com.adobe.translation.google.impl.TranslationServiceImpl.java Source code

Introduction

Here is the source code for com.adobe.translation.google.impl.TranslationServiceImpl.java

Source

/*
 *   Copyright 2013 Adobe
 *
 *   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.adobe.translation.google.impl;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpConnectionManager;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.commons.json.JSONArray;
import org.apache.sling.commons.json.JSONException;
import org.apache.sling.commons.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.adobe.translation.google.TranslationService;
import com.adobe.translation.google.Translator;

/**
 * <code>TranslatorServiceImpl</code>...
 */
@Component()
@Service(value = TranslationService.class)
public class TranslationServiceImpl implements TranslationService {

    /**
     * default logger
     */
    private static final Logger log = LoggerFactory.getLogger(TranslationServiceImpl.class);

    private static final String GOOGLE_API_V2_URI = "https://www.googleapis.com/language/translate/v2";

    private HttpClient httpClient;

    private MultiThreadedHttpConnectionManager cxMgr;

    // TODO: make configurable
    private final String key = "AIzaSyD726A86aO5bgu2W6Z8YJ603Xaf6dz5Xr8";

    @Activate
    protected void activate() {
        cxMgr = new MultiThreadedHttpConnectionManager();
        httpClient = new HttpClient(cxMgr);
    }

    @Deactivate
    protected void deactivate() {
        if (cxMgr != null) {
            cxMgr.shutdown();
            cxMgr = null;
        }
        httpClient = null;
    }

    public Translator getTranslator(String srcLanguage, String dstLanguage) {
        return new TranslatorImpl(this, srcLanguage, dstLanguage);
    }

    public String translate(String text, String src, String dst) {
        GetMethod get = new GetMethod(GOOGLE_API_V2_URI);
        List<NameValuePair> query = new LinkedList<NameValuePair>();
        query.add(new NameValuePair("key", key));
        if (src != null && src.length() > 0) {
            query.add(new NameValuePair("source", src));
        }
        query.add(new NameValuePair("target", dst));
        query.add(new NameValuePair("q", text));
        get.setQueryString(query.toArray(new NameValuePair[query.size()]));
        try {
            int code = httpClient.executeMethod(get);
            if (code != 200) {
                log.error("Unable to translate text. Server responded {}.", code);
                log.error("Response body: {}", get.getResponseBodyAsString());
            } else {
                // we just concatenate the texts
                StringBuilder ret = new StringBuilder();
                JSONObject json = new JSONObject(get.getResponseBodyAsString());
                JSONObject data = json.getJSONObject("data");
                JSONArray translations = data.getJSONArray("translations");
                for (int i = 0; i < translations.length(); i++) {
                    JSONObject translation = translations.getJSONObject(i);
                    ret.append(translation.getString("translatedText"));
                }
                return ret.toString();
            }
        } catch (HttpException e) {
            log.error("Error while translating.", e);
        } catch (JSONException e) {
            log.error("Error while translating.", e);
        } catch (IOException e) {
            log.error("Error while translating.", e);
        } finally {
            get.releaseConnection();
        }
        return "";
    }
}