Allow users to access factory method params info

Closes testng-team#3111

TestNG now exposes the IParameterInfo interface 
Via which you can extract the following details
Pertaining to a factory powered test.

* the index - which would match with what was 
Specified in the “indices” attribute of the “Factory” 
Annotation. If nothing was specified, then this
Would be equal to a running count on the total instances.

* current index - which represents a running count
On the total instances.

* The parameters of the factory method

* The instance that was produced.

Author: krmahadevan

CHANGES.txt

@@ -1,4 +1,5 @@
 Current (7.11.0)
+Fixed: GITHUB-3111: Replacement API for IClass.getInstanceHashCodes() and IClass.getInstances(boolean) (Krishnan Mahadevan)
 
 7.10.1
 Fixed: GITHUB-3110: Update from testng 7.9.0 to 7.10.0 break maven build with junit5 (Krishnan Mahadevan)

testng-core-api/src/main/java/org/testng/IParameterInfo.java

@@ -0,0 +1,36 @@
+package org.testng;
+
+/** Represents the ability to retrieve the parameters associated with a factory method. */
+public interface IParameterInfo {
+
+  /** @return - The actual instance associated with a factory method */
+  Object getInstance();
+
+  /**
+   * @return - The actual index of instance associated with a factory method. This index has a 1:1
+   *     correspondence with what were specified via the <code>indices</code> attribute of the
+   *     <code>@Factory</code> annotation. For e.g., lets say you specified the indices to the "1"
+   *     and your factory returned 4 instances, then the instance on which this method is invoked
+   *     would have the value as "1".
+   */
+  int getIndex();
+
+  /**
+   * @return - returns an index which indicates the running position in the array of test class
+   *     instances that were produced by a <code>@Factory</code> annotated constructor or static
+   *     method. For e.g., lets say your <code>@Factory</code> method returned 4 instances, then
+   *     each of the invocations to this method would return a value from <code>0</code> to <code>3
+   *     </code>
+   */
+  int currentIndex();
+
+  /** @return - The parameters associated with the factory method as an array. */
+  Object[] getParameters();
+
+  static Object embeddedInstance(Object original) {
+    if (original instanceof IParameterInfo) {
+      return ((IParameterInfo) original).getInstance();
+    }
+    return original;
+  }
+}

testng-core-api/src/main/java/org/testng/internal/IParameterInfo.java

@@ -1,21 +1,9 @@
 package org.testng.internal;
 
-/** Represents the ability to retrieve the parameters associated with a factory method. */
-public interface IParameterInfo {
-
-  /** @return - The actual instance associated with a factory method */
-  Object getInstance();
-
-  /** @return - The actual index of instance associated with a factory method */
-  int getIndex();
-
-  /** @return - The parameters associated with the factory method as an array. */
-  Object[] getParameters();
-
-  static Object embeddedInstance(Object original) {
-    if (original instanceof IParameterInfo) {
-      return ((IParameterInfo) original).getInstance();
-    }
-    return original;
-  }
-}
+/**
+ * Represents the ability to retrieve the parameters associated with a factory method.
+ *
+ * @deprecated - This interface stands deprecated as of TestNG <code>7.11.0</code>.
+ */
+@Deprecated
+public interface IParameterInfo extends org.testng.IParameterInfo {}

testng-core/src/main/java/org/testng/internal/BaseTestMethod.java

@@ -153,7 +153,7 @@ public String getMethodName() {
   public Object getInstance() {
     return Optional.ofNullable(m_instance)
         .map(IObject.IdentifiableObject::getInstance)
-        .map(IParameterInfo::embeddedInstance)
+        .map(org.testng.IParameterInfo::embeddedInstance)
         .orElse(null);
   }
 

testng-core/src/main/java/org/testng/internal/ClassImpl.java

@@ -162,7 +162,7 @@ public void addInstance(Object instance) {
   }
 
   private static int computeHashCode(Object instance) {
-    return IParameterInfo.embeddedInstance(instance).hashCode();
+    return org.testng.IParameterInfo.embeddedInstance(instance).hashCode();
   }
 
   private DetailedAttributes newDetailedAttributes(boolean create, String errMsgPrefix) {

testng-core/src/main/java/org/testng/internal/FactoryMethod.java

@@ -7,6 +7,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 import org.testng.DataProviderHolder;
 import org.testng.IDataProviderInterceptor;
@@ -144,8 +145,8 @@ private static String[] getAllGroups(
     return groups.toArray(new String[0]);
   }
 
-  public IParameterInfo[] invoke() {
-    List<IParameterInfo> result = Lists.newArrayList();
+  public org.testng.IParameterInfo[] invoke() {
+    List<org.testng.IParameterInfo> result = Lists.newArrayList();
 
