messagetag.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/com/esimple/framework/web/taglib/bean/MessageTag.java,v 1.1.1.1 2004/09/08 06:38:14 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:14 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Struts", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */


package com.esimple.framework.web.taglib.bean;


import java.util.Locale;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.struts.Globals;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;


/**
 * Custom tag that retrieves an internationalized messages string (with
 * optional parametric replacement) from the <code>ActionResources</code>
 * object stored as a context attribute by our associated
 * <code>ActionServlet</code> implementation.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:14 $
 */

public class MessageTag extends TagSupport {


    // ------------------------------------------------------------- Properties


    /**
     * The first optional argument.
     */
    protected String arg0 = null;

    public String getArg0() {
	return (this.arg0);
    }

    public void setArg0(String arg0) {
	this.arg0 = arg0;
    }


    /**
     * The second optional argument.
     */
    protected String arg1 = null;

    public String getArg1() {
	return (this.arg1);
    }

    public void setArg1(String arg1) {
	this.arg1 = arg1;
    }


    /**
     * The third optional argument.
     */
    protected String arg2 = null;

    public String getArg2() {
	return (this.arg2);
    }

    public void setArg2(String arg2) {
	this.arg2 = arg2;
    }


    /**
     * The fourth optional argument.
     */
    protected String arg3 = null;

    public String getArg3() {
	return (this.arg3);
    }

    public void setArg3(String arg3) {
	this.arg3 = arg3;
    }


    /**
     * The fifth optional argument.
     */
    protected String arg4 = null;

    public String getArg4() {
	return (this.arg4);
    }

    public void setArg4(String arg4) {
	this.arg4 = arg4;
    }


    /**
     * The servlet context attribute key for our resources.
     */
    protected String bundle = null;

    public String getBundle() {
	return (this.bundle);
    }

    public void setBundle(String bundle) {
	this.bundle = bundle;
    }


    /**
     * The default Locale for our server.
     */
    protected static final Locale defaultLocale = Locale.getDefault();


    /**
     * The message key of the message to be retrieved.
     */
    protected String key = null;

    public String getKey() {
	return (this.key);
    }

    public void setKey(String key) {
	this.key = key;
    }


    /**
     * Name of the bean that contains the message key.
     */
    protected String name = null;

    public String getName() {
        return (this.name);
    }

    public void setName(String name) {
        this.name = name;
    }


    /**
     * Name of the property to be accessed on the specified bean.
     */
    protected String property = null;

    public String getProperty() {
        return (this.property);
    }

    public void setProperty(String property) {
        this.property = property;
    }


    /**
     * The scope to be searched to retrieve the specified bean.
     */
    protected String scope = null;

    public String getScope() {
        return (this.scope);
    }

    public void setScope(String scope) {
        this.scope = scope;
    }


    /**
     * The session scope key under which our Locale is stored.
     */
    protected String localeKey = Globals.LOCALE_KEY;

    public String getLocale() {
	return (this.localeKey);
    }

    public void setLocale(String localeKey) {
	this.localeKey = localeKey;
    }


    /**
     * The message resources for this package.
     */
    protected static MessageResources messages =
	MessageResources.getMessageResources
	("org.apache.struts.taglib.bean.LocalStrings");


    // --------------------------------------------------------- Public Methods


    /**
     * Process the start tag.
     *
     * @exception JspException if a JSP exception has occurred
     */
    public int doStartTag() throws JspException {

        String key = this.key;
        if (key == null) {
            // Look up the requested property value
            Object value =
                RequestUtils.lookup(pageContext, name, property, scope);
            if (value != null && !(value instanceof String)) {
                JspException e = new JspException
                    (messages.getMessage("message.property", key));
                RequestUtils.saveException(pageContext, e);
                throw e;
            }
            key = (String)value;
        }

	// Construct the optional arguments array we will be using
	Object args[] = new Object[5];
	args[0] = arg0;
	args[1] = arg1;
	args[2] = arg2;
	args[3] = arg3;
	args[4] = arg4;

	// Retrieve the message string we are looking for
	String message = RequestUtils.message(pageContext, this.bundle,
                                              this.localeKey, key, args);
	if (message == null) {
//	    JspException e = new JspException
//		(messages.getMessage("message.message", "\"" + key + "\""));
//            RequestUtils.saveException(pageContext, e);
//            throw e;
		message = key ;
        }

	// Print the retrieved message to our output writer
        ResponseUtils.write(pageContext, message);

	// Continue processing this page
	return (SKIP_BODY);

    }


    /**
     * Release any acquired resources.
     */
    public void release() {

	super.release();
	arg0 = null;
	arg1 = null;
	arg2 = null;
	arg3 = null;
	arg4 = null;
	bundle = Globals.MESSAGES_KEY;
	key = null;
	name = null;
	property = null;
	scope = null;
	localeKey = Globals.LOCALE_KEY;

    }


}