/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tika.language.translate;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Properties;
import java.util.logging.Logger;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.apache.cxf.jaxrs.client.WebClient;
import org.apache.tika.language.LanguageIdentifier;
import org.apache.tika.language.LanguageProfile;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* An implementation of a REST client to the <a
* href="https://www.googleapis.com/language/translate/v2">Google Translate v2
* API</a>. Based on the <a
* href="http://hayageek.com/google-translate-api-tutorial/">great tutorial</a>
* from <a href="http://hayageek.com">hayageek.com</a>. Set your API key in
* translator.google.properties.
*
*
*/
public class GoogleTranslator implements Translator {
private static final String GOOGLE_TRANSLATE_URL_BASE = "https://www.googleapis.com/language/translate/v2";
private static final String DEFAULT_KEY = "dummy-secret";
private static final Logger LOG = Logger.getLogger(GoogleTranslator.class
.getName());
private WebClient client;
private String apiKey;
private boolean isAvailable;
public GoogleTranslator() {
this.client = WebClient.create(GOOGLE_TRANSLATE_URL_BASE);
this.isAvailable = true;
Properties config = new Properties();
try {
config.load(GoogleTranslator.class
.getClassLoader()
.getResourceAsStream(
"org/apache/tika/language/translate/translator.google.properties"));
this.apiKey = config.getProperty("translator.client-secret");
if (this.apiKey.equals(DEFAULT_KEY))
this.isAvailable = false;
} catch (Exception e) {
e.printStackTrace();
isAvailable = false;
}
}
@Override
public String translate(String text, String sourceLanguage,
String targetLanguage) throws Exception {
if (!this.isAvailable)
return text;
Response response = client.accept(MediaType.APPLICATION_JSON)
.query("key", apiKey).query("source", sourceLanguage)
.query("target", targetLanguage).query("q", text).get();
BufferedReader reader = new BufferedReader(new InputStreamReader(
(InputStream) response.getEntity(), "UTF-8"));
String line = null;
StringBuffer responseText = new StringBuffer();
while ((line = reader.readLine()) != null) {
responseText.append(line);
}
ObjectMapper mapper = new ObjectMapper();
JsonNode jsonResp = mapper.readTree(responseText.toString());
return jsonResp.findValuesAsText("translatedText").get(0);
}
@Override
public String translate(String text, String targetLanguage)
throws Exception {
if (!this.isAvailable)
return text;
LanguageIdentifier language = new LanguageIdentifier(
new LanguageProfile(text));
String sourceLanguage = language.getLanguage();
return translate(text, sourceLanguage, targetLanguage);
}
@Override
public boolean isAvailable() {
return this.isAvailable;
}
}