     Map<String, String> allParameterNames = Maps.newHashMap();
     Parameters.MethodParameters methodParameters =
@@ -174,6 +175,7 @@ public IParameterInfo[] invoke() {
     try {
       List<Integer> indices = factoryAnnotation.getIndices();
       int position = 0;
+      AtomicInteger counter = new AtomicInteger(0);
       while (parameterIterator.hasNext()) {
         Object[] parameters = parameterIterator.next();
         if (parameters == null) {
@@ -196,21 +198,27 @@ public IParameterInfo[] invoke() {
             final int instancePosition = position;
             result.addAll(
                 Arrays.stream(testInstances)
-                    .map(instance -> new ParameterInfo(instance, instancePosition, parameters))
+                    .map(
+                        instance ->
+                            new ParameterInfo(
+                                instance, instancePosition, parameters, counter.getAndIncrement()))
                     .collect(Collectors.toList()));
           } else {
             for (Integer index : indices) {
               int i = index - position;
               if (i >= 0 && i < testInstances.length) {
-                result.add(new ParameterInfo(testInstances[i], position, parameters));
+                result.add(
+                    new ParameterInfo(
+                        testInstances[i], position, parameters, counter.getAndIncrement()));
               }
             }
           }
           position += testInstances.length;
         } else {
           if (indices == null || indices.isEmpty() || indices.contains(position)) {
             Object instance = m_objectFactory.newInstance(com.getConstructor(), parameters);
-            result.add(new ParameterInfo(instance, position, parameters));
+            result.add(
+                new ParameterInfo(instance, position, parameters, counter.getAndIncrement()));
           }
           position++;
         }

testng-core/src/main/java/org/testng/internal/ParameterInfo.java

@@ -1,14 +1,16 @@
 package org.testng.internal;
 
 public class ParameterInfo implements IParameterInfo {
-  private Object instance;
+  private final Object instance;
   private final int index;
-  private Object[] parameters;
+  private final Object[] parameters;
+  private final int currentIndex;
 
-  public ParameterInfo(Object instance, int index, Object[] parameters) {
+  public ParameterInfo(Object instance, int index, Object[] parameters, int currentIndex) {
     this.instance = instance;
     this.index = index;
     this.parameters = parameters;
+    this.currentIndex = currentIndex;
   }
 
   @Override
@@ -21,6 +23,11 @@ public int getIndex() {
     return index;
   }
 
+  @Override
+  public int currentIndex() {
+    return currentIndex;
+  }
+
   @Override
   public Object[] getParameters() {
     return parameters;

testng-core/src/main/java/org/testng/internal/TestNGClassFinder.java

@@ -178,7 +178,7 @@ private ClassInfoMap processFactory(IClass ic, ConstructorOrMethod factoryMethod
     // If the factory returned IInstanceInfo, get the class from it,
     // otherwise, just call getClass() on the returned instances
     int i = 0;
-    for (IParameterInfo o : fm.invoke()) {
+    for (org.testng.IParameterInfo o : fm.invoke()) {
       if (o == null) {
         throw new TestNGException(
             "The factory " + fm + " returned a null instance" + "at index " + i);
@@ -329,8 +329,8 @@ private <T> void addInstance(IInstanceInfo<T> ii) {
 
   private void addInstance(IObject.IdentifiableObject o) {
     Class<?> key = o.getInstance().getClass();
-    if (o.getInstance() instanceof IParameterInfo) {
-      key = ((IParameterInfo) o.getInstance()).getInstance().getClass();
+    if (o.getInstance() instanceof org.testng.IParameterInfo) {
+      key = ((org.testng.IParameterInfo) o.getInstance()).getInstance().getClass();
     }
     addInstance(key, o);
   }

testng-core/src/test/java/test/factory/FactoryIntegrationTest.java

@@ -3,13 +3,24 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.failBecauseExceptionWasNotThrown;
 
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
 import org.testng.Assert;
+import org.testng.IParameterInfo;
+import org.testng.ITestListener;
+import org.testng.ITestResult;
 import org.testng.TestListenerAdapter;
 import org.testng.TestNG;
 import org.testng.TestNGException;
+import org.testng.annotations.DataProvider;
 import org.testng.annotations.Test;
 import test.InvokedMethodNameListener;
 import test.SimpleBaseTest;
+import test.factory.issue3111.SimpleFactoryPoweredTestSample;
+import test.factory.issue3111.SimpleFactoryPoweredTestWithIndicesSample;
+import test.factory.issue3111.SimpleFactoryPoweredTestWithoutDataProviderSample;
+import test.factory.issue3111.SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample;
 
 public class FactoryIntegrationTest extends SimpleBaseTest {
 
@@ -22,7 +33,9 @@ public void testExceptionWithNonStaticFactoryMethod() {
     } catch (TestNGException e) {
       assertThat(e)
           .hasMessage(
-              "\nCan't invoke public java.lang.Object[] test.factory.GitHub876Sample.createInstances(): either make it static or add a no-args constructor to your class");
+              "\nCan't invoke public java.lang.Object[] test.factory.GitHub876Sample"
+                  + ".createInstances(): either make it static or add a no-args constructor to "
+                  + "your class");
     }
   }
 
