org.sleeksnap.impl.Language.java Source code

Introduction

Here is the source code for org.sleeksnap.impl.Language.java

Source

/**
 * Sleeksnap, the open source cross-platform screenshot uploader
 * Copyright (C) 2012 Nikki <nikki@nikkii.us>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.sleeksnap.impl;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.json.JSONObject;
import org.json.JSONTokener;
import org.sleeksnap.util.Util;

/**
 * A basic multi language implementation using JSON files
 * 
 * @author Nikki
 * 
 */
public class Language {

    /**
     * Tokens in the current loaded language set
     */
    private static Map<String, String> tokens = new HashMap<String, String>();

    /**
     * Pattern to match variables with
     */
    private static final Pattern VAR_PATTERN = Pattern.compile("\\{(\\d+)\\}");

    /**
     * Get a language string
     * 
     * @param token
     *            The language token name
     * @param args
     *            The language arguments
     * @return The parsed language string, or "" if null
     */
    public static String getString(final String token, final Object... args) {
        String str = tokens.get(token);

        if (str == null) {
            return "";
        }

        if (str.indexOf('{') != -1) {
            final Matcher m = VAR_PATTERN.matcher(str);

            final StringBuffer out = new StringBuffer();
            while (m.find()) {
                final int paramIndex = Integer.parseInt(m.group(1));
                if (args.length > paramIndex - 1) {
                    m.appendReplacement(out, args[paramIndex - 1].toString());
                }
            }
            m.appendTail(out);

            str = out.toString();
        }
        return str;
    }

    /**
     * Load a language after loading the default 'english' language to prevent
     * missing phrases.
     * 
     * @param lang
     *            The language name to load
     * @throws IOException
     *             If an error occurs while loading
     */
    public static void load(final String lang) throws IOException {
        tokens.clear();

        loadAndMerge("english");
        if (!lang.equals("english")) {
            loadAndMerge(lang);
        }
    }

    /**
     * Load and merge the tokens from a language
     * 
     * @param lang
     *            The language to load
     * @throws IOException
     *             If an error occurs, or if it's an invalid language file
     */
    @SuppressWarnings("unchecked")
    public static void loadAndMerge(final String lang) throws IOException {
        final URL url = Util.getResourceByName("/languages/" + lang + ".json");
        if (url != null) {
            final InputStream input = url.openStream();
            try {
                final JSONObject obj = new JSONObject(new JSONTokener(input));

                final JSONObject tokenObj = obj.getJSONObject("tokens");

                for (final String s : (Set<String>) tokenObj.keySet()) {
                    tokens.put(s, tokenObj.getString(s));
                }
            } finally {
                input.close();
            }
        } else {
            throw new IOException("Invalid language " + lang);
        }
    }
}