#3370 Prevent stack overflow error for Immutables with custom builder

processor/src/main/java/org/mapstruct/ap/spi/DefaultBuilderProvider.java

@@ -176,6 +176,10 @@ public class DefaultBuilderProvider implements BuilderProvider {
      * @throws MoreThanOneBuilderCreationMethodException if there are multiple builder creation methods
      */
     protected BuilderInfo findBuilderInfo(TypeElement typeElement) {
+        return findBuilderInfo( typeElement, true );
+    }
+
+    protected BuilderInfo findBuilderInfo(TypeElement typeElement, boolean checkParent) {
         if ( shouldIgnore( typeElement ) ) {
             return null;
         }
@@ -203,7 +207,10 @@ public class DefaultBuilderProvider implements BuilderProvider {
             throw new MoreThanOneBuilderCreationMethodException( typeElement.asType(), builderInfo );
         }
 
-        return findBuilderInfo( typeElement.getSuperclass() );
+        if ( checkParent ) {
+            return findBuilderInfo( typeElement.getSuperclass() );
+        }
+        return null;
     }
 
     /**

processor/src/main/java/org/mapstruct/ap/spi/ImmutablesBuilderProvider.java

@@ -35,18 +35,31 @@ public class ImmutablesBuilderProvider extends DefaultBuilderProvider {
         if ( name.length() == 0 || JAVA_JAVAX_PACKAGE.matcher( name ).matches() ) {
             return null;
         }
+
+        // First look if there is a builder defined in my own type
+        BuilderInfo info = findBuilderInfo( typeElement, false );
+        if ( info != null ) {
+            return info;
+        }
+
+        // Check for a builder in the generated immutable type
+        BuilderInfo immutableInfo = findBuilderInfoForImmutables( typeElement );
+        if ( immutableInfo != null ) {
+            return immutableInfo;
+        }
+
+        return super.findBuilderInfo( typeElement.getSuperclass() );
+    }
+
+    protected BuilderInfo findBuilderInfoForImmutables(TypeElement typeElement) {
         TypeElement immutableAnnotation = elementUtils.getTypeElement( IMMUTABLE_FQN );
         if ( immutableAnnotation != null ) {
-            BuilderInfo info = findBuilderInfoForImmutables(
+            return findBuilderInfoForImmutables(
                 typeElement,
                 immutableAnnotation
             );
-            if ( info != null ) {
-                return info;
-            }
         }
-
+        return null;
-        return super.findBuilderInfo( typeElement );
     }
 
     protected BuilderInfo findBuilderInfoForImmutables(TypeElement typeElement,
@@ -55,7 +68,7 @@ public class ImmutablesBuilderProvider extends DefaultBuilderProvider {
             if ( typeUtils.isSameType( annotationMirror.getAnnotationType(), immutableAnnotation.asType() ) ) {
                 TypeElement immutableElement = asImmutableElement( typeElement );
                 if ( immutableElement != null ) {
-                    return super.findBuilderInfo( immutableElement );
+                    return super.findBuilderInfo( immutableElement, false );
                 }
                 else {
                     // Immutables processor has not run yet. Trigger a postpone to the next round for MapStruct

processor/src/test/java/org/mapstruct/ap/test/bugs/_3370/Issue3370BuilderProvider.java

@@ -0,0 +1,25 @@
+/*
+ * 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._3370;
+
+import javax.lang.model.element.Name;
+import javax.lang.model.element.TypeElement;
+
+import org.mapstruct.ap.spi.BuilderInfo;
+import org.mapstruct.ap.spi.BuilderProvider;
+import org.mapstruct.ap.spi.ImmutablesBuilderProvider;
+
+public class Issue3370BuilderProvider extends ImmutablesBuilderProvider implements BuilderProvider {
+
+    @Override
+    protected BuilderInfo findBuilderInfoForImmutables(TypeElement typeElement) {
+        Name name = typeElement.getQualifiedName();
+        if ( name.toString().endsWith( ".Item" ) ) {
+            return super.findBuilderInfo( asImmutableElement( typeElement ) );
+        }
+        return super.findBuilderInfo( typeElement );
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3370/Issue3370Test.java

