lucene/luke/src/java/org/apache/lucene/luke/app/desktop/components/CommitsPanelProvider.java - lucene-solr - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You 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 org.apache.lucene.luke.app.desktop.components;

 import javax.swing.BorderFactory;
 import javax.swing.BoxLayout;
 import javax.swing.ButtonGroup;
 import javax.swing.DefaultComboBoxModel;
 import javax.swing.DefaultListModel;
 import javax.swing.JComboBox;
 import javax.swing.JLabel;
 import javax.swing.JList;
 import javax.swing.JPanel;
 import javax.swing.JRadioButton;
 import javax.swing.JScrollPane;
 import javax.swing.JSplitPane;
 import javax.swing.JTable;
 import javax.swing.JTextArea;
 import javax.swing.ListSelectionModel;
 import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.FlowLayout;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.GridLayout;
 import java.awt.event.ActionEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import org.apache.lucene.index.DirectoryReader;
 import org.apache.lucene.luke.app.DirectoryHandler;
 import org.apache.lucene.luke.app.DirectoryObserver;
 import org.apache.lucene.luke.app.IndexHandler;
 import org.apache.lucene.luke.app.IndexObserver;
 import org.apache.lucene.luke.app.LukeState;
 import org.apache.lucene.luke.app.desktop.util.MessageUtils;
 import org.apache.lucene.luke.app.desktop.util.TableUtils;
 import org.apache.lucene.luke.models.commits.Commit;
 import org.apache.lucene.luke.models.commits.Commits;
 import org.apache.lucene.luke.models.commits.CommitsFactory;
 import org.apache.lucene.luke.models.commits.File;
 import org.apache.lucene.luke.models.commits.Segment;

 /** Provider of the Commits panel */
 public final class CommitsPanelProvider {

   private final CommitsFactory commitsFactory = new CommitsFactory();

   private final JComboBox<Long> commitGenCombo = new JComboBox<>();

   private final JLabel deletedLbl = new JLabel();

   private final JLabel segCntLbl = new JLabel();

   private final JTextArea userDataTA = new JTextArea();

   private final JTable filesTable = new JTable();

   private final JTable segmentsTable = new JTable();

   private final JRadioButton diagRB = new JRadioButton();

   private final JRadioButton attrRB = new JRadioButton();

   private final JRadioButton codecRB = new JRadioButton();

   private final ButtonGroup rbGroup = new ButtonGroup();

   private final JList<String> segDetailList = new JList<>();

   private ListenerFunctions listeners = new ListenerFunctions();

   private Commits commitsModel;

   public CommitsPanelProvider() {
     IndexHandler.getInstance().addObserver(new Observer());
     DirectoryHandler.getInstance().addObserver(new Observer());
   }

   public JPanel get() {
     JPanel panel = new JPanel(new GridLayout(1, 1));
     panel.setOpaque(false);
     panel.setBorder(BorderFactory.createLineBorder(Color.gray));

     JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, initUpperPanel(), initLowerPanel());
     splitPane.setOpaque(false);
     splitPane.setBorder(BorderFactory.createEmptyBorder());
     splitPane.setDividerLocation(120);
     panel.add(splitPane);

     return panel;
   }

   private JPanel initUpperPanel() {
     JPanel panel = new JPanel(new BorderLayout(20, 0));
     panel.setOpaque(false);
     panel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));

     JPanel left = new JPanel(new FlowLayout(FlowLayout.LEADING));
     left.setOpaque(false);
     left.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.select_gen")));
     commitGenCombo.addActionListener(listeners::selectGeneration);
     left.add(commitGenCombo);
     panel.add(left, BorderLayout.LINE_START);

     JPanel right = new JPanel(new GridBagLayout());
     right.setOpaque(false);
     GridBagConstraints c1 = new GridBagConstraints();
     c1.ipadx = 5;
     c1.ipady = 5;

     c1.gridx = 0;
     c1.gridy = 0;
     c1.weightx = 0.2;
     c1.anchor = GridBagConstraints.EAST;
     right.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.deleted")), c1);

     c1.gridx = 1;
     c1.gridy = 0;
     c1.weightx = 0.5;
     c1.anchor = GridBagConstraints.WEST;
     right.add(deletedLbl, c1);

     c1.gridx = 0;
     c1.gridy = 1;
     c1.weightx = 0.2;
     c1.anchor = GridBagConstraints.EAST;
     right.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.segcount")), c1);

     c1.gridx = 1;
     c1.gridy = 1;
     c1.weightx = 0.5;
     c1.anchor = GridBagConstraints.WEST;
     right.add(segCntLbl, c1);

     c1.gridx = 0;
     c1.gridy = 2;
     c1.weightx = 0.2;
     c1.anchor = GridBagConstraints.EAST;
     right.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.userdata")), c1);

     userDataTA.setRows(3);
     userDataTA.setColumns(30);
     userDataTA.setLineWrap(true);
     userDataTA.setWrapStyleWord(true);
     userDataTA.setEditable(false);
     JScrollPane userDataScroll = new JScrollPane(userDataTA, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
     c1.gridx = 1;
     c1.gridy = 2;
     c1.weightx = 0.5;
     c1.anchor = GridBagConstraints.WEST;
     right.add(userDataScroll, c1);

     panel.add(right, BorderLayout.CENTER);

     return panel;
   }

   private JPanel initLowerPanel() {
     JPanel panel = new JPanel(new GridLayout(1, 1));
     panel.setOpaque(false);
     panel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));

     JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, initFilesPanel(), initSegmentsPanel());
     splitPane.setOpaque(false);
     splitPane.setBorder(BorderFactory.createEmptyBorder());
     splitPane.setDividerLocation(300);
     panel.add(splitPane);
     return panel;
   }

   private JPanel initFilesPanel() {
     JPanel panel = new JPanel(new BorderLayout());
     panel.setOpaque(false);
     panel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));

     JPanel header = new JPanel(new FlowLayout(FlowLayout.LEADING));
     header.setOpaque(false);
     header.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.files")));
     panel.add(header, BorderLayout.PAGE_START);

     TableUtils.setupTable(filesTable, ListSelectionModel.SINGLE_SELECTION, new FilesTableModel(), null, FilesTableModel.Column.FILENAME.getColumnWidth());
     panel.add(new JScrollPane(filesTable), BorderLayout.CENTER);

     return panel;
   }

   private JPanel initSegmentsPanel() {
     JPanel panel = new JPanel();
     panel.setOpaque(false);
     panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));

     JPanel segments = new JPanel(new FlowLayout(FlowLayout.LEADING));
     segments.setOpaque(false);
     segments.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.segments")));
     panel.add(segments);

     TableUtils.setupTable(segmentsTable, ListSelectionModel.SINGLE_SELECTION, new SegmentsTableModel(),
         new MouseAdapter() {
           @Override
           public void mouseClicked(MouseEvent e) {
             listeners.showSegmentDetails(e);
           }
         },
         SegmentsTableModel.Column.NAME.getColumnWidth(),
         SegmentsTableModel.Column.MAXDOCS.getColumnWidth(),
         SegmentsTableModel.Column.DELS.getColumnWidth(),
         SegmentsTableModel.Column.DELGEN.getColumnWidth(),
         SegmentsTableModel.Column.VERSION.getColumnWidth(),
         SegmentsTableModel.Column.CODEC.getColumnWidth());
     panel.add(new JScrollPane(segmentsTable));

     JPanel segDetails = new JPanel(new FlowLayout(FlowLayout.LEADING));
     segDetails.setOpaque(false);
     segDetails.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.segdetails")));
     panel.add(segDetails);

     JPanel buttons = new JPanel(new FlowLayout(FlowLayout.LEADING));
     buttons.setOpaque(false);

     diagRB.setText("Diagnostics");
     diagRB.setActionCommand(ActionCommand.DIAGNOSTICS.name());
     diagRB.setSelected(true);
     diagRB.setEnabled(false);
     diagRB.setOpaque(false);
     diagRB.addMouseListener(new MouseAdapter() {
       @Override
       public void mouseClicked(MouseEvent e) {
         listeners.showSegmentDetails(e);
       }
     });
     buttons.add(diagRB);

     attrRB.setText("Attributes");
     attrRB.setActionCommand(ActionCommand.ATTRIBUTES.name());
     attrRB.setSelected(false);
     attrRB.setEnabled(false);
     attrRB.setOpaque(false);
     attrRB.addMouseListener(new MouseAdapter() {
       @Override
       public void mouseClicked(MouseEvent e) {
         listeners.showSegmentDetails(e);
       }
     });
     buttons.add(attrRB);

     codecRB.setText("Codec");
     codecRB.setActionCommand(ActionCommand.CODEC.name());
     codecRB.setSelected(false);
     codecRB.setEnabled(false);
     codecRB.setOpaque(false);
     codecRB.addMouseListener(new MouseAdapter() {
       @Override
       public void mouseClicked(MouseEvent e) {
         listeners.showSegmentDetails(e);
       }
     });
     buttons.add(codecRB);

     rbGroup.add(diagRB);
     rbGroup.add(attrRB);
     rbGroup.add(codecRB);

     panel.add(buttons);

     segDetailList.setVisibleRowCount(10);
     panel.add(new JScrollPane(segDetailList));

     return panel;
   }

   // control methods

   private void selectGeneration() {
     diagRB.setEnabled(false);
     attrRB.setEnabled(false);
     codecRB.setEnabled(false);
     segDetailList.setModel(new DefaultListModel<>());