@@ -46,7 +59,8 @@ public void testExceptionWithBadFactoryMethodReturnType() {
     } catch (TestNGException e) {
       assertThat(e)
           .hasMessage(
-              "\ntest.factory.BadMethodReturnTypeFactory.createInstances MUST return [ java.lang.Object[] or org.testng.IInstanceInfo[] ] but returns java.lang.Object");
+              "\ntest.factory.BadMethodReturnTypeFactory.createInstances MUST return [ java.lang"
+                  + ".Object[] or org.testng.IInstanceInfo[] ] but returns java.lang.Object");
     }
   }
 
@@ -65,4 +79,31 @@ public void doubleFactoryMethodShouldWork() {
             "FactoryBaseSample{1}#f",
             "FactoryBaseSample{2}#f", "FactoryBaseSample{3}#f", "FactoryBaseSample{4}#f");
   }
+
+  @Test(dataProvider = "testdata", description = "GITHUB-3111")
+  public void ensureCurrentIndexWorksForFactoryPoweredTests(Class<?> klass, Integer[] expected) {
+    List<IParameterInfo> params = new ArrayList<>();
+    TestNG testng = create(klass);
+    testng.addListener(
+        new ITestListener() {
+          @Override
+          public void onTestSuccess(ITestResult result) {
+            params.add(result.getMethod().getFactoryMethodParamsInfo());
+          }
+        });
+    testng.run();
+    List<Integer> actualIndices =
+        params.stream().map(IParameterInfo::currentIndex).sorted().collect(Collectors.toList());
+    assertThat(actualIndices).containsExactly(expected);
+  }
+
+  @DataProvider(name = "testdata")
+  public Object[][] testdata() {
+    return new Object[][] {
+      {SimpleFactoryPoweredTestSample.class, new Integer[] {0, 1, 2}},
+      {SimpleFactoryPoweredTestWithIndicesSample.class, new Integer[] {0}},
+      {SimpleFactoryPoweredTestWithoutDataProviderSample.class, new Integer[] {0, 1, 2}},
+      {SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample.class, new Integer[] {0}},
+    };
+  }
 }

testng-core/src/test/java/test/factory/issue3111/SimpleFactoryPoweredTestSample.java

@@ -0,0 +1,26 @@
+package test.factory.issue3111;
+
+import org.testng.Reporter;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Factory;
+import org.testng.annotations.Test;
+
+public class SimpleFactoryPoweredTestSample {
+
+  private final int i;
+
+  @Factory(dataProvider = "data")
+  public SimpleFactoryPoweredTestSample(int i) {
+    this.i = i;
+  }
+
+  @Test
+  public void test() {
+    Reporter.log(Integer.toString(i));
+  }
+
+  @DataProvider
+  public static Object[][] data() {
+    return new Object[][] {{1}, {2}, {3}};
+  }
+}

testng-core/src/test/java/test/factory/issue3111/SimpleFactoryPoweredTestWithIndicesSample.java

@@ -0,0 +1,28 @@
+package test.factory.issue3111;
+
+import org.testng.Reporter;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Factory;
+import org.testng.annotations.Test;
+
+public class SimpleFactoryPoweredTestWithIndicesSample {
+
+  private final int i;
+
+  @Factory(
+      dataProvider = "data",
+      indices = {1})
+  public SimpleFactoryPoweredTestWithIndicesSample(int i) {
+    this.i = i;
+  }
+
+  @Test
+  public void test() {
+    Reporter.log(Integer.toString(i));
+  }
+
+  @DataProvider
+  public static Object[][] data() {
+    return new Object[][] {{1}, {2}, {3}};
+  }
+}

testng-core/src/test/java/test/factory/issue3111/SimpleFactoryPoweredTestWithoutDataProviderSample.java

@@ -0,0 +1,28 @@
+package test.factory.issue3111;
+
+import org.testng.Reporter;
+import org.testng.annotations.Factory;
+import org.testng.annotations.Test;
+
+public class SimpleFactoryPoweredTestWithoutDataProviderSample {
+
+  private final int i;
+
+  public SimpleFactoryPoweredTestWithoutDataProviderSample(int i) {
+    this.i = i;
+  }
+
+  @Test
+  public void test() {
+    Reporter.log(Integer.toString(i));
+  }
+
+  @Factory
+  public static Object[] data() {
+    return new Object[] {
+      new SimpleFactoryPoweredTestWithoutDataProviderSample(1),
+      new SimpleFactoryPoweredTestWithoutDataProviderSample(2),
+      new SimpleFactoryPoweredTestWithoutDataProviderSample(3),
+    };
+  }
+}

testng-core/src/test/java/test/factory/issue3111/SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample.java

@@ -0,0 +1,28 @@
+package test.factory.issue3111;
+
+import org.testng.Reporter;
+import org.testng.annotations.Factory;
+import org.testng.annotations.Test;
+
+public class SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample {
+
+  private final int i;
+
+  public SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample(int i) {
+    this.i = i;
+  }
+
+  @Test
+  public void test() {
+    Reporter.log(Integer.toString(i));
+  }
+
+  @Factory(indices = {1})
+  public static Object[] data() {
+    return new Object[] {
+      new SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample(1),
+      new SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample(2),
+      new SimpleFactoryPoweredTestWithoutDataProviderWithIndicesSample(3),
+    };
+  }
+}