Internationalization

The idea is add in database some records like

INSERT INTO OKM_TRANSLATION (TR_MODULE, TR_KEY, TR_TEXT, TR_LANGUAGE) VALUES ('extension', 'new_extension.button.add', 'Add', 'en-GB');
INSERT INTO OKM_TRANSLATION (TR_MODULE, TR_KEY, TR_TEXT, TR_LANGUAGE) VALUES ('extension', 'new_extension.button.add', 'Añadir', 'es-ES');

And then call in source code with

GeneralComunicator.i18nExtension("new_extension.button.add");

or you can use some of OpenKM frontend translations with

GeneralComunicator.i18n("button.close");

OpenKM 4.x and older

It's good idea centralizing Internationalization in a single class package for all OpenKM extensions.

For example if you want to make internationalization for english and spanish you migh create two classes Lang_en_GB.java and Lang_es_ES.java

package com.openkm.extension.frontend.client.lang;

import java.util.HashMap;

public class Lang_en_GB {
	public final static HashMap<String, String> lang;
	static {
		lang = new HashMap<String, String>();

		// Download button
		lang.put("download.button.tittle", "Download document");	    
	}
}

package com.openkm.extension.frontend.client.lang;

import java.util.HashMap;

public class Lang_es_ES {
	public final static HashMap<String, String> lang;
	static {
		lang = new HashMap<String, String>();

		// Download button
		lang.put("download.button.tittle", "Descargar documento");
	}
}

And has a main Lang.java class to get language mapping translations

package com.openkm.extension.frontend.client.lang;

import java.util.HashMap;

public class Lang {
	// Languages
	public static final String LANG_es_ES = "es-ES"; 
	public static final String LANG_en_GB = "en-GB";

	public static HashMap<String, String> getLang(String lang) {
		HashMap<String, String> hLang = new HashMap<String, String>();
		
		if (LANG_es_ES.equalsIgnoreCase(lang) || LANG_es_ES.substring(0, 2).equalsIgnoreCase(lang.substring(0, 2)))  {
			hLang = Lang_es_ES.lang;
		} else if (LANG_en_GB.equalsIgnoreCase(lang) || LANG_en_GB.substring(0, 2).equalsIgnoreCase(lang.substring(0, 2)))  {
			hLang = Lang_en_GB.lang;
		} else {
			hLang = Lang_en_GB.lang;
		}
		
		return hLang;
	}
}

As you can see in Lang.java the variables LANG_es_ES and LANG_en_GB refers to "es-ES" and "en-GB". When in your extensions makes a call to GeneralComunicator.getLang() to get language it returns a String with that format "language-Country".

Here there's some example how you could use it in your extensions:

	String lang = GeneralComunicator.getLang();
	String translation = Lang.getLang(lang).get("download.button.tittle")

Remember any extension internationalized must implements LanguageHandlerExtension, for example:

private class ToolBarButton extends ToolBarButtonExtension implements LanguageHandlerExtension {
	public ToolBarButton(Image image, String title, ClickHandler handler) {
		super(image, title, handler);
	}

	@Override
	public void checkPermissions(GWTFolder folder, GWTFolder folderParent, int originPanel) {
		// TODO
	}

	@Override
	public void checkPermissions(GWTDocument doc, GWTFolder folder) {
		// TODO
	}

	@Override
	public void checkPermissions(GWTMail mail, GWTFolder folder) {
		// TODO
	}

	@Override
	public void enable(boolean enable) {
		// TODO
	}

	@Override
	public boolean isEnabled() {
		return true;
	}

	@Override
	public void onChange(LanguageEventConstant event) {
		if (event.equals(HasLanguageEvent.LANGUAGE_CHANGED)) {
			String lang = GeneralComunicator.getLang();
			setTitle(Lang.getLang(lang).get("download.button.tittle"));
		}
	}
}