Move autoconfigure getConfig to internal, remove getResource (#5467)

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/AutoConfiguredOpenTelemetrySdk.java

@@ -51,10 +51,10 @@ public abstract class AutoConfiguredOpenTelemetrySdk {
   public abstract OpenTelemetrySdk getOpenTelemetrySdk();
 
   /** Returns the {@link Resource} that was auto-configured. */
-  public abstract Resource getResource();
+  abstract Resource getResource();
 
   /** Returns the {@link ConfigProperties} used for auto-configuration. */
-  public abstract ConfigProperties getConfig();
+  abstract ConfigProperties getConfig();
 
   AutoConfiguredOpenTelemetrySdk() {}
 }

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/internal/AutoConfigureUtil.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.sdk.autoconfigure.internal;
+
+import io.opentelemetry.sdk.autoconfigure.AutoConfiguredOpenTelemetrySdk;
+import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+/**
+ * This class is internal and is hence not for public use. Its APIs are unstable and can change at
+ * any time.
+ */
+public final class AutoConfigureUtil {
+
+  private AutoConfigureUtil() {}
+
+  /** Returns the {@link ConfigProperties} used for auto-configuration. */
+  public static ConfigProperties getConfig(
+      AutoConfiguredOpenTelemetrySdk autoConfiguredOpenTelemetrySdk) {
+    try {
+      Method method = AutoConfiguredOpenTelemetrySdk.class.getDeclaredMethod("getConfig");
+      method.setAccessible(true);
+      return (ConfigProperties) method.invoke(autoConfiguredOpenTelemetrySdk);
+    } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
+      throw new IllegalStateException(
+          "Error calling getConfig on AutoConfiguredOpenTelemetrySdk", e);
+    }
+  }
+}

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/AutoConfigureUtilTest.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.sdk.autoconfigure;
+
+import static java.util.Collections.singletonMap;
+
+import io.opentelemetry.sdk.autoconfigure.internal.AutoConfigureUtil;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class AutoConfigureUtilTest {
+
+  AutoConfiguredOpenTelemetrySdk autoConfiguredOpenTelemetrySdk;
+
+  @BeforeEach
+  void beforeEach() {
+    autoConfiguredOpenTelemetrySdk =
+        AutoConfiguredOpenTelemetrySdk.builder()
+            .addPropertiesSupplier(() -> singletonMap("otel.metrics.exporter", "none"))
+            .addPropertiesSupplier(() -> singletonMap("otel.traces.exporter", "none"))
+            .addPropertiesSupplier(() -> singletonMap("otel.logs.exporter", "none"))
+            .build();
+  }
+
+  @Test
+  void getConfig() {
+    Assertions.assertThat(AutoConfigureUtil.getConfig(autoConfiguredOpenTelemetrySdk))
+        .isSameAs(autoConfiguredOpenTelemetrySdk.getConfig());
+  }
+}