@@ -0,0 +1,55 @@
+/*
+ * 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._3370;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.mapstruct.ap.spi.AccessorNamingStrategy;
+import org.mapstruct.ap.spi.BuilderProvider;
+import org.mapstruct.ap.spi.ImmutablesAccessorNamingStrategy;
+import org.mapstruct.ap.test.bugs._3370.domain.ImmutableItem;
+import org.mapstruct.ap.test.bugs._3370.domain.Item;
+import org.mapstruct.ap.test.bugs._3370.dto.ItemDTO;
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.ProcessorTest;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.WithServiceImplementation;
+import org.mapstruct.ap.testutil.WithServiceImplementations;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@WithClasses({
+    ItemMapper.class,
+    Item.class,
+    ImmutableItem.class,
+    ItemDTO.class,
+})
+@IssueKey("3370")
+@WithServiceImplementations({
+    @WithServiceImplementation(provides = BuilderProvider.class, value = Issue3370BuilderProvider.class),
+    @WithServiceImplementation(provides = AccessorNamingStrategy.class,
+        value = ImmutablesAccessorNamingStrategy.class),
+})
+public class Issue3370Test {
+
+    @ProcessorTest
+    public void shouldUseBuilderOfImmutableSuperClass() {
+
+        Map<String, String> attributesMap = new HashMap<>();
+        attributesMap.put( "a", "b" );
+        attributesMap.put( "c", "d" );
+
+        ItemDTO item = new ItemDTO( "test", attributesMap );
+
+        Item target = ItemMapper.INSTANCE.map( item );
+
+        assertThat( target ).isNotNull();
+        assertThat( target.getId() ).isEqualTo( "test" );
+        assertThat( target.getAttributes() ).isEqualTo( attributesMap );
+    }
+
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3370/ItemMapper.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._3370;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.ap.test.bugs._3370.domain.Item;
+import org.mapstruct.ap.test.bugs._3370.dto.ItemDTO;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public abstract class ItemMapper {
+
+    public static final ItemMapper INSTANCE = Mappers.getMapper( ItemMapper.class );
+
+    public abstract Item map(ItemDTO itemDTO);
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3370/domain/ImmutableItem.java

