#243: Do not warn for unmapped source properties on maps

src/main/java/org/mapstruct/intellij/codeinsight/references/BaseReference.java

@@ -43,7 +43,7 @@ public abstract class BaseReference extends PsiReferenceBase<PsiElement> impleme
      * @return The mapping method that this reference belongs to
      */
     @Nullable
-    PsiMethod getMappingMethod() {
+    public PsiMethod getMappingMethod() {
         PsiElement element = getElement();
         UExpression expression = UastContextKt.toUElement( element, UExpression.class );
         if ( expression != null ) {

src/main/java/org/mapstruct/intellij/codeinsight/references/BaseValueMappingReference.java

@@ -47,7 +47,7 @@ public final PsiElement resolve() {
 
     @Override
     @Nullable
-    PsiMethod getMappingMethod() {
+    public PsiMethod getMappingMethod() {
         PsiMethod mappingMethod = super.getMappingMethod();
         if ( isNotValueMapping( mappingMethod ) ) {
             return null;

src/main/java/org/mapstruct/intellij/codeinsight/references/MapstructBaseReference.java

@@ -69,7 +69,8 @@ public final PsiElement resolve() {
         }
 
         if ( previous != null ) {
-            PsiType psiType = canDescendIntoType( previous.resolvedType() ) ? previous.resolvedType() : null;
+            PsiType previousResolvedType = previous.resolvedType();
+            PsiType psiType = supportsNestedReferenceForType( previousResolvedType ) ? previousResolvedType : null;
             return psiType == null ? null : resolveInternal( value, psiType );
         }
 
@@ -78,6 +79,10 @@ public final PsiElement resolve() {
         return mappingMethod == null ? null : resolveInternal( value, mappingMethod );
     }
 
+    protected boolean supportsNestedReferenceForType(@Nullable PsiType psiType) {
+        return canDescendIntoType( psiType );
+    }
+
     /**
      * Resolved the reference from the {@code value} for the reference {@code psiClass}
      *

src/main/java/org/mapstruct/intellij/codeinsight/references/MapstructSourceReference.java

@@ -57,6 +57,10 @@ PsiElement resolveInternal(@NotNull String value, @NotNull PsiType psiType) {
             return null;
         }
 
+        if ( MapstructUtil.isMapWithStringKeyType( psiType ) ) {
+            return psiClass;
+        }
+
         PsiRecordComponent recordComponent = findRecordComponent( value, psiClass );
         if ( recordComponent != null ) {
             return recordComponent;
@@ -78,6 +82,11 @@ PsiElement resolveInternal(@NotNull String value, @NotNull PsiType psiType) {
         return null;
     }
 
+    @Override
+    protected boolean supportsNestedReferenceForType(@Nullable PsiType psiType) {
+        return super.supportsNestedReferenceForType( psiType ) || MapstructUtil.isMapWithStringKeyType( psiType );
+    }
+
     @Override
     PsiElement resolveInternal(@NotNull String value, @NotNull PsiMethod mappingMethod) {
         PsiParameter[] sourceParameters = MapstructUtil.getSourceParameters( mappingMethod );

src/main/java/org/mapstruct/intellij/inspection/MapstructReferenceInspection.java

@@ -13,22 +13,28 @@
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiElementVisitor;
 import com.intellij.psi.PsiLanguageInjectionHost;
+import com.intellij.psi.PsiMethod;
+import com.intellij.psi.PsiParameter;
 import com.intellij.psi.PsiReference;
+import com.intellij.psi.PsiType;
 import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.mapstruct.intellij.codeinsight.references.BaseReference;
 import org.mapstruct.intellij.codeinsight.references.BaseValueMappingReference;
+import org.mapstruct.intellij.util.MapstructUtil;
 
 /**
  * Inspection that checks if mapstruct references can be resolved.
- * @see BaseReference
+ *
  * @author hduelme
+ * @see BaseReference
  */
 public class MapstructReferenceInspection extends InspectionBase {
 
     @Override
     @NotNull PsiElementVisitor buildVisitorInternal(@NotNull ProblemsHolder holder, boolean isOnTheFly) {
-        return new MapstructReferenceVisitor(holder);
+        return new MapstructReferenceVisitor( holder );
     }
 
     private static class MapstructReferenceVisitor extends PsiElementVisitor {
@@ -50,8 +56,10 @@ public void visitElement(@NotNull PsiElement element) {
                         TextRange range = psiReference.getRangeInElement();
                         if ( range.isEmpty() && range.getStartOffset() == 1 && "\"\"".equals( element.getText() ) ) {
                             String message = ProblemsHolder.unresolvedReferenceMessage( baseReference );
-                            holder.registerProblem( element, message, ProblemHighlightType.LIKE_UNKNOWN_SYMBOL,
-                                    TextRange.create( 0, 2 ) );
+                            holder.registerProblem(
+                                element, message, ProblemHighlightType.LIKE_UNKNOWN_SYMBOL,
+                                TextRange.create( 0, 2 )
+                            );
                         }
                         else if ( shouldRegisterProblem( baseReference ) ) {
                             holder.registerProblem( psiReference );
@@ -67,9 +75,28 @@ private boolean shouldRegisterProblem(BaseReference reference) {
                 return valueMappingReference.getEnumClass() != null;
             }
 
+            if ( hasSingleStringKeyMapSourceParameter( reference.getMappingMethod() ) ) {
+                // MapStruct allows source values as map keys, even if they are not resolvable as Java properties.
+                // Therefore, we don't report an unresolved reference problem here.
+                return false;
+            }
+
             return !containingClassIsAnnotationType( reference.getElement() );
         }
 
