fi.jasoft.feedreader.ui.AddFeedWindow.java Source code

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Here is the source code for fi.jasoft.feedreader.ui.AddFeedWindow.java

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/*
 * Copyright 2012 John Ahlroos
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package fi.jasoft.feedreader.ui;

import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Notification;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
import com.vaadin.ui.Button.ClickEvent;

import fi.jasoft.feedreader.data.Feed;

/**
 * Window presented for the user when a new feed should be entered
 * 
 * @author John Ahlroos / http://www.jasoft.fi
 */
public class AddFeedWindow extends Window {

    private TextField url;

    /**
     * Default constructor
     */
    public AddFeedWindow() {
        setModal(true);
        setWidth("300px");
        setHeight("100px");
        setResizable(false);
        setDraggable(false);
        setCaption("Add RSS/Atom Feed");

        VerticalLayout windowContent = new VerticalLayout();
        windowContent.setSpacing(true);
        windowContent.setMargin(true);
        windowContent.setSizeFull();
        setContent(windowContent);

        url = new TextField("Feed url");
        url.setWidth("100%");
        windowContent.addComponent(url);
        windowContent.setComponentAlignment(url, Alignment.MIDDLE_CENTER);

        HorizontalLayout buttons = new HorizontalLayout();

        buttons.addComponent(new Button("Add", new Button.ClickListener() {
            @Override
            public void buttonClick(ClickEvent event) {
                if (validateUrl(url.getValue())) {
                    close();
                } else {
                    Notification.show("URL not valid");
                }
            }
        }));

        buttons.addComponent(new Button("Cancel", new Button.ClickListener() {
            @Override
            public void buttonClick(ClickEvent event) {
                url.setValue(null);
                close();
            }
        }));

        windowContent.addComponent(buttons);
        windowContent.setComponentAlignment(buttons, Alignment.BOTTOM_RIGHT);

        windowContent.setExpandRatio(url, 1);
    }

    /**
     * Ensure that a text representation of an URL is valid.
     * 
     * @param url
     *       The url to validate
     * @return
     *       Return true if the url is valid, false if it is invalid
     */
    private boolean validateUrl(String url) {
        // A really simple validation. Should be replaced with a better one.
        return url != null && url.startsWith("http");
    }

    /**
     * Get the feed created by the window. Does not save the feed, 
     * it should be done by the callee.
     * 
     * @return
     *       Returns the new feed create by the window.
     */
    public Feed getFeed() {
        if (!validateUrl(url.getValue())) {
            return null;
        }
        Feed feed = new Feed();
        feed.setUrl(url.getValue());
        return feed;
    }
}