@@ -0,0 +1,316 @@
+/*
+ * 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._3370.domain;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * Immutable implementation of {@link Item}.
+ * <p>
+ * Use the builder to create immutable instances:
+ * {@code new Item.Builder()}.
+ */
+@SuppressWarnings("all")
+public final class ImmutableItem extends Item {
+    private final String id;
+    private final Map<String, String> attributes;
+
+    private ImmutableItem(String id, Map<String, String> attributes) {
+        this.id = id;
+        this.attributes = attributes;
+    }
+
+    /**
+     * @return The value of the {@code id} attribute
+     */
+    @Override
+    public String getId() {
+        return id;
+    }
+
+    /**
+     * @return The value of the {@code attributes} attribute
+     */
+    @Override
+    public Map<String, String> getAttributes() {
+        return attributes;
+    }
+
+    /**
+     * Copy the current immutable object by setting a value for the {@link Item#getId() id} attribute.
+     * An equals check used to prevent copying of the same value by returning {@code this}.
+     *
+     * @param id A new value for id
+     * @return A modified copy of the {@code this} object
+     */
+    public final ImmutableItem withId(String id) {
+      if ( this.id.equals( id ) ) {
+        return this;
+      }
+        String newValue = Objects.requireNonNull( id, "id" );
+        return new ImmutableItem( newValue, this.attributes );
+    }
+
+    /**
+     * Copy the current immutable object by replacing the {@link Item#getAttributes() attributes} map with the specified map.
+     * Nulls are not permitted as keys or values.
+     * A shallow reference equality check is used to prevent copying of the same value by returning {@code this}.
+     *
+     * @param attributes The entries to be added to the attributes map
+     * @return A modified copy of {@code this} object
+     */
+    public final ImmutableItem withAttributes(Map<String, ? extends String> attributes) {
+      if ( this.attributes == attributes ) {
+        return this;
+      }
+        Map<String, String> newValue = createUnmodifiableMap( true, false, attributes );
+        return new ImmutableItem( this.id, newValue );
+    }
+
+    /**
+     * This instance is equal to all instances of {@code ImmutableItem} that have equal attribute values.
+     *
+     * @return {@code true} if {@code this} is equal to {@code another} instance
+     */
+    @Override
+    public boolean equals(Object another) {
+      if ( this == another ) {
+        return true;
+      }
+        return another instanceof ImmutableItem
+            && equalTo( (ImmutableItem) another );
+    }
+
+    private boolean equalTo(ImmutableItem another) {
+        return id.equals( another.id )
+            && attributes.equals( another.attributes );
+    }
+
+    /**
+     * Computes a hash code from attributes: {@code id}, {@code attributes}.
+     *
+     * @return hashCode value
+     */
+    @Override
+    public int hashCode() {
+        int h = 31;
+        h = h * 17 + id.hashCode();
+        h = h * 17 + attributes.hashCode();
+        return h;
+    }
+
+    /**
+     * Prints the immutable value {@code Item} with attribute values.
+     *
+     * @return A string representation of the value
+     */
+    @Override
+    public String toString() {
+        return "Item{"
+            + "id=" + id
+            + ", attributes=" + attributes
+            + "}";
+    }
+
+    /**
+     * Creates an immutable copy of a {@link Item} value.
+     * Uses accessors to get values to initialize the new immutable instance.
+     * If an instance is already immutable, it is returned as is.
+     *
+     * @param instance The instance to copy
+     * @return A copied immutable Item instance
+     */
+    public static ImmutableItem copyOf(Item instance) {
+        if ( instance instanceof ImmutableItem ) {
+            return (ImmutableItem) instance;
+        }
+        return new Item.Builder()
+            .from( instance )
+            .build();
+    }
+
+    /**
+     * Builds instances of type {@link ImmutableItem ImmutableItem}.
+     * Initialize attributes and then invoke the {@link #build()} method to create an
+     * immutable instance.
+     * <p><em>{@code Builder} is not thread-safe and generally should not be stored in a field or collection,
+     * but instead used immediately to create instances.</em>
+     */
+    public static class Builder {
+        private static final long INIT_BIT_ID = 0x1L;
+        private long initBits = 0x1L;
+
+        private String id;
+        private Map<String, String> attributes = new LinkedHashMap<String, String>();
+
+        /**
+         * Creates a builder for {@link ImmutableItem ImmutableItem} instances.
+         */
+        public Builder() {
+            if ( !( this instanceof Item.Builder ) ) {
+                throw new UnsupportedOperationException( "Use: new Item.Builder()" );
+            }
+        }
+
+        /**
+         * Fill a builder with attribute values from the provided {@code Item} instance.
+         * Regular attribute values will be replaced with those from the given instance.
+         * Absent optional values will not replace present values.
+         * Collection elements and entries will be added, not replaced.
+         *
+         * @param instance The instance from which to copy values
+         * @return {@code this} builder for use in a chained invocation
+         */
+        public final Item.Builder from(Item instance) {
+            Objects.requireNonNull( instance, "instance" );
+            id( instance.getId() );
+            putAllAttributes( instance.getAttributes() );
+            return (Item.Builder) this;
+        }
+
+        /**
+         * Initializes the value for the {@link Item#getId() id} attribute.
+         *
+         * @param id The value for id
+         * @return {@code this} builder for use in a chained invocation
+         */
+        public final Item.Builder id(String id) {
+            this.id = Objects.requireNonNull( id, "id" );
+            initBits &= ~INIT_BIT_ID;
+            return (Item.Builder) this;
+        }
+
+        /**
+         * Put one entry to the {@link Item#getAttributes() attributes} map.
+         *
+         * @param key   The key in the attributes map
+         * @param value The associated value in the attributes map
