Add GCS sample: get bucket lifecycle

Author: Jerjou Cheng

google-cloud-examples/src/main/java/com/google/cloud/examples/storage/snippets/StorageSnippets.java

@@ -145,6 +145,18 @@ public Bucket enableBucketLifecycleManagement(String bucketName) {
     return bucket;
   }
 
+  /**
+   * Example of getting lifecycle management rules on a bucket.
+   */
+  // [TARGET update(BucketInfo, BucketTargetOption...)]
+  // [VARIABLE "my_unique_bucket"]
+  public List<? extends BucketInfo.DeleteRule> getBucketLifecycleManagement(String bucketName) {
+    // [START storageGetLifecycleManagement]
+    Bucket bucket = storage.get(bucketName, BucketGetOption.fields(BucketField.LIFECYCLE));
+    return bucket.getDeleteRules();
+    // [END storageGetLifecycleManagement]
+  }
+
   /**
    * Example of disabling lifecycle management rules on a bucket.
    */

google-cloud-examples/src/test/java/com/google/cloud/examples/storage/snippets/ITStorageSnippets.java

@@ -130,9 +130,15 @@ public void testEnableDisableBucketLifecycleManagement() {
     assertEquals(BucketInfo.DeleteRule.Type.AGE, deleteRules.get(0).getType());
     assertEquals(BucketInfo.DeleteRule.Type.NUM_NEWER_VERSIONS, deleteRules.get(1).getType());
 
+    deleteRules = storageSnippets.getBucketLifecycleManagement(BUCKET);
+    assertEquals(2, deleteRules.size());
+
     bucket = storageSnippets.disableBucketLifecycleManagement(BUCKET);
     deleteRules = bucket.getDeleteRules();
-    assertEquals(null, deleteRules);
+    assertNull(deleteRules);
+
+    deleteRules = storageSnippets.getBucketLifecycleManagement(BUCKET);
+    assertNull(deleteRules);
   }
 
   @Test