     long commitGen = (long) commitGenCombo.getSelectedItem();
     commitsModel.getCommit(commitGen).ifPresent(commit -> {
       deletedLbl.setText(String.valueOf(commit.isDeleted()));
       segCntLbl.setText(String.valueOf(commit.getSegCount()));
       userDataTA.setText(commit.getUserData());
     });

     filesTable.setModel(new FilesTableModel(commitsModel.getFiles(commitGen)));
     filesTable.setShowGrid(true);
     filesTable.getColumnModel().getColumn(FilesTableModel.Column.FILENAME.getIndex()).setPreferredWidth(FilesTableModel.Column.FILENAME.getColumnWidth());

     segmentsTable.setModel(new SegmentsTableModel(commitsModel.getSegments(commitGen)));
     segmentsTable.setShowGrid(true);
     segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.NAME.getIndex()).setPreferredWidth(SegmentsTableModel.Column.NAME.getColumnWidth());
     segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.MAXDOCS.getIndex()).setPreferredWidth(SegmentsTableModel.Column.MAXDOCS.getColumnWidth());
     segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.DELS.getIndex()).setPreferredWidth(SegmentsTableModel.Column.DELS.getColumnWidth());
     segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.DELGEN.getIndex()).setPreferredWidth(SegmentsTableModel.Column.DELGEN.getColumnWidth());
     segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.VERSION.getIndex()).setPreferredWidth(SegmentsTableModel.Column.VERSION.getColumnWidth());
     segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.CODEC.getIndex()).setPreferredWidth(SegmentsTableModel.Column.CODEC.getColumnWidth());
   }

   private void showSegmentDetails() {
     int selectedRow = segmentsTable.getSelectedRow();
     if (commitGenCombo.getSelectedItem() == null ||
         selectedRow < 0 || selectedRow >= segmentsTable.getRowCount()) {
       return;
     }

     diagRB.setEnabled(true);
     attrRB.setEnabled(true);
     codecRB.setEnabled(true);

     long commitGen = (long) commitGenCombo.getSelectedItem();
     String segName = (String) segmentsTable.getValueAt(selectedRow, SegmentsTableModel.Column.NAME.getIndex());
     ActionCommand command = ActionCommand.valueOf(rbGroup.getSelection().getActionCommand());

     final DefaultListModel<String> detailsModel = new DefaultListModel<>();
     switch (command) {
       case DIAGNOSTICS:
         commitsModel.getSegmentDiagnostics(commitGen, segName).entrySet().stream()
             .map(entry -> entry.getKey() + " = " + entry.getValue())
             .forEach(detailsModel::addElement);
         break;
       case ATTRIBUTES:
         commitsModel.getSegmentAttributes(commitGen, segName).entrySet().stream()
             .map(entry -> entry.getKey() + " = " + entry.getValue())
             .forEach(detailsModel::addElement);
         break;
       case CODEC:
         commitsModel.getSegmentCodec(commitGen, segName).ifPresent(codec -> {
           Map<String, String> map = new HashMap<>();
           map.put("Codec name", codec.getName());
           map.put("Codec class name", codec.getClass().getName());
           map.put("Compound format", codec.compoundFormat().getClass().getName());
           map.put("DocValues format", codec.docValuesFormat().getClass().getName());
           map.put("FieldInfos format", codec.fieldInfosFormat().getClass().getName());
           map.put("LiveDocs format", codec.liveDocsFormat().getClass().getName());
           map.put("Norms format", codec.normsFormat().getClass().getName());
           map.put("Points format", codec.pointsFormat().getClass().getName());
           map.put("Postings format", codec.postingsFormat().getClass().getName());
           map.put("SegmentInfo format", codec.segmentInfoFormat().getClass().getName());
           map.put("StoredFields format", codec.storedFieldsFormat().getClass().getName());
           map.put("TermVectors format", codec.termVectorsFormat().getClass().getName());
           map.entrySet().stream()
               .map(entry -> entry.getKey() + " = " + entry.getValue()).forEach(detailsModel::addElement);
         });
         break;
     }
     segDetailList.setModel(detailsModel);

   }

   private class ListenerFunctions {

     void selectGeneration(ActionEvent e) {
       CommitsPanelProvider.this.selectGeneration();
     }

     void showSegmentDetails(MouseEvent e) {
       CommitsPanelProvider.this.showSegmentDetails();
     }

   }

   private class Observer implements IndexObserver, DirectoryObserver {

     @Override
     public void openDirectory(LukeState state) {
       commitsModel = commitsFactory.newInstance(state.getDirectory(), state.getIndexPath());
       populateCommitGenerations();
     }

     @Override
     public void closeDirectory() {
       close();
     }

     @Override
     public void openIndex(LukeState state) {
       if (state.hasDirectoryReader()) {
         DirectoryReader dr = (DirectoryReader) state.getIndexReader();
         commitsModel = commitsFactory.newInstance(dr, state.getIndexPath());
         populateCommitGenerations();
       }
     }

