docs(samples): add create ad manager transfer config

samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateAdManagerTransfer.java

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+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.bigquerydatatransfer;
+
+// [START bigquerydatatransfer_create_admanager_transfer]
+import com.google.api.gax.rpc.ApiException;
+import com.google.cloud.bigquery.datatransfer.v1.CreateTransferConfigRequest;
+import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
+import com.google.cloud.bigquery.datatransfer.v1.ProjectName;
+import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+// Sample to create a ad manager(formerly DFP) transfer config
+public class CreateAdManagerTransfer {
+
+  public static void main(String[] args) throws IOException {
+    // TODO(developer): Replace these variables before running the sample.
+    final String projectId = "MY_PROJECT_ID";
+    String datasetId = "MY_DATASET_ID";
+    String bucket = "gs://cloud-sample-data";
+    String networkCode = "MY_NETWORK_CODE";
+    Map<String, Value> params = new HashMap<>();
+    params.put("bucket", Value.newBuilder().setStringValue(bucket).build());
+    params.put("network_code", Value.newBuilder().setStringValue(networkCode).build());
+    TransferConfig transferConfig =
+        TransferConfig.newBuilder()
+            .setDestinationDatasetId(datasetId)
+            .setDisplayName("Your Ad Manager Config Name")
+            .setDataSourceId("dfp_dt")
+            .setParams(Struct.newBuilder().putAllFields(params).build())
+            .setSchedule("every 24 hours")
+            .build();
+    createAdManagerTransfer(projectId, transferConfig);
+  }
+
+  public static void createAdManagerTransfer(String projectId, TransferConfig transferConfig)
+      throws IOException {
+    try (DataTransferServiceClient client = DataTransferServiceClient.create()) {
+      ProjectName parent = ProjectName.of(projectId);
+      CreateTransferConfigRequest request =
+          CreateTransferConfigRequest.newBuilder()
+              .setParent(parent.toString())
+              .setTransferConfig(transferConfig)
+              .build();
+      TransferConfig config = client.createTransferConfig(request);
+      System.out.println("Ad manager transfer created successfully :" + config.getName());
+    } catch (ApiException ex) {
+      System.out.print("Ad manager transfer was not created." + ex.toString());
+    }
+  }
+}
+// [END bigquerydatatransfer_create_admanager_transfer]