feat: new sample - Get Model (#124)

* feat: add new sample - Tables: Relax column query append

* nit

* update based on comments

* update exception handling

* refactor

* update base on comments

* code refactoring

* fix build errors

* add debugging statements

* remove unused exception

* feat: new sample - Models: Get a model resource

* feat: new sample - Models: Get a model resource

* fix build error

samples/src/main/java/com/example/bigquery/GetModel.java

@@ -0,0 +1,51 @@
+/*
+ * 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.bigquery;
+
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.Model;
+import com.google.cloud.bigquery.ModelId;
+
+// [START bigquery_get_model]
+public class GetModel {
+
+  public static void runGetModel() {
+    // TODO(developer): Replace these variables before running the sample.
+    String datasetName = "MY_DATASET_NAME";
+    String modelName = "MY_MODEL_ID";
+    getModel(datasetName, modelName);
+  }
+
+  public static void getModel(String datasetName, String modelName) {
+    try {
+      // Initialize client that will be used to send requests. This client only needs to be created
+      // once, and can be reused for multiple requests.
+      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
+
+      ModelId modelId = ModelId.of(datasetName, modelName);
+      Model model = bigquery.getModel(modelId);
+      System.out.println("Model: " + model.getDescription());
+
+      System.out.println("Successfully retrieved model");
+    } catch (BigQueryException e) {
+      System.out.println("Cannot retrieve model \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_get_model]

samples/src/test/java/com/example/bigquery/GetModelIT.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.bigquery;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class GetModelIT {
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");
+  private static final String BIGQUERY_MODEL_NAME = System.getenv("BIGQUERY_MODEL_NAME");
+
+  private static void requireEnvVar(String varName) {
+    assertNotNull(
+        "Environment variable " + varName + " is required to perform these tests.",
+        System.getenv(varName));
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("BIGQUERY_DATASET_NAME");
+    requireEnvVar("BIGQUERY_MODEL_NAME");
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void getModel() {
+    GetModel.getModel(BIGQUERY_DATASET_NAME, BIGQUERY_MODEL_NAME);
+    assertThat(bout.toString()).contains("Successfully retrieved model");
+  }
+}