org.pepstock.jem.gwt.client.panels.administration.gfs.GfsHeader.java Source code

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Here is the source code for org.pepstock.jem.gwt.client.panels.administration.gfs.GfsHeader.java

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/**
JEM, the BEE - Job Entry Manager, the Batch Execution Environment
Copyright (C) 2012-2015   Andrea "Stock" Stocchero
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 3 of the License, or
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/>.
*/
package org.pepstock.jem.gwt.client.panels.administration.gfs;

import org.pepstock.jem.gwt.client.Sizes;
import org.pepstock.jem.gwt.client.commons.InspectListener;
import org.pepstock.jem.gwt.client.panels.administration.commons.Instances;
import org.pepstock.jem.node.stats.FileSystemUtilization;
import org.pepstock.jem.node.stats.LightMemberSample;

import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.ListBox;

/**
 * Header of GFS panel, where you can choose the file system to show
 * @author Andrea "Stock" Stocchero
 * @version 2.2
 */
public class GfsHeader extends FlexTable {

    /**
     * Fixed HEIGHT ofthis component
     */
    public static final int HEIGHT = 40;

    final ListBox typeCombo = new ListBox();

    private InspectListener<String> listener = null;

    /**
     * Empty constructor
     */
    public GfsHeader() {
        setHeight(HEIGHT + "px");
        setWidth(Sizes.HUNDRED_PERCENT);

        RowFormatter rf = getRowFormatter();
        rf.setVerticalAlign(0, HasVerticalAlignment.ALIGN_MIDDLE);

        FlexCellFormatter cf = getFlexCellFormatter();

        cf.setWidth(0, 0, Sizes.HUNDRED_PERCENT);
        cf.setHorizontalAlignment(0, 0, HasHorizontalAlignment.ALIGN_RIGHT);
        setHTML(0, 0, "FileSystem:");

        // set 30% of space for the combo box
        cf.setWidth(0, 1, "30%");

        // logoff button (and handler)
        typeCombo.addChangeHandler(new ChangeHandler() {
            @Override
            public void onChange(ChangeEvent event) {
                fireSelection();
            }
        });
        cf.setWordWrap(0, 1, false);
        cf.setVerticalAlignment(0, 1, HasVerticalAlignment.ALIGN_MIDDLE);
        cf.setHorizontalAlignment(0, 1, HasHorizontalAlignment.ALIGN_RIGHT);
        setWidget(0, 1, typeCombo);
    }

    /**
     * If combo is empty, it loads all defined file systems names
     */
    public void load() {
        if (typeCombo.getItemCount() == 0) {
            LightMemberSample msample = Instances.getLastSample().getMembers().iterator().next();
            for (FileSystemUtilization fsUtil : msample.getFileSystems()) {
                typeCombo.addItem(fsUtil.getName());
            }
            typeCombo.setSelectedIndex(0);
        }
        fireSelection();
    }

    /**
     * Informs the listener that an item in the combo has been chosen
     */
    private void fireSelection() {
        if (listener != null) {
            listener.inspect(typeCombo.getItemText(typeCombo.getSelectedIndex()));
        }
    }

    /**
     * @return the listener
     */
    public InspectListener<String> getListener() {
        return listener;
    }

    /**
     * @param listener the listener to set
     */
    public void setListener(InspectListener<String> listener) {
        this.listener = listener;
    }
}