package studio.beansoft.util;

import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.Map;

/**
 * A ResLoader is a tool that allow you load a resouce bundle
 * and return the formated message from given argument.
 *
 * Samle usage:
 * // There should be a file named com/beansoft/resources.properties
 * ResLoader res = ResLoader.getResource("com.beansoft.resources");
 * System.out.println(res.getText("frame title"));
 * System.out.println(res.getText("can't open {0}", "file.txt"));
 */
public class ResLoader
{
    private ResourceBundle messageRB;

    /**
     * Holds a cached list of loaded resouces.
     */
    private static Map resources = new java.util.HashMap();

    public ResLoader() {
    }
    
    public ResLoader(String resourceName) {
    	loadResource(resourceName);
    }

    public void loadResource(String resourceName)
    {
        try
        {
            messageRB = ResourceBundle.getBundle(resourceName);
        }
        catch(MissingResourceException missingresourceexception)
        {
            throw new Error("Fatal: Resource " + resourceName + " is missing");
        }
    }

    /**
     * Returs a resource bundle of this class.
     * @param resourceName
     * @return a ResLoader fetched from the cache
     */
    public static ResLoader getResource(String resourceName) {
        if(resources.get(resourceName) == null) {
          resources.put(resourceName, new ResLoader(resourceName));
        }

    	return (ResLoader)resources.get(resourceName);
    }

    /**
     * Read text from the res bundle.
     * @param key
     * @return string
     */
    public String getText(String key)
    {
        return getText(key, (String)null);
    }

    public String getText(String key, String argument1)
    {
        return getText(key, argument1, null);
    }

    public String getText(String key, String argument1, String argument2)
    {
        return getText(key, argument1, argument2, null);
    }

    public String getText(String key, String argument1, String argument2, String argument3)
    {
        String as[] = new String[3];
        as[0] = argument1;
        as[1] = argument2;
        as[2] = argument3;
        return getText(key, as);
    }
    
    // Support any numbers arguments
    public String getText(String key, String[] arguments)
    {
        if(messageRB == null)
            return null;
        try
        {
            String message = messageRB.getString(key);
            return MessageFormat.format(message, arguments);
        }
        catch(MissingResourceException missingresourceexception)
        {
        	return null;
        }
    }

}