     @Override
     public void closeIndex() {
       close();
     }

     private void populateCommitGenerations() {
       DefaultComboBoxModel<Long> segGenList = new DefaultComboBoxModel<>();
       for (Commit commit : commitsModel.listCommits()) {
         segGenList.addElement(commit.getGeneration());
       }
       commitGenCombo.setModel(segGenList);

       if (segGenList.getSize() > 0) {
         commitGenCombo.setSelectedIndex(0);
       }
     }

     private void close() {
       commitsModel = null;

       commitGenCombo.setModel(new DefaultComboBoxModel<>());
       deletedLbl.setText("");
       segCntLbl.setText("");
       userDataTA.setText("");
       TableUtils.setupTable(filesTable, ListSelectionModel.SINGLE_SELECTION, new FilesTableModel(), null, FilesTableModel.Column.FILENAME.getColumnWidth());
       TableUtils.setupTable(segmentsTable, ListSelectionModel.SINGLE_SELECTION, new SegmentsTableModel(), null,
           SegmentsTableModel.Column.NAME.getColumnWidth(),
           SegmentsTableModel.Column.MAXDOCS.getColumnWidth(),
           SegmentsTableModel.Column.DELS.getColumnWidth(),
           SegmentsTableModel.Column.DELGEN.getColumnWidth(),
           SegmentsTableModel.Column.VERSION.getColumnWidth(),
           SegmentsTableModel.Column.CODEC.getColumnWidth());
       diagRB.setEnabled(false);
       attrRB.setEnabled(false);
       codecRB.setEnabled(false);
       segDetailList.setModel(new DefaultListModel<>());
     }
   }

   enum ActionCommand {
     DIAGNOSTICS, ATTRIBUTES, CODEC;
   }

   static final class FilesTableModel extends TableModelBase<FilesTableModel.Column> {

     enum Column implements TableColumnInfo {

       FILENAME("Filename", 0, String.class, 200),
       SIZE("Size", 1, String.class, Integer.MAX_VALUE);

       private final String colName;
       private final int index;
       private final Class<?> type;
       private final int width;

       Column(String colName, int index, Class<?> type, int width) {
         this.colName = colName;
         this.index = index;
         this.type = type;
         this.width = width;
       }

       @Override
       public String getColName() {
         return colName;
       }

       @Override
       public int getIndex() {
         return index;
       }

       @Override
       public Class<?> getType() {
         return type;
       }

       @Override
       public int getColumnWidth() {
         return width;
       }
     }

     FilesTableModel() {
       super();
     }

     FilesTableModel(List<File> files) {
       super(files.size());
       for (int i = 0; i < files.size(); i++) {
         File file = files.get(i);
         data[i][Column.FILENAME.getIndex()] = file.getFileName();
         data[i][Column.SIZE.getIndex()] = file.getDisplaySize();
       }
     }

     @Override
     protected Column[] columnInfos() {
       return Column.values();
     }
   }

   static final class SegmentsTableModel extends TableModelBase<SegmentsTableModel.Column> {

     enum Column implements TableColumnInfo {

       NAME("Name", 0, String.class, 60),
       MAXDOCS("Max docs", 1, Integer.class, 60),
       DELS("Dels", 2, Integer.class, 60),
       DELGEN("Del gen", 3, Long.class, 60),
       VERSION("Lucene ver.", 4, String.class, 60),
       CODEC("Codec", 5, String.class, 100),
       SIZE("Size", 6, String.class, 150);

       private final String colName;
       private final int index;
       private final Class<?> type;
       private final int width;

       Column(String colName, int index, Class<?> type, int width) {
         this.colName = colName;
         this.index = index;
         this.type = type;
         this.width = width;
       }

       @Override
       public String getColName() {
         return colName;
       }

       @Override
       public int getIndex() {
         return index;
       }

       @Override
       public Class<?> getType() {
         return type;
       }

       @Override
       public int getColumnWidth() {
         return width;
       }
     }

     SegmentsTableModel() {
       super();
     }

     SegmentsTableModel(List<Segment> segments) {
       super(segments.size());
       for (int i = 0; i < segments.size(); i++) {
         Segment segment = segments.get(i);
         data[i][Column.NAME.getIndex()] = segment.getName();
         data[i][Column.MAXDOCS.getIndex()] = segment.getMaxDoc();
         data[i][Column.DELS.getIndex()] = segment.getDelCount();
         data[i][Column.DELGEN.getIndex()] = segment.getDelGen();
         data[i][Column.VERSION.getIndex()] = segment.getLuceneVer();
         data[i][Column.CODEC.getIndex()] = segment.getCodecName();
         data[i][Column.SIZE.getIndex()] = segment.getDisplaySize();
       }
     }

