android-record: Support deserializing polymorphic members of records (fixes FasterXML#248).

Author: HelloOO7

android-record/src/main/java/com/fasterxml/jackson/module/androidrecord/AndroidRecordInstantiator.java

@@ -0,0 +1,52 @@
+package com.fasterxml.jackson.module.androidrecord;
+
+import com.fasterxml.jackson.databind.BeanDescription;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.deser.CreatorProperty;
+import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
+import com.fasterxml.jackson.databind.deser.ValueInstantiator;
+import com.fasterxml.jackson.databind.deser.std.StdValueInstantiator;
+import com.fasterxml.jackson.databind.introspect.AnnotatedParameter;
+import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
+
+public class AndroidRecordInstantiator extends StdValueInstantiator {
+  protected AndroidRecordInstantiator(StdValueInstantiator src) {
+    super(src);
+  }
+
+  public ValueInstantiator createContextual(DeserializationContext ctxt, BeanDescription beanDesc) throws JsonMappingException {
+    boolean wasChanged = false;
+    SettableBeanProperty[] newCtorArgs = new SettableBeanProperty[_constructorArguments.length];
+    for (int i = 0; i < _constructorArguments.length; i++) {
+      SettableBeanProperty prop = _constructorArguments[i];
+      if (!prop.hasValueTypeDeserializer()) {
+        TypeDeserializer typeDeserializer = ctxt.getFactory().findTypeDeserializer(ctxt.getConfig(), prop.getType());
+        if (typeDeserializer != null) {
+          prop = CreatorProperty.construct(
+                  prop.getFullName(),
+                  prop.getType(),
+                  prop.getWrapperName(),
+                  typeDeserializer,
+                  prop.getMember().getAllAnnotations(),
+                  (AnnotatedParameter) prop.getMember(),
+                  prop.getCreatorIndex(),
+                  ctxt.getAnnotationIntrospector().findInjectableValue(prop.getMember()),
+                  prop.getMetadata()
+          );
+          wasChanged = true;
+        }
+      }
+      newCtorArgs[i] = prop;
+    }
+
+
+    if (wasChanged) {
+      AndroidRecordInstantiator newInstantiator = new AndroidRecordInstantiator(this);
+      newInstantiator._constructorArguments = newCtorArgs;
+      return newInstantiator;
+    } else {
+      return this;
+    }
+  }
+}

android-record/src/main/java/com/fasterxml/jackson/module/androidrecord/AndroidRecordModule.java

@@ -153,10 +153,13 @@ && isDesugaredRecordClass(raw)) {
                   null, null, parameter.getAllAnnotations(), parameter, i, injectable, null);
         }
 
-        ((StdValueInstantiator) defaultInstantiator).configureFromObjectSettings(null, null, null, null,
-                constructor, properties);
+        AndroidRecordInstantiator instantiator = new AndroidRecordInstantiator((StdValueInstantiator) defaultInstantiator);
+        instantiator.configureFromObjectSettings(null, null, null, null, constructor, properties);
+
         ClassUtil.checkAndFixAccess(constructor.getAnnotated(), false);
         found = true;
+
+        defaultInstantiator = instantiator;
       }
     }
 

android-record/src/test/java/com/fasterxml/jackson/module/androidrecord/AbstractRecordMemberTest.java

@@ -0,0 +1,75 @@
+package com.fasterxml.jackson.module.androidrecord;
+
+import com.android.tools.r8.RecordTag;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class AbstractRecordMemberTest extends BaseMapTest {
+
+  static final class RootRecord extends RecordTag {
+
+    private final AbstractMember member;
+
+    public RootRecord(AbstractMember member) {
+      this.member = member;
+    }
+
+    public AbstractMember member() {
+      return member;
+    }
+  }
+
+  @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "@class")
+  @JsonSubTypes({
+          @JsonSubTypes.Type(value = StringMember.class, name = "string"),
+          @JsonSubTypes.Type(value = IntMember.class, name = "int")
+  })
+  static abstract class AbstractMember {
+  }
+
+  static final class StringMember extends AbstractMember {
+
+    private final String val;
+
+    @JsonCreator
+    public StringMember(@JsonProperty("val") String val) {
+      this.val = val;
+    }
+
+    public String getVal() {
+      return val;
+    }
+  }
+
+  static final class IntMember extends AbstractMember {
+
+    private final int val;
+
+    @JsonCreator
+    public IntMember(@JsonProperty("val") int val) {
+      this.val = val;
+    }
+
+    public int getVal() {
+      return val;
+    }
+  }
+
+  private final ObjectMapper MAPPER = newJsonMapper();
+
+  /*
+  /**********************************************************************
+  /* https://github.com/FasterXML/jackson-modules-base/issues/248
+  /**********************************************************************
+   */
+  public void testDeserializeRecordWithAbstractMember() throws Exception {
+    RootRecord value = MAPPER.readValue("{\"member\":{\"@class\":\"string\",\"val\":\"Hello, abstract member!\"}}",
+            RootRecord.class);
+    assertNotNull(value.member());
+    assertEquals(StringMember.class, value.member().getClass());
+    assertEquals("Hello, abstract member!", ((StringMember)value.member()).getVal());
+  }
+}