rssnewchanneldialog.java

OpenCMS内容管理入门指南

/*
 * This library is part of the code for the book: OpenCms for Developers
 *
 * Copyright (c) 2007, 2008 Dan Liliedahl
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.deepthoughts.rss.admin;

import java.io.IOException;
import java.util.Arrays;
import java.util.Hashtable;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;

import org.opencms.jsp.CmsJspActionElement;
import org.opencms.main.CmsException;
import org.opencms.widgets.CmsCalendarWidget;
import org.opencms.widgets.CmsDisplayWidget;
import org.opencms.widgets.CmsInputWidget;
import org.opencms.widgets.CmsVfsFileWidget;
import org.opencms.workplace.CmsWidgetDialog;
import org.opencms.workplace.CmsWidgetDialogParameter;
import org.opencms.workplace.CmsWorkplaceSettings;

import com.deepthoughts.rss.RssChannelDef;

public class RSSNewChannelDialog extends CmsWidgetDialog {

	/** prefix for localized strings */
	public static final String KEY_PREFIX = "rssadmin";
		
    /** Defines which pages are valid for this dialog. */
    public static final String[] PAGE_ARRAY = {"channel_info", "channel_name"};

    /** The allowed pages for this dialog in a List. */
    public static final List PAGE_LIST = Arrays.asList(PAGE_ARRAY);

    /** The RSS Channel */
    RssChannelDef m_channel;

    /** Informational text */
    String infoText;
    
	public String getInfoText() {
		return infoText;
	}
	public void setInfoText(String infoText) {
		this.infoText = infoText;
	}

    /**
     * Public constructor with JSP variables.<p>
     * 
     * @param context the JSP page context
     * @param req the JSP request
     * @param res the JSP response
     */
    public RSSNewChannelDialog(PageContext context, HttpServletRequest req, HttpServletResponse res) {
        super(new CmsJspActionElement(context, req, res));
    }

    /**
     * @see org.opencms.workplace.CmsWidgetDialog#getPageArray()
     */
    protected String[] getPageArray() {
        return PAGE_ARRAY;
    }

    /**
     * @see org.opencms.workplace.CmsWidgetDialog#initMessages()
     */
    protected void initMessages() {
        // add default resource bundles
        addMessages(Messages.get().getBundleName());
        super.initMessages();
    }

    /**
     * @see CmsWidgetDialog#initWorkplaceSettings(org.opencms.file.CmsObject, CmsWorkplaceSettings, boolean)
     */
    protected void initWorkplaceRequestValues(CmsWorkplaceSettings settings, HttpServletRequest request) {
        // set the dialog message prefix
    	setKeyPrefix(KEY_PREFIX);
    	
    	super.initWorkplaceRequestValues(settings, request);
    	
        // save the current state of the job (may be changed because of the widget values)
        setDialogObject(m_channel);
    }
    
    /**
     * Creates the list of widgets for this dialog.<p>
     */
    protected void defineWidgets() {

    	// get the data fields from the context
    	getDialogData();
        
        // Page 1
        addWidget(new CmsWidgetDialogParameter(m_channel, "title", PAGE_ARRAY[0], new CmsInputWidget()));
        addWidget(new CmsWidgetDialogParameter(m_channel, "description", PAGE_ARRAY[0], new CmsInputWidget()));
        addWidget(new CmsWidgetDialogParameter(m_channel, "copyright", null, PAGE_ARRAY[0], new CmsInputWidget(), 0, 1 ));
        addWidget(new CmsWidgetDialogParameter(m_channel, "author", null, PAGE_ARRAY[0], new CmsInputWidget(), 0, 1 ));
        addWidget(new CmsWidgetDialogParameter(m_channel, "publishedDate", null, PAGE_ARRAY[0], new CmsCalendarWidget(), 0, 1));
        addWidget(new CmsWidgetDialogParameter(m_channel, "image", null, PAGE_ARRAY[0], new CmsVfsFileWidget(), 0, 1));
        addWidget(new CmsWidgetDialogParameter(m_channel, "imageTitle", null, PAGE_ARRAY[0], new CmsInputWidget(), 0, 1));

        // Page 2
        infoText = "Please enter a file name for this channel";
        addWidget(new CmsWidgetDialogParameter(this, "infoText", null, PAGE_ARRAY[1], new CmsDisplayWidget()));
        addWidget(new CmsWidgetDialogParameter(m_channel, "filename", null, PAGE_ARRAY[1], new CmsInputWidget()));
    }

    private boolean editChannelClicked() {
        // see if the edit icon was clicked on
        String strFeed = getJsp().getRequest().getParameter("feed");
        if (null != strFeed) {
        	try {
        		// load the channel into the bean
				m_channel = new RssChannelDef(getCms(), RSSFeedManager.getFeedRepositoryPath() + strFeed);
				return true;
			} catch (CmsException e) {
				e.printStackTrace();
			}
        }
        return false;
    }
    /**
     * Obtains the dialog data from the context.
     */
    private void getDialogData() {
        Object o = getSettings().getDialogObject();
        if (null == o) {
        	// first time, handle edit or new
        	// either a new channel or invoked from 'edit'
        	if (! editChannelClicked()) {
        		m_channel = new RssChannelDef(getCms());
            }
        } else {
        	// non-null dialog object, retrieve bean from state
        	Object existingChannel = ((Hashtable)o).get(this.getClass().getName()); 
        	if (null != existingChannel) {
        		m_channel = (RssChannelDef) existingChannel; 
        	} else {
        		if (! editChannelClicked()) {
                	m_channel = new RssChannelDef(getCms());
                }
        	}
        }
    }
    
    /**
     * Save the RSSChannelDef to a resource
     */
	public void actionCommit() throws IOException, ServletException {
		// Save the channel
		RSSFeedManager.getFeedManager(getCms()).saveOrUpdateChannel(getJsp().getJspContext(), m_channel);
		
		// clear the object
		getSettings().setDialogObject(null);
		m_channel = null;
	}
}