blockoptionstag.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 131 行

/*
 * $$Id: BlockOptionsTag.java,v 1.6 2004/06/03 00:20:04 alexnet Exp $$
 *
 * ***** 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 Oct 6, 2003
 *
  */
package org.jresearch.gossip.tags;

import org.jresearch.gossip.IConst;
import org.jresearch.gossip.list.RecordsData;

import java.util.ArrayList;
import java.util.Enumeration;

import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;


/**
 * DOCUMENT ME!
 *
 * @author Bel
 */
public class BlockOptionsTag extends TagSupport {
    private String id;

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     *
     * @throws JspException DOCUMENT ME!
     */
    public int doStartTag() throws JspException {
        try {
            if (pageContext.getAttribute(id) != null) {
                return (SKIP_BODY);
            }
			HttpServletResponse response = (HttpServletResponse) pageContext.getResponse();
            ServletRequest req = pageContext.getRequest();
            Enumeration pnames = req.getParameterNames();
            StringBuffer url = new StringBuffer((String) req.getAttribute(
                        IConst.REQUEST.REQUEST_URI) + "?");

            while (pnames.hasMoreElements()) {
                String name = (String) pnames.nextElement();

                if (!name.equals("block")) {
                    url.append(name);
                    url.append("=");
                    url.append(req.getParameter(name));
                }

                if (pnames.hasMoreElements()) {
                    url.append("&");
                }
            }

            RecordsData recordsData = (RecordsData) req.getAttribute(IConst.REQUEST.RECORDS_DATA);
            ArrayList options = new ArrayList();

            int i = 0;

            while (i < recordsData.getRecordsCount()) {
                int endRecord = ((i + recordsData.getBlockSize()) < recordsData.getRecordsCount())
                    ? (i + recordsData.getBlockSize())
                    : recordsData.getRecordsCount();
                OptionBean ob = new OptionBean();

                ob.setProperty(response.encodeURL(url.toString() + "&block=" + i));
                ob.setLabelProperty((i + 1) + "-" + endRecord);
                options.add(ob);

                if (i == recordsData.getCurrBlock()) {
                    pageContext.setAttribute(IConst.PAGE.SELECTED_BLOCK, ob);
                }

                i = endRecord;
            }

            pageContext.setAttribute(id, options);
        } catch (Exception ex) {
            throw new JspException("error in BlockOptionsTag tag:", ex);
        }

        return (SKIP_BODY);
    }

    /**
     * DOCUMENT ME!
     *
     * @return
     */
    public String getId() {
        return id;
    }

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