From e9fd301bc6e5d8fc56a6b077cff7f3b7553633ac Mon Sep 17 00:00:00 2001
From: Kostya <mail@sartin.in>
Date: Wed, 22 Jul 2026 21:00:17 +0000
Subject: done i guess

---
 .../reflection/api/ReflectionInvestigator.java     | 55 +++++++++++++++-------
 1 file changed, 38 insertions(+), 17 deletions(-)

(limited to 'ex1/src/main/java')

diff --git a/ex1/src/main/java/reflection/api/ReflectionInvestigator.java b/ex1/src/main/java/reflection/api/ReflectionInvestigator.java
index 2d18b34..d6902bd 100644
--- a/ex1/src/main/java/reflection/api/ReflectionInvestigator.java
+++ b/ex1/src/main/java/reflection/api/ReflectionInvestigator.java
@@ -1,5 +1,6 @@
 package reflection.api;
 
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Modifier;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -57,50 +58,70 @@ public class ReflectionInvestigator implements Investigator {
 
   @Override
   public boolean isExtending() {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'isExtending'");
+    return classInfo.getSuperclass() != Object.class;
   }
 
   @Override
   public String getParentClassSimpleName() {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'getParentClassSimpleName'");
+    return classInfo.getSuperclass().getSimpleName();
   }
 
   @Override
   public boolean isParentClassAbstract() {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'isParentClassAbstract'");
+    return Modifier.isAbstract(classInfo.getSuperclass().getModifiers());
   }
 
   @Override
   public Set<String> getNamesOfAllFieldsIncludingInheritanceChain() {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException(
-        "Unimplemented method 'getNamesOfAllFieldsIncludingInheritanceChain'");
+    return Stream.of(classInfo.getFields()).map(f -> f.getName()).collect(Collectors.toSet());
   }
 
   @Override
   public int invokeMethodThatReturnsInt(String methodName, Object... args) {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'invokeMethodThatReturnsInt'");
+    try {
+      return (int) classInfo.getMethod(methodName).invoke(subjectInstance, args);
+    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
+      return 0;
+    }
   }
 
   @Override
   public Object createInstance(int numberOfArgs, Object... args) {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'createInstance'");
+    var ctors = classInfo.getDeclaredConstructors();
+    for (var ctor : ctors) {
+      if (ctor.getGenericParameterTypes().length == numberOfArgs) {
+        try {
+          return ctor.newInstance(args);
+        } catch (InstantiationException
+            | IllegalAccessException
+            | IllegalArgumentException
+            | InvocationTargetException e) {
+          break;
+        }
+      }
+    }
+    return null;
   }
 
   @Override
   public Object elevateMethodAndInvoke(String name, Class<?>[] parametersTypes, Object... args) {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'elevateMethodAndInvoke'");
+    try {
+      var method = classInfo.getMethod(name);
+      method.setAccessible(true);
+      return method.invoke(subjectInstance, args);
+    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
+      return null;
+    }
   }
 
   @Override
   public String getInheritanceChain(String delimiter) {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'getInheritanceChain'");
+    var sb = new StringBuilder();
+    var cursor = classInfo;
+    while (cursor != null) {
+      sb.append(cursor.getName() + " -> ");
+      cursor = cursor.getSuperclass();
+    }
+    return sb.toString();
   }
 }
-- 
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