DictionaryIO.java

/*******************************************************************************
 * Copyright (c) 2003-2005, 2013 Till Zoppke.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Till Zoppke - initial API and implementation
 ******************************************************************************/
/*
 * Created on 12.04.2004
 */
package eniac.lang;

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

import javax.swing.JOptionPane;

import eniac.Manager;
import eniac.io.IOUtil;
import eniac.io.Progressor;
import eniac.io.Proxy;
import eniac.log.Log;
import eniac.util.EProperties;
import eniac.util.Status;
import eniac.util.StringConverter;

/**
 * @author zoppke
 */
public class DictionaryIO {

	public static final String USER_LANGUAGE_SYSTEM_PROPERTY = "user.language"; //$NON-NLS-1$

	private DictionaryIO() {
		// empty
	}

	public static List<Proxy> loadProxies() {
		String path = getLanguagePathWithoutIndex();
		int max = StringConverter.toInt(EProperties.getInstance().getProperty("MAX_LANGUAGE_INDEX"));
		String text = Dictionary.DICTIONARY_SCANNING.getText();
		return IOUtil.loadProxies(path, max, text);
	}

	public static void loadLanguage(Proxy proxy) {

		// announce that we are loading a language
		Progressor.getInstance().setText(Dictionary.DICTIONARY_LOADING.getText());

		String path = proxy.getPath();
		InputStream in = Manager.getInstance().getResourceAsStream(path);
		DictionaryHandler handler = new DictionaryHandler();
		try {
			IOUtil.parse(in, handler);

			// set new language
			Status.LANGUAGE.setValue(proxy.get(Proxy.Tag.KEY));
		} catch (IOException e) {
			Log.log("Loading of language failed. Cannot change to new language", //$NON-NLS-1$
					JOptionPane.ERROR_MESSAGE, true);
			e.printStackTrace();
		}
	}

	public static void loadDefaultLanguage() {
		if (Manager.getInstance().hasIOAccess()) {
			// if we are privileged, scan for proxies and call a method,
			// that looks for the users language in the system properties.
			List<Proxy> proxies = loadProxies();
			// get user's default language.
			String locale = System.getProperty(USER_LANGUAGE_SYSTEM_PROPERTY);

			// recurse on proxies and find one that fits to the default language
			for (Proxy proxy : proxies) {
				if (proxy.get(Proxy.Tag.KEY).equals(locale)) {
					// load language and return.
					loadLanguage(proxy);
					return;
				}
			}
			// we have no language bundle for the user's default language.
			// so load default language as encoded at parameters.
		}
		// we are not privileged and so have no access to system properties.
		// so load default language as encoded by parameters.
		loadDefaultLanguageFromParameter();
	}

	private static void loadDefaultLanguageFromParameter() {
		String path = getLanguagePathWithoutIndex();
		int index = StringConverter.toInt(EProperties.getInstance().getProperty("INDEX_OF_DEFAULT_LANGUAGE"));
		String languagePath = IOUtil.addIndex(path, index);
		Proxy proxy = IOUtil.loadProxy(languagePath);
		if (proxy == null) {
			// TODO: if proxy is null, log this and return
			Log.log("proxy is null");
			// System.out.println("proxy is null");
			return;
		}
		loadLanguage(proxy);
	}

	private static String getLanguagePathWithoutIndex() {
		String folder = EProperties.getInstance().getProperty("LANGUAGE_FOLDER");
		String file = EProperties.getInstance().getProperty("LANGUAGE_FILE_WITHOUT_INDEX");
		return folder + "/" + file; //$NON-NLS-1$
	}
}