src/main/java/org/embulk/input/gcs/GcsFileInputPlugin.java in embulk-input-gcs-0.2.8 vs src/main/java/org/embulk/input/gcs/GcsFileInputPlugin.java in embulk-input-gcs-0.3.0

@@ -1,10 +1,8 @@
 package org.embulk.input.gcs;
 
 import com.google.api.services.storage.Storage;
-import com.google.common.base.Function;
-import com.google.common.base.Optional;
 import com.google.common.base.Throwables;
 import org.embulk.config.ConfigDiff;
 import org.embulk.config.ConfigException;
 import org.embulk.config.ConfigSource;
 import org.embulk.config.TaskReport;
@@ -16,10 +14,12 @@
 import org.slf4j.Logger;
 
 import java.io.IOException;
 import java.security.GeneralSecurityException;
 import java.util.List;
+import java.util.Optional;
+import java.util.function.Function;
 
 public class GcsFileInputPlugin
         implements FileInputPlugin
 {
     private static final Logger log = Exec.getLogger(GcsFileInputPlugin.class);
@@ -84,11 +84,11 @@
     {
         try {
             return new GcsAuthentication(
                     task.getAuthMethod().getString(),
                     task.getServiceAccountEmail(),
-                    task.getP12Keyfile().transform(localFileToPathString()),
-                    task.getJsonKeyfile().transform(localFileToPathString()),
+                    task.getP12Keyfile().map(localFileToPathString()),
+                    task.getJsonKeyfile().map(localFileToPathString()),
                     task.getApplicationName()
             );
         }
         catch (GeneralSecurityException | IOException ex) {
             throw new ConfigException(ex);