     @Override
     protected Column[] columnInfos() {
       return Column.values();
     }
   }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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 org.apache.lucene.luke.app.desktop.components;

	import javax.swing.BorderFactory;
	import javax.swing.BoxLayout;
	import javax.swing.ButtonGroup;
	import javax.swing.DefaultComboBoxModel;
	import javax.swing.DefaultListModel;
	import javax.swing.JComboBox;
	import javax.swing.JLabel;
	import javax.swing.JList;
	import javax.swing.JPanel;
	import javax.swing.JRadioButton;
	import javax.swing.JScrollPane;
	import javax.swing.JSplitPane;
	import javax.swing.JTable;
	import javax.swing.JTextArea;
	import javax.swing.ListSelectionModel;
	import java.awt.BorderLayout;
	import java.awt.Color;
	import java.awt.FlowLayout;
	import java.awt.GridBagConstraints;
	import java.awt.GridBagLayout;
	import java.awt.GridLayout;
	import java.awt.event.ActionEvent;
	import java.awt.event.MouseAdapter;
	import java.awt.event.MouseEvent;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

	import org.apache.lucene.index.DirectoryReader;
	import org.apache.lucene.luke.app.DirectoryHandler;
	import org.apache.lucene.luke.app.DirectoryObserver;
	import org.apache.lucene.luke.app.IndexHandler;
	import org.apache.lucene.luke.app.IndexObserver;
	import org.apache.lucene.luke.app.LukeState;
	import org.apache.lucene.luke.app.desktop.util.MessageUtils;
	import org.apache.lucene.luke.app.desktop.util.TableUtils;
	import org.apache.lucene.luke.models.commits.Commit;
	import org.apache.lucene.luke.models.commits.Commits;
	import org.apache.lucene.luke.models.commits.CommitsFactory;
	import org.apache.lucene.luke.models.commits.File;
	import org.apache.lucene.luke.models.commits.Segment;

	/** Provider of the Commits panel */
	public final class CommitsPanelProvider {

	private final CommitsFactory commitsFactory = new CommitsFactory();

	private final JComboBox<Long> commitGenCombo = new JComboBox<>();

	private final JLabel deletedLbl = new JLabel();

	private final JLabel segCntLbl = new JLabel();

	private final JTextArea userDataTA = new JTextArea();

	private final JTable filesTable = new JTable();

	private final JTable segmentsTable = new JTable();

	private final JRadioButton diagRB = new JRadioButton();

	private final JRadioButton attrRB = new JRadioButton();

	private final JRadioButton codecRB = new JRadioButton();

	private final ButtonGroup rbGroup = new ButtonGroup();

	private final JList<String> segDetailList = new JList<>();

	private ListenerFunctions listeners = new ListenerFunctions();

	private Commits commitsModel;

	public CommitsPanelProvider() {
	IndexHandler.getInstance().addObserver(new Observer());
	DirectoryHandler.getInstance().addObserver(new Observer());
	}

	public JPanel get() {
	JPanel panel = new JPanel(new GridLayout(1, 1));
	panel.setOpaque(false);
	panel.setBorder(BorderFactory.createLineBorder(Color.gray));

	JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, initUpperPanel(), initLowerPanel());
	splitPane.setOpaque(false);
	splitPane.setBorder(BorderFactory.createEmptyBorder());
	splitPane.setDividerLocation(120);
	panel.add(splitPane);

	return panel;
	}

	private JPanel initUpperPanel() {
	JPanel panel = new JPanel(new BorderLayout(20, 0));
	panel.setOpaque(false);
	panel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));

	JPanel left = new JPanel(new FlowLayout(FlowLayout.LEADING));
	left.setOpaque(false);
	left.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.select_gen")));
	commitGenCombo.addActionListener(listeners::selectGeneration);
	left.add(commitGenCombo);
	panel.add(left, BorderLayout.LINE_START);

	JPanel right = new JPanel(new GridBagLayout());
	right.setOpaque(false);
	GridBagConstraints c1 = new GridBagConstraints();
	c1.ipadx = 5;
	c1.ipady = 5;

	c1.gridx = 0;
	c1.gridy = 0;
	c1.weightx = 0.2;
	c1.anchor = GridBagConstraints.EAST;
	right.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.deleted")), c1);

	c1.gridx = 1;
	c1.gridy = 0;
	c1.weightx = 0.5;
	c1.anchor = GridBagConstraints.WEST;
	right.add(deletedLbl, c1);

	c1.gridx = 0;
	c1.gridy = 1;
	c1.weightx = 0.2;
	c1.anchor = GridBagConstraints.EAST;
	right.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.segcount")), c1);

	c1.gridx = 1;
	c1.gridy = 1;
	c1.weightx = 0.5;
	c1.anchor = GridBagConstraints.WEST;
	right.add(segCntLbl, c1);

	c1.gridx = 0;
	c1.gridy = 2;
	c1.weightx = 0.2;
	c1.anchor = GridBagConstraints.EAST;
	right.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.userdata")), c1);

	userDataTA.setRows(3);
	userDataTA.setColumns(30);
	userDataTA.setLineWrap(true);
	userDataTA.setWrapStyleWord(true);
	userDataTA.setEditable(false);
	JScrollPane userDataScroll = new JScrollPane(userDataTA, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
	c1.gridx = 1;
	c1.gridy = 2;
	c1.weightx = 0.5;
	c1.anchor = GridBagConstraints.WEST;
	right.add(userDataScroll, c1);

	panel.add(right, BorderLayout.CENTER);

	return panel;
	}

	private JPanel initLowerPanel() {
	JPanel panel = new JPanel(new GridLayout(1, 1));
	panel.setOpaque(false);
	panel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));

	JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, initFilesPanel(), initSegmentsPanel());
	splitPane.setOpaque(false);
	splitPane.setBorder(BorderFactory.createEmptyBorder());
	splitPane.setDividerLocation(300);
	panel.add(splitPane);
	return panel;
	}

	private JPanel initFilesPanel() {
	JPanel panel = new JPanel(new BorderLayout());
	panel.setOpaque(false);
	panel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));

	JPanel header = new JPanel(new FlowLayout(FlowLayout.LEADING));
	header.setOpaque(false);
	header.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.files")));
	panel.add(header, BorderLayout.PAGE_START);

	TableUtils.setupTable(filesTable, ListSelectionModel.SINGLE_SELECTION, new FilesTableModel(), null, FilesTableModel.Column.FILENAME.getColumnWidth());
	panel.add(new JScrollPane(filesTable), BorderLayout.CENTER);

	return panel;
	}

	private JPanel initSegmentsPanel() {
	JPanel panel = new JPanel();
	panel.setOpaque(false);
	panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));

	JPanel segments = new JPanel(new FlowLayout(FlowLayout.LEADING));
	segments.setOpaque(false);
	segments.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.segments")));
	panel.add(segments);

	TableUtils.setupTable(segmentsTable, ListSelectionModel.SINGLE_SELECTION, new SegmentsTableModel(),
	new MouseAdapter() {
	@Override
	public void mouseClicked(MouseEvent e) {
	listeners.showSegmentDetails(e);
	}
	},
	SegmentsTableModel.Column.NAME.getColumnWidth(),
	SegmentsTableModel.Column.MAXDOCS.getColumnWidth(),
	SegmentsTableModel.Column.DELS.getColumnWidth(),
	SegmentsTableModel.Column.DELGEN.getColumnWidth(),
	SegmentsTableModel.Column.VERSION.getColumnWidth(),
	SegmentsTableModel.Column.CODEC.getColumnWidth());
	panel.add(new JScrollPane(segmentsTable));

	JPanel segDetails = new JPanel(new FlowLayout(FlowLayout.LEADING));
	segDetails.setOpaque(false);
	segDetails.add(new JLabel(MessageUtils.getLocalizedMessage("commits.label.segdetails")));
	panel.add(segDetails);

	JPanel buttons = new JPanel(new FlowLayout(FlowLayout.LEADING));
	buttons.setOpaque(false);

	diagRB.setText("Diagnostics");
	diagRB.setActionCommand(ActionCommand.DIAGNOSTICS.name());
	diagRB.setSelected(true);
	diagRB.setEnabled(false);
	diagRB.setOpaque(false);
	diagRB.addMouseListener(new MouseAdapter() {
	@Override
	public void mouseClicked(MouseEvent e) {
	listeners.showSegmentDetails(e);
	}
	});
	buttons.add(diagRB);

	attrRB.setText("Attributes");
	attrRB.setActionCommand(ActionCommand.ATTRIBUTES.name());
	attrRB.setSelected(false);
	attrRB.setEnabled(false);
	attrRB.setOpaque(false);
	attrRB.addMouseListener(new MouseAdapter() {
	@Override
	public void mouseClicked(MouseEvent e) {
	listeners.showSegmentDetails(e);
	}
	});
	buttons.add(attrRB);

	codecRB.setText("Codec");
	codecRB.setActionCommand(ActionCommand.CODEC.name());
	codecRB.setSelected(false);
	codecRB.setEnabled(false);
	codecRB.setOpaque(false);
	codecRB.addMouseListener(new MouseAdapter() {
	@Override
	public void mouseClicked(MouseEvent e) {
	listeners.showSegmentDetails(e);
	}
	});
	buttons.add(codecRB);

	rbGroup.add(diagRB);
	rbGroup.add(attrRB);
	rbGroup.add(codecRB);

	panel.add(buttons);

	segDetailList.setVisibleRowCount(10);
	panel.add(new JScrollPane(segDetailList));

	return panel;
	}

	// control methods

	private void selectGeneration() {
	diagRB.setEnabled(false);
	attrRB.setEnabled(false);
	codecRB.setEnabled(false);
	segDetailList.setModel(new DefaultListModel<>());

