ERROR,
+                line = 20,
+                message = "Can't map property \"ZonedDateTime time\" to \"Date time\". " +
+                    "Consider to declare/implement a mapping method: \"Date map(ZonedDateTime value)\"."
+            )
+        })
+    public void conversionSelectionNotAllowedInTwoStepMethodBuiltIdConversion() {
+    }
+
+    @ProcessorTest
+    @IssueKey("3186")
+    @WithClasses({
+        ErroneousBuiltInAndBuiltInMapper.class,
+        NoConversion.class
+    })
+    @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
+        diagnostics = {
+            @Diagnostic(type = ErroneousBuiltInAndBuiltInMapper.class,
+                kind = javax.tools.Diagnostic.Kind.ERROR,
+                line = 19,
+                message = "Can't map property \"ZonedDateTime time\" to \"Date time\". " +
+                    "Consider to declare/implement a mapping method: \"Date map(ZonedDateTime value)\"."
+            )
+        })
+    public void conversionSelectionNotAllowedInTwoStepBuiltInBuiltInConversion() {
+    }
+
+    @ProcessorTest
+    @IssueKey("3186")
+    @WithClasses({
+        ErroneousBuiltInAndMethodMapper.class,
+        NoConversion.class
+    })
+    @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
+        diagnostics = {
+            @Diagnostic(type = ErroneousBuiltInAndMethodMapper.class,
+                kind = javax.tools.Diagnostic.Kind.ERROR,
+                line = 21,
+                message = "Can't map property \"int time\" to \"Calendar time\". " +
+                    "Consider to declare/implement a mapping method: \"Calendar map(int value)\"."
+            )
+        })
+    public void conversionSelectionNotAllowedInTwoStepBuiltInMethodConversion() {
+    }
+
+    @ProcessorTest
+    @IssueKey("3186")
+    @WithClasses({
+        ErroneousMethodAndConversionMapper.class,
+        NoConversion.class
+    })
+    @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
+        diagnostics = {
+            @Diagnostic(type = ErroneousMethodAndConversionMapper.class,
+                kind = javax.tools.Diagnostic.Kind.ERROR,
+                line = 19,
+                message = "Can't map property \"Date time\" to \"long time\". " +
+                    "Consider to declare/implement a mapping method: \"long map(Date value)\"."
+            )
+        })
+    public void conversionSelectionNotAllowedInTwoStepMethodConversionConversion() {
+    }
+
+    @ProcessorTest
+    @IssueKey("3186")
+    @WithClasses({
+        ErroneousConversionAndMethodMapper.class,
+        NoConversion.class
+    })
+    @ExpectedCompilationOutcome(value = CompilationResult.FAILED,
+        diagnostics = {
+            @Diagnostic(type = ErroneousConversionAndMethodMapper.class,
+                kind = javax.tools.Diagnostic.Kind.ERROR,
+                line = 19,
+                message = "Can't map property \"int time\" to \"Date time\". " +
+                    "Consider to declare/implement a mapping method: \"Date map(int value)\"."
+            )
+        })
+    public void conversionSelectionNotAllowedInTwoStepConversionMethodConversion() {
+    }
+
     private FridgeDTO createFridgeDTO() {
         FridgeDTO fridgeDTO = new FridgeDTO();
         ShelveDTO shelveDTO = new ShelveDTO();

processor/src/test/java/org/mapstruct/ap/test/mappingcontrol/NoConversion.java

@@ -0,0 +1,20 @@
+/*
+ * 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.mappingcontrol;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import org.mapstruct.control.MappingControl;
+import org.mapstruct.util.Experimental;
+
+@Retention(RetentionPolicy.CLASS)
+@Experimental
+@MappingControl( MappingControl.Use.DIRECT )
+@MappingControl( MappingControl.Use.MAPPING_METHOD )
+@MappingControl( MappingControl.Use.COMPLEX_MAPPING )
+public @interface NoConversion {
+}