lastvisittag.java

来自「jGossip是一个简单而功能强大的Java论坛软件（消息板）」· Java 代码 · 共 172 行

/*
 * $$Id: LastVisitTag.java,v 1.11 2004/05/24 04:39:18 alexnet Exp $$
 *
 * ***** BEGIN LICENSE BLOCK *****
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License
 * at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and
 * limitations under the License.
 *
 * The Original Code is JGossip forum code.
 *
 * The Initial Developer of the Original Code is the JResearch, Org.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *              Dmitry Belov <[e-mail]>
 *
 * ***** END LICENSE BLOCK ***** */
/*
 * Created on 11.06.2003
 *
 */
package org.jresearch.gossip.tags;

import java.util.Date;
import java.util.HashMap;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.jresearch.gossip.IConst;
import org.jresearch.gossip.beans.user.User;


/**
 * DOCUMENT ME!
 *
 * @author Bel
 */
public class LastVisitTag extends TagSupport {

	/**
	 * Logger instance.
	 */
	private static final Log LOG = LogFactory.getLog(LastVisitTag.class);

    private String intime;
    private Date inTime;
    private String tid;
    private String sender;

    /**
     * DOCUMENT ME!
     *
     * @throws JspException DOCUMENT ME!
     */
    private void eval() throws JspException {
        inTime = (Date) ExpressionEvaluatorManager.evaluate("intime", intime,
                Date.class, this, pageContext);

        sender = (String) ExpressionEvaluatorManager.evaluate("sender", sender,
                String.class, this, pageContext);

        tid = ExpressionEvaluatorManager.evaluate("tid", tid, Integer.class,
                this, pageContext).toString();
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     *
     * @throws JspException DOCUMENT ME!
     */
    public int doStartTag() throws JspException {
        eval();

        try {
            User user = (User) pageContext.getSession().getAttribute(IConst.SESSION.USER_KEY);

            Date lastvisit = null;
            HashMap visited = (HashMap) pageContext.getSession().getAttribute(IConst.SESSION.LAST_INTIME);

            if ((!visited.isEmpty()) && visited.containsKey(tid)) {
                lastvisit = (Date) visited.get(tid);
            } else {
                lastvisit = user.getIntime();
            }

            String username = (user.getName() != null) ? user.getName() : " ";

            if (lastvisit.before(getIntime()) && (!username.equals(sender))) {
                pageContext.setAttribute(IConst.PAGE.HAVE_AN_UPDATED_TOPICS,
                    IConst.VALUES.TRUE);

                return super.EVAL_BODY_INCLUDE;
            }
        } catch (Exception ex) {
        	if(LOG.isErrorEnabled())
        	{
				LOG.error("LastVisitTag::", ex);
        	}
            throw new JspException("error in LastVisitTag tag:", ex);
        }

        return (SKIP_BODY);
    }

    /**
     * DOCUMENT ME!
     *
     * @return
     */
    private Date getIntime() {
        return inTime;
    }

    /**
     * DOCUMENT ME!
     *
     * @return
     */
    public String getSender() {
        return sender;
    }

    /**
     * DOCUMENT ME!
     *
     * @return
     */
    public String getTid() {
        return tid;
    }

    /**
     * DOCUMENT ME!
     *
     * @param string
     */
    public void setIntime(String string) {
        intime = string;
    }

    /**
     * DOCUMENT ME!
     *
     * @param string
     */
    public void setSender(String string) {
        sender = string;
    }

    /**
     * DOCUMENT ME!
     *
     * @param string
     */
    public void setTid(String string) {
        tid = string;
    }
}