+         * @return {@code this} builder for use in a chained invocation
+         */
+        public final Item.Builder putAttributes(String key, String value) {
+            this.attributes.put(
+                Objects.requireNonNull( key, "attributes key" ),
+                Objects.requireNonNull( value, "attributes value" )
+            );
+            return (Item.Builder) this;
+        }
+
+        /**
+         * Put one entry to the {@link Item#getAttributes() attributes} map. Nulls are not permitted
+         *
+         * @param entry The key and value entry
+         * @return {@code this} builder for use in a chained invocation
+         */
+        public final Item.Builder putAttributes(Map.Entry<String, ? extends String> entry) {
+            String k = entry.getKey();
+            String v = entry.getValue();
+            this.attributes.put(
+                Objects.requireNonNull( k, "attributes key" ),
+                Objects.requireNonNull( v, "attributes value" )
+            );
+            return (Item.Builder) this;
+        }
+
+        /**
+         * Sets or replaces all mappings from the specified map as entries for the {@link Item#getAttributes() attributes} map. Nulls are not permitted
+         *
+         * @param attributes The entries that will be added to the attributes map
+         * @return {@code this} builder for use in a chained invocation
+         */
+        public final Item.Builder attributes(Map<String, ? extends String> attributes) {
+            this.attributes.clear();
+            return putAllAttributes( attributes );
+        }
+
+        /**
+         * Put all mappings from the specified map as entries to {@link Item#getAttributes() attributes} map. Nulls are not permitted
+         *
+         * @param attributes The entries that will be added to the attributes map
+         * @return {@code this} builder for use in a chained invocation
+         */
+        public final Item.Builder putAllAttributes(Map<String, ? extends String> attributes) {
+            for ( Map.Entry<String, ? extends String> entry : attributes.entrySet() ) {
+                String k = entry.getKey();
+                String v = entry.getValue();
+                this.attributes.put(
+                    Objects.requireNonNull( k, "attributes key" ),
+                    Objects.requireNonNull( v, "attributes value" )
+                );
+            }
+            return (Item.Builder) this;
+        }
+
+        /**
+         * Builds a new {@link ImmutableItem ImmutableItem}.
+         *
+         * @return An immutable instance of Item
+         * @throws java.lang.IllegalStateException if any required attributes are missing
+         */
+        public ImmutableItem build() {
+            if ( initBits != 0 ) {
+                throw new IllegalStateException( formatRequiredAttributesMessage() );
+            }
+            return new ImmutableItem( id, createUnmodifiableMap( false, false, attributes ) );
+        }
+
+        private String formatRequiredAttributesMessage() {
+            List<String> attributes = new ArrayList<String>();
+          if ( ( initBits & INIT_BIT_ID ) != 0 ) {
+            attributes.add( "id" );
+          }
+            return "Cannot build Item, some of required attributes are not set " + attributes;
+        }
+    }
+
+    private static <K, V> Map<K, V> createUnmodifiableMap(boolean checkNulls, boolean skipNulls,
+                                                          Map<? extends K, ? extends V> map) {
+        switch ( map.size() ) {
+            case 0:
+                return Collections.emptyMap();
+            case 1: {
+                Map.Entry<? extends K, ? extends V> e = map.entrySet().iterator().next();
+                K k = e.getKey();
+                V v = e.getValue();
+                if ( checkNulls ) {
+                    Objects.requireNonNull( k, "key" );
+                    Objects.requireNonNull( v, "value" );
+                }
+                if ( skipNulls && ( k == null || v == null ) ) {
+                    return Collections.emptyMap();
+                }
+                return Collections.singletonMap( k, v );
+            }
+            default: {
+                Map<K, V> linkedMap = new LinkedHashMap<K, V>( map.size() );
+                if ( skipNulls || checkNulls ) {
+                    for ( Map.Entry<? extends K, ? extends V> e : map.entrySet() ) {
+                        K k = e.getKey();
+                        V v = e.getValue();
+                        if ( skipNulls ) {
+                          if ( k == null || v == null ) {
+                            continue;
+                          }
+                        }
+                        else if ( checkNulls ) {
+                            Objects.requireNonNull( k, "key" );
+                            Objects.requireNonNull( v, "value" );
+                        }
+                        linkedMap.put( k, v );
+                    }
+                }
+                else {
+                    linkedMap.putAll( map );
+                }
+                return Collections.unmodifiableMap( linkedMap );
+            }
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3370/domain/Item.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._3370.domain;
+
+import java.util.Collections;
+import java.util.Map;
+
+public abstract class Item {
+
+    public abstract String getId();
+
+    public abstract Map<String, String> getAttributes();
+
+    public static Item.Builder builder() {
+        return new Item.Builder();
+    }
+
+    public static class Builder extends ImmutableItem.Builder {
+
+        public ImmutableItem.Builder addSomeData(String key, String data) {
+            return super.attributes( Collections.singletonMap( key, data ) );
+        }
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_3370/dto/ItemDTO.java

@@ -0,0 +1,26 @@
+/*
+ * 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._3370.dto;
+
+import java.util.Map;
+
+public class ItemDTO {
+    private final String id;
+    private final Map<String, String> attributes;
+
+    public ItemDTO(String id, Map<String, String> attributes) {
+        this.id = id;
+        this.attributes = attributes;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public Map<String, String> getAttributes() {
+        return attributes;
+    }
+}