org.cogroo.config.LanguageConfigurationUtil.java Source code

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Here is the source code for org.cogroo.config.LanguageConfigurationUtil.java

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/**
 * Copyright (C) 2012 cogroo <cogroo@cogroo.org>
 *
 * 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 org.cogroo.config;

import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Locale;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

import org.cogroo.analyzer.InitializationException;
import org.cogroo.config.LanguageConfiguration;
import org.cogroo.config.ObjectFactory;

import com.google.common.io.Closeables;

/**
 * The <code>LanguageConfigurationUtil</code> class is responsible for
 * identifying the language to be used.
 * 
 */
public class LanguageConfigurationUtil {

    /**
     * 
     * @param locale
     *          contains the language to be used
     * @throws InitializationException
     * @return the file .xml converted to Java, it contains which analyzers to add
     *         into the pipe according to the language to be used
     */
    public static LanguageConfiguration get(Locale locale) {

        String file = generateName(locale);

        InputStream in = LanguageConfigurationUtil.class.getClassLoader().getResourceAsStream(file);

        if (in != null) {
            LanguageConfiguration lc = get(in);
            Closeables.closeQuietly(in);
            return lc;
        } else
            throw new InitializationException(
                    "Couldn't locate configuration for locale: " + locale + " The expected file was: " + file);
    }

    /**
     * Creates a {@link LanguageConfiguration} from a {@link InputStream}, which
     * remains opened.
     * 
     * @param configuration
     *          the input stream
     * @return a {@link LanguageConfiguration}
     */
    public static LanguageConfiguration get(InputStream configuration) {
        try {
            return unmarshal(configuration);
        } catch (JAXBException e) {
            throw new InitializationException("Invalid configuration file.", e);
        }
    }

    /**
     * Generates the name of the file to be used according to the language chosen.
     * 
     * @param locale
     *          contains the language that will be used
     * @return the <code>String</code> which names the .xml file to be used
     *         according to the language
     */
    private static String generateName(Locale locale) {
        StringBuilder str = new StringBuilder();
        str.append("models_").append(locale.getLanguage());

        if (locale.getCountry() != null && !locale.getCountry().isEmpty())
            str.append("_").append(locale.getCountry());

        str.append(".xml");

        return str.toString();
    }

    private static LanguageConfiguration unmarshal(InputStream inputStream) throws JAXBException {
        String packageName = LanguageConfiguration.class.getPackage().getName();
        ClassLoader cl = ObjectFactory.class.getClassLoader();
        JAXBContext jc = JAXBContext.newInstance(packageName, cl);
        Unmarshaller u = jc.createUnmarshaller();
        return (LanguageConfiguration) u.unmarshal(inputStream);
    }

    public static void main(String[] args) throws FileNotFoundException, JAXBException {
        LanguageConfiguration lc = LanguageConfigurationUtil.get(new Locale("pt_BR"));

        System.out.println(lc.getLocale());

        System.out.println(lc.getModel().get(0).getType());
        System.out.println(lc.getModel().get(0).getValue());

        System.out.println(lc.getModel().get(1).getType());
        System.out.println(lc.getModel().get(1).getValue());
    }
}