+        private boolean hasSingleStringKeyMapSourceParameter(@Nullable PsiMethod mappingMethod) {
+
+            if ( mappingMethod != null ) {
+                PsiParameter[] parameters = MapstructUtil.getSourceParameters( mappingMethod );
+                if ( parameters.length == 1 ) {
+                    PsiType parameterType = parameters[0].getType();
+                    return MapstructUtil.isMapWithStringKeyType( parameterType );
+                }
+            }
+
+            return false;
+        }
+
         private boolean containingClassIsAnnotationType(PsiElement element) {
 
             PsiClass containingClass = PsiTreeUtil.getParentOfType( element, PsiClass.class );

src/main/java/org/mapstruct/intellij/util/MapstructUtil.java

@@ -659,4 +659,33 @@ public static boolean isInheritInverseConfiguration(PsiMethod method) {
         return isAnnotated( method, INHERIT_INVERSE_CONFIGURATION_FQN, AnnotationUtil.CHECK_TYPE );
     }
 
+    /**
+     * Checks if the given type is a {@link java.util.Map} with a {@link String} key type.
+     *
+     * @param type to be checked
+     * @return {@code true} if the {@code type} is a {@link java.util.Map} with a {@link String} key type,
+     * {@code false} otherwise
+     */
+    public static boolean isMapWithStringKeyType(@Nullable PsiType type) {
+        if ( type == null ) {
+            return false;
+        }
+
+        PsiClass psiClass = PsiUtil.resolveClassInType( type );
+        if ( psiClass == null ||
+            !CommonClassNames.JAVA_UTIL_MAP.equals( psiClass.getQualifiedName() ) ) {
+            return false;
+        }
+
+        if ( !( type instanceof PsiClassType ct ) ) {
+            return false;
+        }
+
+        PsiType[] parameters = ct.getParameters();
+        if ( parameters.length != 2 ) {
+            return false;
+        }
+
+        return parameters[0].equalsToText( CommonClassNames.JAVA_LANG_STRING );
+    }
 }

src/test/java/org/mapstruct/intellij/bugs/_243/DisableSourcePropertyInspectionOnMapTest.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.intellij.bugs._243;
+
+import org.jetbrains.annotations.NotNull;
+import org.mapstruct.intellij.inspection.BaseInspectionTest;
+import org.mapstruct.intellij.inspection.MapstructReferenceInspection;
+
+/**
+ * @author Oliver Erhart
+ */
+public class DisableSourcePropertyInspectionOnMapTest extends BaseInspectionTest {
+
+    @Override
+    protected String getTestDataPath() {
+        return "testData/bugs/_243";
+    }
+
+    @NotNull
+    @Override
+    protected Class<MapstructReferenceInspection> getInspection() {
+        return MapstructReferenceInspection.class;
+    }
+
+    public void testDisableSourcePropertyInspectionOnMap() {
+        doTest();
+    }
+
+    public void testDisableSourcePropertyInspectionOnMapErroneous() {
+        doTest();
+    }
+}

testData/bugs/_243/DisableSourcePropertyInspectionOnMap.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
+ */
+
+import java.time.LocalDate;
+import java.util.Map;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.MappingTarget;
+
+@Mapper
+abstract class Issue243Mapper {
+
+    @Mapping(source = "exDate", target = "exDate")
+    @Mapping(source = "payDate", target = "payDate")
+    public abstract CorporateAction mapWithStringKeyMap(Map<String, String> rowValues);
+
+    @Mapping(source = "exDate", target = "exDate")
+    public abstract void updateWithStringKeyMap(Map<String, String> rowValues, @MappingTarget CorporateAction target);
+
+    @Mapping(source = "exDate", target = "exDate")
+    public abstract CorporateAction mapWithObjectValueMap(Map<String, Object> rowValues);
+
+    @Mapping(source = "rowValues.exDate", target = "exDate")
+    @Mapping(source = "payDate", target = "payDate")
+    public abstract CorporateAction mapWithMultipleSourcesAndMapName(
+        Map<String, String> rowValues,
+        LocalDate payDate
+    );
+}
+
+class CorporateAction {
+    public LocalDate exDate;
+    public LocalDate payDate;
+}

testData/bugs/_243/DisableSourcePropertyInspectionOnMapErroneous.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at https://www.apache.org/licenses/LICENSE-2.0
+ */
+
+import java.time.LocalDate;
+import java.util.Map;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.MappingTarget;
+
+@Mapper
+abstract class Issue243ErroneousMapper {
+
+    @Mapping(source = "<error descr="Unknown property 'exDate'">exDate</error>", target = "exDate")
+    public abstract CorporateAction mapWithIntegerKeyMap(Map<Integer, String> rowValues);
+
+    @Mapping(source = "<error descr="Unknown property 'exDate'">exDate</error>", target = "exDate")
+    public abstract void updateWithIntegerKeyMap(
+        Map<Integer, String> rowValues,
+        @MappingTarget CorporateAction target
+    );
+
+    @Mapping(source = "<error descr="Unknown property 'exDate'">exDate</error>", target = "exDate")
+    @Mapping(source = "payDate", target = "payDate")
+    public abstract CorporateAction mapWithMultipleSources(
+        Map<String, String> rowValues,
+        LocalDate payDate
+    );
+}
+
+class CorporateAction {
+    public LocalDate exDate;
+    public LocalDate payDate;
+}