samples: translate: add v3 language samples (#1937)

Co-authored-by: Les Vogel <lesv@users.noreply.github.com>

translate/snippets/src/main/java/com/example/translate/DetectLanguage.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.translate;
+
+// [START translate_v3_detect_language]
+import com.google.cloud.translate.v3.DetectLanguageRequest;
+import com.google.cloud.translate.v3.DetectLanguageResponse;
+import com.google.cloud.translate.v3.DetectedLanguage;
+import com.google.cloud.translate.v3.LocationName;
+import com.google.cloud.translate.v3.TranslationServiceClient;
+
+import java.io.IOException;
+
+public class DetectLanguage {
+
+  public static void detectLanguage() throws IOException {
+    // TODO(developer): Replace these variables before running the sample.
+    String projectId = "YOUR-PROJECT-ID";
+    String text = "your-text";
+
+    detectLanguage(projectId, text);
+  }
+
+  // Detecting the language of a text string
+  public static void detectLanguage(String projectId, String text) throws IOException {
+
+    // Initialize client that will be used to send requests. This client only needs to be created
+    // once, and can be reused for multiple requests. After completing all of your requests, call
+    // the "close" method on the client to safely clean up any remaining background resources.
+    try (TranslationServiceClient client = TranslationServiceClient.create()) {
+      // Supported Locations: `global`, [glossary location], or [model location]
+      // Glossaries must be hosted in `us-central1`
+      // Custom Models must use the same location as your model. (us-central1)
+      LocationName parent = LocationName.of(projectId, "global");
+
+      // Supported Mime Types: https://cloud.google.com/translate/docs/supported-formats
+      DetectLanguageRequest request =
+          DetectLanguageRequest.newBuilder()
+              .setParent(parent.toString())
+              .setMimeType("text/plain")
+              .setContent(text)
+              .build();
+
+      DetectLanguageResponse response = client.detectLanguage(request);
+
+      // Display list of detected languages sorted by detection confidence.
+      // The most probable language is first.
+      for (DetectedLanguage language : response.getLanguagesList()) {
+        // The language detected
+        System.out.printf("Language code: %s\n", language.getLanguageCode());
+        // Confidence of detection result for this language
+        System.out.printf("Confidence: %s\n", language.getConfidence());
+      }
+    }
+  }
+}
+// [END translate_v3_detect_language]

translate/snippets/src/main/java/com/example/translate/GetSupportedLanguages.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.translate;
+
+// [START translate_v3_get_supported_languages]
+import com.google.cloud.translate.v3.GetSupportedLanguagesRequest;
+import com.google.cloud.translate.v3.LocationName;
+import com.google.cloud.translate.v3.SupportedLanguage;
+import com.google.cloud.translate.v3.SupportedLanguages;
+import com.google.cloud.translate.v3.TranslationServiceClient;
+
+import java.io.IOException;
+
+public class GetSupportedLanguages {
+
+  public static void getSupportedLanguages() throws IOException {
+    // TODO(developer): Replace these variables before running the sample.
+    String projectId = "YOUR-PROJECT-ID";
+    getSupportedLanguages(projectId);
+  }
+
+  // Getting a list of supported language codes
+  public static void getSupportedLanguages(String projectId) throws IOException {
+
+    // Initialize client that will be used to send requests. This client only needs to be created
+    // once, and can be reused for multiple requests. After completing all of your requests, call
+    // the "close" method on the client to safely clean up any remaining background resources.
+    try (TranslationServiceClient client = TranslationServiceClient.create()) {
+      // Supported Locations: `global`, [glossary location], or [model location]
+      // Glossaries must be hosted in `us-central1`
+      // Custom Models must use the same location as your model. (us-central1)
+      LocationName parent = LocationName.of(projectId, "global");
+      GetSupportedLanguagesRequest request =
+          GetSupportedLanguagesRequest.newBuilder().setParent(parent.toString()).build();
+
+      SupportedLanguages response = client.getSupportedLanguages(request);
+
+      // List language codes of supported languages
+      for (SupportedLanguage language : response.getLanguagesList()) {
+        System.out.printf("Language Code: %s\n", language.getLanguageCode());
+      }
+    }
+  }
+}
+// [END translate_v3_get_supported_languages]

