de.metas.procurement.webui.ui.view.InfoMessageView.java Source code

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Here is the source code for de.metas.procurement.webui.ui.view.InfoMessageView.java

Source

package de.metas.procurement.webui.ui.view;

import org.springframework.beans.factory.annotation.Autowired;
import org.vaadin.spring.i18n.I18N;

import com.google.gwt.thirdparty.guava.common.base.Optional;
import com.vaadin.shared.ui.label.ContentMode;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.Label;

import de.metas.procurement.webui.Application;
import de.metas.procurement.webui.service.ISettingsService;

/*
 * #%L
 * de.metas.procurement.webui
 * %%
 * Copyright (C) 2016 metas GmbH
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 * 
 * 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, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

/**
 * Display an info message which is provided by {@link ISettingsService#getInfoMessage()}.
 * 
 * @author metas-dev <dev@metas-fresh.com>
 *
 */
@SuppressWarnings("serial")
public class InfoMessageView extends MFProcurementNavigationView {
    private static final String STYLE = "info-message-view";

    @Autowired
    private I18N i18n;
    @Autowired
    private ISettingsService settingsService;

    private final Label label;

    private Optional<String> infoMessage;

    public InfoMessageView() {
        super();

        Application.autowire(this);

        addStyleName(STYLE);

        this.setCaption(i18n.getWithDefault("InfoMessageView.caption", "Info"));

        label = new Label();
        label.addStyleName("text");
        label.setContentMode(ContentMode.PREFORMATTED);
        setContent(new CssLayout(label));
    }

    @Override
    protected void onBecomingVisible() {
        load();
    }

    public final void resetAndLoad() {
        infoMessage = null;
        load();
    }

    private final void load() {
        final String infoMessageText = getInfoMessageText();
        label.setValue(infoMessageText);
    }

    private String getInfoMessageText() {
        if (infoMessage == null) {
            String infoMessageText = settingsService.getInfoMessage();
            if (infoMessageText != null) {
                infoMessageText = infoMessageText.trim();
            }

            infoMessage = Optional.fromNullable(infoMessageText);
        }

        return infoMessage.orNull();
    }

    public boolean isDisplayable() {
        final String infoMessageText = getInfoMessageText();
        return infoMessageText != null && !infoMessageText.isEmpty();
    }
}