com.jgaap.backend.Languages.java Source code

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Here is the source code for com.jgaap.backend.Languages.java

Source

/*
 * JGAAP -- a graphical program for stylometric authorship attribution
 * Copyright (C) 2009,2011 by Patrick Juola
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.jgaap.backend;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.jgaap.generics.Language;

/**
 * 
 * Instances new Language based on display name.
 *
 * @author Michael Ryan
 * @since 5.0.0
 */

public class Languages {

    private static ImmutableList<Language> LANGUAGES = loadLanguages();
    private static final Map<String, Language> languages = loadLanguagesMap();

    /**
     * A read-only list of the Languages
     */
    public static List<Language> getLanguages() {
        return LANGUAGES;
    }

    private static ImmutableList<Language> loadLanguages() {
        List<Object> objects = AutoPopulate.findObjects("com.jgaap.languages", Language.class);
        for (Object tmp : AutoPopulate.findClasses("com.jgaap.generics", Language.class)) {
            objects.add(tmp);
        }
        List<Language> languages = new ArrayList<Language>(objects.size());
        for (Object tmp : objects) {
            languages.add((Language) tmp);
        }
        Collections.sort(languages);
        return ImmutableList.copyOf(languages);
    }

    private static Map<String, Language> loadLanguagesMap() {
        // Load the classifiers dynamically
        ImmutableMap.Builder<String, Language> builder = ImmutableMap.builder();
        for (Language language : LANGUAGES) {
            builder.put(language.displayName().toLowerCase().trim(), language);
        }
        return builder.build();
    }

    public static Language getLanguage(String action) throws Exception {
        Language language;
        action = action.toLowerCase().trim();
        if (languages.containsKey(action)) {
            language = languages.get(action).getClass().newInstance();
        } else {
            throw new Exception("Language " + action + " was not found!");
        }
        return language;
    }
}