translate/snippets/src/main/java/com/example/translate/GetSupportedLanguagesForTarget.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.translate;
+
+// [START translate_v3_get_supported_languages_for_target]
+import com.google.cloud.translate.v3.GetSupportedLanguagesRequest;
+import com.google.cloud.translate.v3.LocationName;
+import com.google.cloud.translate.v3.SupportedLanguage;
+import com.google.cloud.translate.v3.SupportedLanguages;
+import com.google.cloud.translate.v3.TranslationServiceClient;
+
+import java.io.IOException;
+
+public class GetSupportedLanguagesForTarget {
+
+  public static void getSupportedLanguagesForTarget() throws IOException {
+    // TODO(developer): Replace these variables before running the sample.
+    String projectId = "YOUR-PROJECT-ID";
+    // Supported Languages: https://cloud.google.com/translate/docs/languages
+    String languageCode = "your-language-code";
+    getSupportedLanguagesForTarget(projectId, languageCode);
+  }
+
+  // Listing supported languages with target language name
+  public static void getSupportedLanguagesForTarget(String projectId, String languageCode)
+      throws IOException {
+
+    // Initialize client that will be used to send requests. This client only needs to be created
+    // once, and can be reused for multiple requests. After completing all of your requests, call
+    // the "close" method on the client to safely clean up any remaining background resources.
+    try (TranslationServiceClient client = TranslationServiceClient.create()) {
+      // Supported Locations: `global`, [glossary location], or [model location]
+      // Glossaries must be hosted in `us-central1`
+      // Custom Models must use the same location as your model. (us-central1)
+      LocationName parent = LocationName.of(projectId, "global");
+      GetSupportedLanguagesRequest request =
+          GetSupportedLanguagesRequest.newBuilder()
+              .setParent(parent.toString())
+              .setDisplayLanguageCode(languageCode)
+              .build();
+
+      SupportedLanguages response = client.getSupportedLanguages(request);
+
+      // List language codes of supported languages
+      for (SupportedLanguage language : response.getLanguagesList()) {
+        System.out.printf("Language Code: %s\n", language.getLanguageCode());
+        System.out.printf("Display Name: %s\n", language.getDisplayName());
+      }
+    }
+  }
+}
+// [END translate_v3_get_supported_languages_for_target]

translate/snippets/src/test/java/com/example/translate/DetectLanguageTests.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.translate;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for Detect Languages sample. */
+@RunWith(JUnit4.class)
+@SuppressWarnings("checkstyle:abbreviationaswordinname")
+public class DetectLanguageTests {
+  private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
+
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static void requireEnvVar(String varName) {
+    assertNotNull(
+        "Environment variable '%s' is required to perform these tests.".format(varName),
+        System.getenv(varName));
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("GOOGLE_APPLICATION_CREDENTIALS");
+    requireEnvVar("GOOGLE_CLOUD_PROJECT");
+  }
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testDetectLanguage() throws IOException {
+    DetectLanguage.detectLanguage(PROJECT_ID, "Hæ sæta");
+    String got = bout.toString();
+    assertThat(got).contains("is");
+  }
+}

translate/snippets/src/test/java/com/example/translate/GetSupportedLanguagesForTargetTests.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.translate;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for Get Supported Languages For Target sample. */
+@RunWith(JUnit4.class)
+@SuppressWarnings("checkstyle:abbreviationaswordinname")
+public class GetSupportedLanguagesForTargetTests {
+  private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
+
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static void requireEnvVar(String varName) {
+    assertNotNull(
+        "Environment variable '%s' is required to perform these tests.".format(varName),
+        System.getenv(varName));
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("GOOGLE_APPLICATION_CREDENTIALS");
+    requireEnvVar("GOOGLE_CLOUD_PROJECT");
+  }
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testGetSupportedLanguages() throws IOException {
+    GetSupportedLanguagesForTarget.getSupportedLanguagesForTarget(PROJECT_ID, "is");
+    String got = bout.toString();
+    assertThat(got).contains("Language Code: sq");
+    assertThat(got).contains("Display Name: albanska");
+  }
+}