support gcp use case

Author: zeitlinger

instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/config/bridge/ConfigPropertiesUtil.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.api.incubator.config.bridge;
+
+public final class ConfigPropertiesUtil {
+  private ConfigPropertiesUtil() {}
+
+  public static String propertyYamlPath(String propertyName) {
+    return yamlPath(propertyName);
+  }
+
+  static String yamlPath(String property) {
+    String[] segments = DeclarativeConfigPropertiesBridge.getSegments(property);
+    if (segments.length == 0) {
+      throw new IllegalArgumentException("Invalid property: " + property);
+    }
+
+    return "'instrumentation/development' / 'java' / '" + String.join("' / '", segments) + "'";
+  }
+}

instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/config/bridge/DeclarativeConfigPropertiesBridge.java

@@ -169,7 +169,7 @@ private <T> T getPropertyValue(
     return extractor.apply(target, lastPart);
   }
 
-  private static String[] getSegments(String property) {
+  static String[] getSegments(String property) {
     if (property.startsWith(OTEL_INSTRUMENTATION_PREFIX)) {
       property = property.substring(OTEL_INSTRUMENTATION_PREFIX.length());
     }

instrumentation-api-incubator/src/test/java/io/opentelemetry/instrumentation/api/incubator/config/bridge/ConfigPropertiesUtilTest.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.api.incubator.config.bridge;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class ConfigPropertiesUtilTest {
+  @Test
+  void propertyYamlPath() {
+    assertThat(ConfigPropertiesUtil.propertyYamlPath("google.otel.auth.target.signals"))
+        .isEqualTo(
+            "'instrumentation/development' / 'java' / 'google' / 'otel' / 'auth' / 'target' / 'signals'");
+  }
+}