	long commitGen = (long) commitGenCombo.getSelectedItem();
	commitsModel.getCommit(commitGen).ifPresent(commit -> {
	deletedLbl.setText(String.valueOf(commit.isDeleted()));
	segCntLbl.setText(String.valueOf(commit.getSegCount()));
	userDataTA.setText(commit.getUserData());
	});

	filesTable.setModel(new FilesTableModel(commitsModel.getFiles(commitGen)));
	filesTable.setShowGrid(true);
	filesTable.getColumnModel().getColumn(FilesTableModel.Column.FILENAME.getIndex()).setPreferredWidth(FilesTableModel.Column.FILENAME.getColumnWidth());

	segmentsTable.setModel(new SegmentsTableModel(commitsModel.getSegments(commitGen)));
	segmentsTable.setShowGrid(true);
	segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.NAME.getIndex()).setPreferredWidth(SegmentsTableModel.Column.NAME.getColumnWidth());
	segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.MAXDOCS.getIndex()).setPreferredWidth(SegmentsTableModel.Column.MAXDOCS.getColumnWidth());
	segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.DELS.getIndex()).setPreferredWidth(SegmentsTableModel.Column.DELS.getColumnWidth());
	segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.DELGEN.getIndex()).setPreferredWidth(SegmentsTableModel.Column.DELGEN.getColumnWidth());
	segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.VERSION.getIndex()).setPreferredWidth(SegmentsTableModel.Column.VERSION.getColumnWidth());
	segmentsTable.getColumnModel().getColumn(SegmentsTableModel.Column.CODEC.getIndex()).setPreferredWidth(SegmentsTableModel.Column.CODEC.getColumnWidth());
	}

	private void showSegmentDetails() {
	int selectedRow = segmentsTable.getSelectedRow();
	if (commitGenCombo.getSelectedItem() == null \|\|
	selectedRow < 0 \|\| selectedRow >= segmentsTable.getRowCount()) {
	return;
	}

	diagRB.setEnabled(true);
	attrRB.setEnabled(true);
	codecRB.setEnabled(true);

	long commitGen = (long) commitGenCombo.getSelectedItem();
	String segName = (String) segmentsTable.getValueAt(selectedRow, SegmentsTableModel.Column.NAME.getIndex());
	ActionCommand command = ActionCommand.valueOf(rbGroup.getSelection().getActionCommand());

	final DefaultListModel<String> detailsModel = new DefaultListModel<>();
	switch (command) {
	case DIAGNOSTICS:
	commitsModel.getSegmentDiagnostics(commitGen, segName).entrySet().stream()
	.map(entry -> entry.getKey() + " = " + entry.getValue())
	.forEach(detailsModel::addElement);
	break;
	case ATTRIBUTES:
	commitsModel.getSegmentAttributes(commitGen, segName).entrySet().stream()
	.map(entry -> entry.getKey() + " = " + entry.getValue())
	.forEach(detailsModel::addElement);
	break;
	case CODEC:
	commitsModel.getSegmentCodec(commitGen, segName).ifPresent(codec -> {
	Map<String, String> map = new HashMap<>();
	map.put("Codec name", codec.getName());
	map.put("Codec class name", codec.getClass().getName());
	map.put("Compound format", codec.compoundFormat().getClass().getName());
	map.put("DocValues format", codec.docValuesFormat().getClass().getName());
	map.put("FieldInfos format", codec.fieldInfosFormat().getClass().getName());
	map.put("LiveDocs format", codec.liveDocsFormat().getClass().getName());
	map.put("Norms format", codec.normsFormat().getClass().getName());
	map.put("Points format", codec.pointsFormat().getClass().getName());
	map.put("Postings format", codec.postingsFormat().getClass().getName());
	map.put("SegmentInfo format", codec.segmentInfoFormat().getClass().getName());
	map.put("StoredFields format", codec.storedFieldsFormat().getClass().getName());
	map.put("TermVectors format", codec.termVectorsFormat().getClass().getName());
	map.entrySet().stream()
	.map(entry -> entry.getKey() + " = " + entry.getValue()).forEach(detailsModel::addElement);
	});
	break;
	}
	segDetailList.setModel(detailsModel);

	}

	private class ListenerFunctions {

	void selectGeneration(ActionEvent e) {
	CommitsPanelProvider.this.selectGeneration();
	}

	void showSegmentDetails(MouseEvent e) {
	CommitsPanelProvider.this.showSegmentDetails();
	}

	}

	private class Observer implements IndexObserver, DirectoryObserver {

	@Override
	public void openDirectory(LukeState state) {
	commitsModel = commitsFactory.newInstance(state.getDirectory(), state.getIndexPath());
	populateCommitGenerations();
	}

	@Override
	public void closeDirectory() {
	close();
	}

	@Override
	public void openIndex(LukeState state) {
	if (state.hasDirectoryReader()) {
	DirectoryReader dr = (DirectoryReader) state.getIndexReader();
	commitsModel = commitsFactory.newInstance(dr, state.getIndexPath());
	populateCommitGenerations();
	}
	}

