Remove CloudLocationUtil class

detectors/resources-support/build.gradle

@@ -24,4 +24,4 @@ afterEvaluate {
 	tasks.named("compileJava"){
 		options.release = 8
 	}
-}
+}

detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detectors/GCPMetadataConfig.java

@@ -52,8 +52,16 @@ String getProjectId() {
     return getAttribute("project/project-id");
   }
 
-  // Example response: projects/640212054955/zones/australia-southeast1-a
-  // Returns null on failure to retrieve from metadata server
+  /**
+   * Method to extract cloud availability zone from the metadata server.
+   *
+   * <p>Example response: projects/640212054955/zones/australia-southeast1-a
+   *
+   * <p>Example zone: australia-southeast1-a
+   *
+   * @return the extracted zone from the metadata server response or null in case of failure to
+   *     retrieve from metadata server.
+   */
   String getZone() {
     String zone = getAttribute("instance/zone");
     if (zone != null && zone.contains("/")) {
@@ -62,10 +70,14 @@ String getZone() {
     return zone;
   }
 
-  // Use this method only when the region cannot be parsed from the zone. Known use-cases of this
-  // method involve detecting region in GAE standard environment
-  // Example response: projects/5689182099321/regions/us-central1
-  // Returns null on failure to retrieve from metadata server
+  /**
+   * Use this method only when the region cannot be parsed from the zone. Known use-cases of this
+   * method involve detecting region in GAE standard environment.
+   *
+   * <p>Example response: projects/5689182099321/regions/us-central1.
+   *
+   * @return the retrieved region or null in case of failure to retrieve from metadata server
+   */
   String getRegion() {
     String region = getAttribute("instance/region");
     if (region != null && region.contains("/")) {
@@ -74,6 +86,27 @@ String getRegion() {
     return region;
   }
 
+  /**
+   * Use this method to parse region from zone.
+   *
+   * <p>Example region: australia-southeast1
+   *
+   * @return parsed region from the zone, if zone is not found or is invalid, this method returns
+   *     null.
+   */
+  String getRegionFromZone() {
+    String region = null;
+    String zone = getZone();
+    if (zone != null && !zone.isEmpty()) {
+      // Parsing required to scope up to a region
+      String[] splitArr = zone.split("-");
+      if (splitArr.length > 2) {
+        region = String.join("-", splitArr[0], splitArr[1]);
+      }
+    }
+    return region;
+  }
+
   // Example response: projects/640212054955/machineTypes/e2-medium
   String getMachineType() {
     String machineType = getAttribute("instance/machine-type");

detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detectors/GoogleAppEngine.java

@@ -49,19 +49,17 @@ private Map<String, Optional<String>> prepareAttributes() {
     map.put(GAE_MODULE_NAME, Optional.ofNullable(this.environmentVariables.get("GAE_SERVICE")));
     map.put(GAE_APP_VERSION, Optional.ofNullable(this.environmentVariables.get("GAE_VERSION")));
     map.put(GAE_INSTANCE_ID, Optional.ofNullable(this.environmentVariables.get("GAE_INSTANCE")));
-    map.put(
-        GAE_AVAILABILITY_ZONE,
-        CloudLocationUtil.getAvailabilityZoneFromMetadata(this.metadataConfig));
+    map.put(GAE_AVAILABILITY_ZONE, Optional.ofNullable(this.metadataConfig.getZone()));
     map.put(GAE_CLOUD_REGION, getCloudRegion());
     return Collections.unmodifiableMap(map);
   }
 
   private Optional<String> getCloudRegion() {
     if (this.environmentVariables.get("GAE_ENV") != null
         && this.environmentVariables.get("GAE_ENV").equals("standard")) {
-      return CloudLocationUtil.getCloudRegionFromMetadataUsingRegion(this.metadataConfig);
+      return Optional.ofNullable(this.metadataConfig.getRegion());
     } else {
-      return CloudLocationUtil.getCloudRegionFromMetadataUsingZone(this.metadataConfig);
+      return Optional.ofNullable(this.metadataConfig.getRegionFromZone());
     }
   }
 

detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detectors/GoogleComputeEngine.java

@@ -46,12 +46,8 @@ final class GoogleComputeEngine implements DetectedPlatform {
   private Map<String, Optional<String>> prepareAttributes() {
     Map<String, Optional<String>> map = new HashMap<>();
     map.put(GCE_PROJECT_ID, Optional.ofNullable(this.metadataConfig.getProjectId()));
-    map.put(
-        GCE_AVAILABILITY_ZONE,
-        CloudLocationUtil.getAvailabilityZoneFromMetadata(this.metadataConfig));
-    map.put(
-        GCE_CLOUD_REGION,
-        CloudLocationUtil.getCloudRegionFromMetadataUsingZone(this.metadataConfig));
+    map.put(GCE_AVAILABILITY_ZONE, Optional.ofNullable(this.metadataConfig.getRegionFromZone()));
+    map.put(GCE_CLOUD_REGION, Optional.ofNullable(this.metadataConfig.getRegionFromZone()));
     map.put(GCE_INSTANCE_ID, Optional.ofNullable(this.metadataConfig.getInstanceId()));
     map.put(GCE_INSTANCE_NAME, Optional.ofNullable(this.metadataConfig.getInstanceName()));
     map.put(GCE_MACHINE_TYPE, Optional.ofNullable(this.metadataConfig.getMachineType()));

detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detectors/GoogleServerlessCompute.java

@@ -52,10 +52,10 @@ private Map<String, Optional<String>> prepareAttributes() {
         Optional.ofNullable(this.environmentVariables.get("K_REVISION")));
     map.put(
         AttributeKeys.SERVERLESS_COMPUTE_AVAILABILITY_ZONE,
-        CloudLocationUtil.getAvailabilityZoneFromMetadata(this.metadataConfig));
+        Optional.ofNullable(this.metadataConfig.getZone()));
     map.put(
         AttributeKeys.SERVERLESS_COMPUTE_CLOUD_REGION,
-        CloudLocationUtil.getCloudRegionFromMetadataUsingZone(this.metadataConfig));
+        Optional.ofNullable(this.metadataConfig.getRegionFromZone()));
     map.put(
         AttributeKeys.SERVERLESS_COMPUTE_INSTANCE_ID,
         Optional.ofNullable(this.metadataConfig.getInstanceId()));