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TranslateExample.java
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TranslateExample.java
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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.google.cloud.examples.translate;
import com.google.cloud.translate.Detection;
import com.google.cloud.translate.Language;
import com.google.cloud.translate.Translate;
import com.google.cloud.translate.TranslateOptions;
import com.google.cloud.translate.Translation;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* An example of using Google Translate.
*
* <p>This example demonstrates a simple/typical Translate usage.
*
* <p>See the
* <a href="https://github.com/GoogleCloudPlatform/google-cloud-java/blob/master/google-cloud-examples/README.md">
* README</a> for compilation instructions. Run this code with
* <pre>{@code target/appassembler/bin/TranslateExample
* -Dexec.args="<apiKey> [<targetLanguage>]
* list languages <languageCode>?
* detect <text>+
* translate <text>+"}</pre>
*
* <p>The first parameter is an optional {@code targetLanguage}. If the target language is not
* supplied, {@code en} is used (see {@link TranslateOptions.Builder#targetLanguage(String)}).
*/
public class TranslateExample {
private static final Map<String, TranslateAction> ACTIONS = new HashMap<>();
private abstract static class TranslateAction<T> {
abstract void run(Translate translate, T arg) throws Exception;
abstract T parse(String... args) throws Exception;
protected String params() {
return "";
}
}
/**
* This class demonstrates how to list supported languages.
*
* @see <a href="https://cloud.google.com/translate/v2/discovering-supported-languages-with-rest">
* Discovering Supported Languages</a>
*/
private static class ListLanguagesAction extends TranslateAction<Void> {
@Override
public void run(Translate translate, Void arg) {
List<Language> languages = translate.listSupportedLanguages();
System.out.println("Supported languages:");
for (Language language : languages) {
System.out.println(language);
}
}
@Override
Void parse(String... args) throws Exception {
if (args.length == 0) {
return null;
}
throw new IllegalArgumentException("This action takes no arguments.");
}
}
/**
* This class demonstrates how detect the language of some texts.
*
* @see <a href="https://cloud.google.com/translate/v2/detecting-language-with-rest">Detecting
* Language</a>
*/
private static class DetectLanguageAction extends TranslateAction<List<String>> {
@Override
public void run(Translate translate, List<String> texts) {
List<Detection> detections = translate.detect(texts);
if (texts.size() == 1) {
System.out.println("Detected language is:");
} else {
System.out.println("Detected languages are:");
}
for (Detection detection : detections) {
System.out.println(detection);
}
}
@Override
List<String> parse(String... args) throws Exception {
if (args.length >= 1) {
return Arrays.asList(args);
} else {
throw new IllegalArgumentException("Missing required texts.");
}
}
@Override
public String params() {
return "<text>+";
}
}
/**
* This class demonstrates how to translate some texts.
*
* @see <a href="https://cloud.google.com/translate/v2/translating-text-with-rest">Translating
* Text</a>
*/
private static class TranslateTextAction extends TranslateAction<List<String>> {
@Override
public void run(Translate translate, List<String> texts) {
List<Translation> translations = translate.translate(texts);
if (texts.size() == 1) {
System.out.println("Translation is:");
} else {
System.out.println("Translations are:");
}
for (Translation translation : translations) {
System.out.println(translation);
}
}
@Override
List<String> parse(String... args) throws Exception {
if (args.length >= 1) {
return Arrays.asList(args);
} else {
throw new IllegalArgumentException("Missing required texts.");
}
}
@Override
public String params() {
return "<text>+";
}
}
static {
ACTIONS.put("languages", new ListLanguagesAction());
ACTIONS.put("detect", new DetectLanguageAction());
ACTIONS.put("translate", new TranslateTextAction());
}
private static void printUsage() {
StringBuilder actionAndParams = new StringBuilder();
for (Map.Entry<String, TranslateAction> entry : ACTIONS.entrySet()) {
actionAndParams.append(System.lineSeparator()).append('\t').append(entry.getKey());
String param = entry.getValue().params();
if (param != null && !param.isEmpty()) {
actionAndParams.append(' ').append(param);
}
}
System.out.printf("Usage: %s [<apiKey>] [<targetLanguage>] operation <args>*%s%n",
TranslateExample.class.getSimpleName(), actionAndParams);
}
@SuppressWarnings("unchecked")
public static void main(String... args) throws Exception {
if (args.length < 1) {
System.out.println("Missing required action");
printUsage();
return;
}
TranslateOptions.Builder optionsBuilder = TranslateOptions.builder();
TranslateAction action;
String actionName;
if (args.length >= 3 && !ACTIONS.containsKey(args[1])) {
optionsBuilder.apiKey(args[0]);
actionName = args[2];
optionsBuilder.targetLanguage(args[1]);
args = Arrays.copyOfRange(args, 3, args.length);
} else if (args.length >= 2 && !ACTIONS.containsKey(args[0])) {
optionsBuilder.apiKey(args[0]);
actionName = args[1];
args = Arrays.copyOfRange(args, 2, args.length);
} else {
actionName = args[0];
args = Arrays.copyOfRange(args, 1, args.length);
}
action = ACTIONS.get(actionName);
if (action == null) {
System.out.println("Unrecognized action.");
printUsage();
return;
}
Object arg;
try {
arg = action.parse(args);
} catch (IllegalArgumentException ex) {
System.out.printf("Invalid input for action '%s'. %s%n", actionName, ex.getMessage());
System.out.printf("Expected: %s%n", action.params());
return;
} catch (Exception ex) {
System.out.println("Failed to parse arguments.");
ex.printStackTrace();
return;
}
Translate translate = optionsBuilder.build().service();
action.run(translate, arg);
}
}