	@Override
	public void closeIndex() {
	close();
	}

	private void populateCommitGenerations() {
	DefaultComboBoxModel<Long> segGenList = new DefaultComboBoxModel<>();
	for (Commit commit : commitsModel.listCommits()) {
	segGenList.addElement(commit.getGeneration());
	}
	commitGenCombo.setModel(segGenList);

	if (segGenList.getSize() > 0) {
	commitGenCombo.setSelectedIndex(0);
	}
	}

	private void close() {
	commitsModel = null;

	commitGenCombo.setModel(new DefaultComboBoxModel<>());
	deletedLbl.setText("");
	segCntLbl.setText("");
	userDataTA.setText("");
	TableUtils.setupTable(filesTable, ListSelectionModel.SINGLE_SELECTION, new FilesTableModel(), null, FilesTableModel.Column.FILENAME.getColumnWidth());
	TableUtils.setupTable(segmentsTable, ListSelectionModel.SINGLE_SELECTION, new SegmentsTableModel(), null,
	SegmentsTableModel.Column.NAME.getColumnWidth(),
	SegmentsTableModel.Column.MAXDOCS.getColumnWidth(),
	SegmentsTableModel.Column.DELS.getColumnWidth(),
	SegmentsTableModel.Column.DELGEN.getColumnWidth(),
	SegmentsTableModel.Column.VERSION.getColumnWidth(),
	SegmentsTableModel.Column.CODEC.getColumnWidth());
	diagRB.setEnabled(false);
	attrRB.setEnabled(false);
	codecRB.setEnabled(false);
	segDetailList.setModel(new DefaultListModel<>());
	}
	}

	enum ActionCommand {
	DIAGNOSTICS, ATTRIBUTES, CODEC;
	}

	static final class FilesTableModel extends TableModelBase<FilesTableModel.Column> {

	enum Column implements TableColumnInfo {

	FILENAME("Filename", 0, String.class, 200),
	SIZE("Size", 1, String.class, Integer.MAX_VALUE);

	private final String colName;
	private final int index;
	private final Class<?> type;
	private final int width;

	Column(String colName, int index, Class<?> type, int width) {
	this.colName = colName;
	this.index = index;
	this.type = type;
	this.width = width;
	}

	@Override
	public String getColName() {
	return colName;
	}

	@Override
	public int getIndex() {
	return index;
	}

	@Override
	public Class<?> getType() {
	return type;
	}

	@Override
	public int getColumnWidth() {
	return width;
	}
	}

	FilesTableModel() {
	super();
	}

	FilesTableModel(List<File> files) {
	super(files.size());
	for (int i = 0; i < files.size(); i++) {
	File file = files.get(i);
	data[i][Column.FILENAME.getIndex()] = file.getFileName();
	data[i][Column.SIZE.getIndex()] = file.getDisplaySize();
	}
	}

	@Override
	protected Column[] columnInfos() {
	return Column.values();
	}
	}

	static final class SegmentsTableModel extends TableModelBase<SegmentsTableModel.Column> {

	enum Column implements TableColumnInfo {

	NAME("Name", 0, String.class, 60),
	MAXDOCS("Max docs", 1, Integer.class, 60),
	DELS("Dels", 2, Integer.class, 60),
	DELGEN("Del gen", 3, Long.class, 60),
	VERSION("Lucene ver.", 4, String.class, 60),
	CODEC("Codec", 5, String.class, 100),
	SIZE("Size", 6, String.class, 150);

	private final String colName;
	private final int index;
	private final Class<?> type;
	private final int width;

	Column(String colName, int index, Class<?> type, int width) {
	this.colName = colName;
	this.index = index;
	this.type = type;
	this.width = width;
	}

	@Override
	public String getColName() {
	return colName;
	}

	@Override
	public int getIndex() {
	return index;
	}

	@Override
	public Class<?> getType() {
	return type;
	}

	@Override
	public int getColumnWidth() {
	return width;
	}
	}

	SegmentsTableModel() {
	super();
	}

	SegmentsTableModel(List<Segment> segments) {
	super(segments.size());
	for (int i = 0; i < segments.size(); i++) {
	Segment segment = segments.get(i);
	data[i][Column.NAME.getIndex()] = segment.getName();
	data[i][Column.MAXDOCS.getIndex()] = segment.getMaxDoc();
	data[i][Column.DELS.getIndex()] = segment.getDelCount();
	data[i][Column.DELGEN.getIndex()] = segment.getDelGen();
	data[i][Column.VERSION.getIndex()] = segment.getLuceneVer();
	data[i][Column.CODEC.getIndex()] = segment.getCodecName();
	data[i][Column.SIZE.getIndex()] = segment.getDisplaySize();
	}
	}

	@Override
	protected Column[] columnInfos() {
	return Column.values();
	}
	}
	}