com.edgenius.wiki.gwt.client.page.widgets.RSSFeedButton.java Source code

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Here is the source code for com.edgenius.wiki.gwt.client.page.widgets.RSSFeedButton.java

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/* 
 * =============================================================
 * Copyright (C) 2007-2011 Edgenius (http://www.edgenius.com)
 * =============================================================
 * License Information: http://www.edgenius.com/licensing/edgenius/2.0/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2.0
 * as published by the Free Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * http://www.gnu.org/licenses/gpl.txt
 *  
 * ****************************************************************
 */
package com.edgenius.wiki.gwt.client.page.widgets;

import com.edgenius.wiki.gwt.client.Css;
import com.edgenius.wiki.gwt.client.GwtClientUtils;
import com.edgenius.wiki.gwt.client.i18n.Msg;
import com.edgenius.wiki.gwt.client.server.utils.GwtUtils;
import com.edgenius.wiki.gwt.client.server.utils.SharedConstants;
import com.edgenius.wiki.gwt.client.widgets.IconBundle;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Image;

/**
 * @author Dapeng.Ni
 */
public class RSSFeedButton extends FlowPanel {

    private String spaceUname;

    public RSSFeedButton() {
        this(null);
    }

    public RSSFeedButton(String spaceUname) {
        this.spaceUname = spaceUname;

        DOM.setStyleAttribute(this.getElement(), "display", "inline");
        if (this.spaceUname == null || this.spaceUname.trim().length() == 0) {
            this.setVisible(false);
        } else {
            buildPanel();
        }
    }

    /*
     * Must ensure spaceUname is not blank before this method because getRSSURL() requires non-blank spaceUname.  
     */
    private void buildPanel() {
        this.clear();

        Anchor feedLink = new Anchor("RSS", getRSSURL(), "_blank");
        Image feedImg = new Image(IconBundle.I.get().feed());
        feedImg.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                openFeed();
            }

        });
        feedImg.setStyleName(Css.PORTLET_FOOT_IMG);

        this.add(feedImg);
        //this just for surround <div> in Anchor, so it looks like with other button
        FlowPanel con = new FlowPanel();
        con.setStyleName("gwt-Hyperlink");
        con.add(feedLink);
        this.add(con);
    }

    public void setSpaceUname(String spaceUname) {
        this.spaceUname = spaceUname;
        if (this.spaceUname == null || this.spaceUname.trim().length() == 0) {
            this.setVisible(false);
        } else {
            buildPanel();
            this.setVisible(true);
        }
    }

    private void openFeed() {
        if (this.spaceUname == null || this.spaceUname.trim().length() == 0) {
            Window.alert(Msg.consts.error_request());
            return;
        }
        //TODO: user spaceUid? it also not good as it stick to database record, which may change after backup/restore
        //      if(GwtUtils.isSupportInURL(spaceUname)){
        Window.open(getRSSURL(), SharedConstants.APP_NAME + "RSSFeed", "");
        //      }else{
        //         Window.open(GwtUtils.getBaseUrl()+"feed.do?suid="+spaceUid,SharedConstants.APP_NAME+"RSSFeed","");
        //      }
    }

    /**
     * @return
     */
    private String getRSSURL() {
        if (GwtUtils.isSupportInURL(spaceUname))
            return GwtClientUtils.getBaseUrl() + "feed/" + URL.encodeComponent(spaceUname);
        else
            //if spaceUname include "/", and put it into URL rather than parameters, I found any web filter won't get it, and it cause weird problem
            //even after encode.
            return GwtClientUtils.getBaseUrl() + "feed.do?s=" + URL.encodeComponent(spaceUname);
    }
}