MessageTag.java

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/*
 * MessageTag.java
 *
 * Created on May 21, 2002, 5:17 PM
 */

package samples.i18n.simple.i18ntag;

import java.io.*;
import java.util.*;
import javax.servlet.jsp.*;
import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.jsp.tagext.*;

/**
 * A simple message taghandler to display localized message from a resource bundle based on jsp request
 * @author  Chand Basha
 * @version	1.0
 */

public class MessageTag extends TagSupport {

    private String key			= null;
	private String bundleName	= null;
	private String language		= null;
    private String country		= null;
    private String variant		= null;

	/**
	 * Set the user preferred language
	 */
	public void setLanguage(String lang) {
        this.language = lang;
	}

    /**
	 * Get the user preferred language
	 */
	public String getLanguage() {
		return language;
	}

	/**
	 * Set the user preferred country
	 */
	public void setCountry(String country) {
		this.country = country;
	}

    /**
	 * Get the user preferred country
	 */
	public String getCountry() {
		return country;
    }

    /**
	 * Set the user preferred variant
	 */
    public void setVariant(String variant) {
	    this.variant = variant;
	}

    /**
	 * Get the user preferred variant
	 */
	public String getVariant() {
	    return variant;
    }

    /**
	 * Set the user preferred resource bundle name
	 */
	public void setName (String name) {
		this.bundleName = name;
	}

    /**
	 * Set the message key required to retrieve message from the resource bundle
	 */
    public void setKey(String key) {
        this.key = key;
    }

    /**
	 * Get the message key required to retrieve message from the resource bundle
	 */
    public String getKey() {
        return key;
    }

    /**
	 * Gets the user preferred resource bundle name
	 */
	public String getName() {
		return bundleName;
	}

    /**
	 * Will be called by the JSP Engine when it encounters the start of the tag
	 */
    public int doStartTag() throws JspTagException {
        return EVAL_BODY_INCLUDE;
    }

    /**
	 * Will be called by the JSP Engine when it encounters the end of the tag
	 */
    public int doEndTag() throws JspTagException {
        try {
			if(language != null) {
				if( country == null)
					country = "";
				if(variant == null)
					variant = "";
			} else language = "en";
			java.util.Locale locale = new Locale(language, country, variant);
			ResourceBundle bundle = ResourceBundle.getBundle(bundleName, locale);
			String message = bundle.getString(key);
			pageContext.getOut().write("Message from resource bundle:" + message);
		} catch(Exception e) {
            throw new JspTagException("Error: " + e);
        }
        return EVAL_PAGE;
    }
}