Behavior of AnnotatedMember.equals() (#3187) (#3195)

Author: klaasdellschaft

release-notes/CREDITS-2.x

@@ -1351,7 +1351,7 @@ Morten Andersen-Gott (magott@github)
   * Contributed #3174: DOM `Node` serialization omits the default namespace declaration
    (2.13.0)
 
-Klaas Sellschaft (klaasdellschaft@github)
+Klaas Dellschaft (klaasdellschaft@github)
   * Contributed #3177: Support `suppressed` property when deserializing `Throwable`
    (2.13.0)
 

src/main/java/com/fasterxml/jackson/databind/introspect/AnnotatedConstructor.java

@@ -1,10 +1,12 @@
 package com.fasterxml.jackson.databind.introspect;
 
-import java.lang.reflect.*;
-
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.util.ClassUtil;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Member;
+import java.lang.reflect.Type;
+
 public final class AnnotatedConstructor
     extends AnnotatedWithParams
 {
@@ -178,12 +180,20 @@ public String toString() {
     public int hashCode() {
         return _constructor.getName().hashCode();
     }
-    
+
     @Override
     public boolean equals(Object o) {
         if (o == this) return true;
-        return ClassUtil.hasClass(o, getClass())
-                && (((AnnotatedConstructor) o)._constructor == _constructor);
+        if (!ClassUtil.hasClass(o, getClass())) {
+            return false;
+        }
+
+        AnnotatedConstructor other = (AnnotatedConstructor) o;
+        if (other._constructor == null) {
+            return _constructor == null;
+        } else {
+            return other._constructor.equals(_constructor);
+        }
     }
 
     /*

src/main/java/com/fasterxml/jackson/databind/introspect/AnnotatedField.java

@@ -135,8 +135,16 @@ public int hashCode() {
     @Override
     public boolean equals(Object o) {
         if (o == this) return true;
-        return ClassUtil.hasClass(o, getClass())
-                && (((AnnotatedField) o)._field == _field);
+        if (!ClassUtil.hasClass(o, getClass())) {
+            return false;
+        }
+
+        AnnotatedField other = (AnnotatedField) o;
+        if (other._field == null) {
+            return _field == null;
+        } else {
+            return other._field.equals(_field);
+        }
     }
 
     @Override

src/main/java/com/fasterxml/jackson/databind/introspect/AnnotatedMethod.java

@@ -253,8 +253,16 @@ public int hashCode() {
     @Override
     public boolean equals(Object o) {
         if (o == this) return true;
-        return ClassUtil.hasClass(o, getClass())
-                && (((AnnotatedMethod) o)._method == _method);
+        if (!ClassUtil.hasClass(o, getClass())) {
+            return false;
+        }
+
+        AnnotatedMethod other = (AnnotatedMethod) o;
+        if (other._method == null) {
+            return _method == null;
+        } else {
+            return other._method.equals(_method);
+        }
     }
 
     /*

src/test/java/com/fasterxml/jackson/databind/introspect/AnnotatedMemberEqualityTest.java

@@ -0,0 +1,80 @@
+package com.fasterxml.jackson.databind.introspect;
+
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.DeserializationConfig;
+import com.fasterxml.jackson.databind.JavaType;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.json.JsonMapper;
+
+public class AnnotatedMemberEqualityTest extends BaseMapTest {
+
+    private static class SomeBean {
+
+        private String value;
+
+        public SomeBean(String value) {
+            this.value = value;
+        }
+
+        public String getValue() {
+            return value;
+        }
+
+        public void setValue(String value) {
+            this.value = value;
+        }
+    }
+
+    public void testAnnotatedConstructorEquality() {
+        ObjectMapper mapper = new JsonMapper();
+        DeserializationConfig context = mapper.getDeserializationConfig();
+        JavaType beanType = mapper.constructType(SomeBean.class);
+
+        AnnotatedClass instance1 = AnnotatedClassResolver.resolve(context, beanType, context);
+        AnnotatedClass instance2 = AnnotatedClassResolver.resolve(context, beanType, context);
+
+        AnnotatedConstructor constructor1 = instance1.getConstructors().get(0);
+        AnnotatedConstructor constructor2 = instance2.getConstructors().get(0);
+
+        assertEquals(instance1, instance2);
+        assertEquals(constructor1.getAnnotated(), constructor2.getAnnotated());
+        assertEquals(constructor1, constructor2);
+        assertEquals(constructor1.getParameter(0), constructor2.getParameter(0));
+    }
+
+    public void testAnnotatedMethodEquality() {
+        ObjectMapper mapper = new JsonMapper();
+        DeserializationConfig context = mapper.getDeserializationConfig();
+        JavaType beanType = mapper.constructType(SomeBean.class);
+
+        AnnotatedClass instance1 = AnnotatedClassResolver.resolve(context, beanType, context);
+        AnnotatedClass instance2 = AnnotatedClassResolver.resolve(context, beanType, context);
+
+        String methodName = "setValue";
+        Class<?>[] paramTypes = {String.class};
+        AnnotatedMethod method1 = instance1.findMethod(methodName, paramTypes);
+        AnnotatedMethod method2 = instance2.findMethod(methodName, paramTypes);
+
+        assertEquals(instance1, instance2);
+        assertEquals(method1.getAnnotated(), method2.getAnnotated());
+        assertEquals(method1, method2);
+        assertEquals(method1.getParameter(0), method2.getParameter(0));
+    }
+
+    public void testAnnotatedFieldEquality() {
+        ObjectMapper mapper = new JsonMapper();
+        DeserializationConfig context = mapper.getDeserializationConfig();
+        JavaType beanType = mapper.constructType(SomeBean.class);
+
+        AnnotatedClass instance1 = AnnotatedClassResolver.resolve(context, beanType, context);
+        AnnotatedClass instance2 = AnnotatedClassResolver.resolve(context, beanType, context);
+
+        AnnotatedField field1 = instance1.fields().iterator().next();
+        AnnotatedField field2 = instance2.fields().iterator().next();
+
+        assertEquals(instance1, instance2);
+        assertEquals(field1.getAnnotated(), field2.getAnnotated());
+        assertEquals(field1, field2);
+    }
+
+}