001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.text.renderers;
020    
021    import org.crsh.text.Color;
022    import org.crsh.text.Decoration;
023    import org.crsh.text.LineRenderer;
024    import org.crsh.text.Renderer;
025    import org.crsh.text.ui.LabelElement;
026    import org.crsh.text.ui.Overflow;
027    import org.crsh.text.ui.RowElement;
028    import org.crsh.text.ui.TableElement;
029    import org.crsh.util.Utils;
030    
031    import javax.management.InstanceNotFoundException;
032    import javax.management.IntrospectionException;
033    import javax.management.JMException;
034    import javax.management.MBeanInfo;
035    import javax.management.MBeanServer;
036    import javax.management.ObjectName;
037    import javax.management.ReflectionException;
038    import java.lang.management.ManagementFactory;
039    import java.util.Collections;
040    import java.util.Iterator;
041    import java.util.List;
042    
043    /**
044     * @author Julien Viet
045     */
046    public class ObjectNameRenderer extends Renderer<ObjectName> {
047    
048      @Override
049      public Class<ObjectName> getType() {
050        return ObjectName.class;
051      }
052    
053      @Override
054      public LineRenderer renderer(Iterator<ObjectName> stream) {
055    
056        MBeanServer server = ManagementFactory.getPlatformMBeanServer();
057    
058        List<ObjectName> names = Utils.list(stream);
059        Collections.sort(names);
060    
061        //
062        TableElement table = new TableElement().overflow(Overflow.HIDDEN).rightCellPadding(1);
063    
064        // Header
065        table.add(
066          new RowElement().
067            style(Decoration.bold.fg(Color.black).bg(Color.white)).
068            add("NAME", "CLASSNAME", "MXBEAN", "DESCRIPTION")
069        );
070    
071        //
072        for (ObjectName name : names) {
073    
074          String className;
075          String description;
076          String mxbean;
077          try {
078            MBeanInfo info = server.getMBeanInfo(name);
079            className = info.getClassName();
080            description = info.getDescription();
081            Object mxbeanValue = info.getDescriptor().getFieldValue("mxbean");
082            mxbean = mxbeanValue != null ? mxbeanValue.toString() : "false";
083          }
084          catch (JMException ignore) {
085            className = "";
086            description = "";
087            mxbean = "";
088          }
089    
090          //
091          table.row("" + name, className, mxbean, description);
092        }
093    
094        //
095        return table.renderer();
096      }
097    }