samples: set agent code sample (#660)

* samples: set agent code sample

* Lint fix

* Update samples/snippets/src/test/java/com/example/dialogflow/SetAgentIT.java

Co-authored-by: Jeff Ching <chingor@google.com>

* Update samples/snippets/src/main/java/com/example/dialogflow/SetAgent.java

Co-authored-by: Jeff Ching <chingor@google.com>

* Update samples/snippets/src/main/java/com/example/dialogflow/SetAgent.java

Co-authored-by: Jeff Ching <chingor@google.com>

* Update samples/snippets/src/main/java/com/example/dialogflow/SetAgent.java

Co-authored-by: Jeff Ching <chingor@google.com>

* updated tests

* Test and lint fix

* Lint fix

* Changed package name

* revised code

Co-authored-by: Jeff Ching <chingor@google.com>

dialogflow/snippets/src/main/dialogflow/SetAgent.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2021 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 dialogflow;
+
+// [START dialogflow_es_create_agent]
+
+import com.google.cloud.dialogflow.v2.Agent;
+import com.google.cloud.dialogflow.v2.Agent.Builder;
+import com.google.cloud.dialogflow.v2.AgentsClient;
+import com.google.cloud.dialogflow.v2.AgentsSettings;
+import java.io.IOException;
+
+public class SetAgent {
+
+  public static void main(String[] args) throws IOException {
+    String projectId = "my-project-id";
+
+    // The display name will set the name of your agent
+    String displayName = "my-display-name";
+
+    setAgent(projectId, displayName);
+  }
+
+  public static Agent setAgent(String parent, String displayName) throws IOException {
+
+    AgentsSettings agentsSettings = AgentsSettings.newBuilder().build();
+    try (AgentsClient client = AgentsClient.create(agentsSettings)) {
+      // Set the details of the Agent to create
+      Builder build = Agent.newBuilder();
+
+      build.setDefaultLanguageCode("en");
+      build.setDisplayName(displayName);
+
+      Agent agent = build.build();
+
+      // Make API request to create agent
+      Agent response = client.setAgent(agent);
+      System.out.println(response);
+      return response;
+    }
+  }
+}
+// [END dialogflow_es_create_agent]

dialogflow/snippets/src/test/dialogflow/SetAgentIT.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2021 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 dialogflow;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SetAgentIT {
+
+
+  /*
+  * We cannot test setAgent because Dialogflow ES can only have one agent 
+  * and if we create a agent it will delete the exisitng testing agent and 
+  * would cause all tests to fail
+  */
+  @Test
+  public void testCreateAgent()  {
+    Assert.assertTrue(true);
+}