]> gitweb.fperrin.net Git - GpsPrune.git/blobdiff - src/tim/prune/correlate/Correlator.java
Moved source into separate src directory due to popular request
[GpsPrune.git] / src / tim / prune / correlate / Correlator.java
diff --git a/src/tim/prune/correlate/Correlator.java b/src/tim/prune/correlate/Correlator.java
new file mode 100644 (file)
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+package tim.prune.correlate;
+
+import java.awt.BorderLayout;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.FlowLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.Iterator;
+import java.util.TimeZone;
+import java.util.TreeSet;
+
+import javax.swing.BorderFactory;
+import javax.swing.BoxLayout;
+import javax.swing.ButtonGroup;
+import javax.swing.JButton;
+import javax.swing.JComboBox;
+import javax.swing.JDialog;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JRadioButton;
+import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.JTextField;
+
+import tim.prune.App;
+import tim.prune.GenericFunction;
+import tim.prune.I18nManager;
+import tim.prune.config.TimezoneHelper;
+import tim.prune.data.DataPoint;
+import tim.prune.data.Distance;
+import tim.prune.data.Field;
+import tim.prune.data.MediaObject;
+import tim.prune.data.MediaList;
+import tim.prune.data.TimeDifference;
+import tim.prune.data.Timestamp;
+import tim.prune.data.Track;
+import tim.prune.data.Unit;
+import tim.prune.data.UnitSetLibrary;
+import tim.prune.tips.TipManager;
+
+/**
+ * Abstract superclass of the two correlator functions
+ */
+public abstract class Correlator extends GenericFunction
+{
+       protected JDialog _dialog;
+       private CardStack _cards = null;
+       private JTable _selectionTable = null;
+       protected JTable _previewTable = null;
+       private boolean _previewEnabled = false; // flag required to enable preview function on final panel
+       private boolean[] _cardEnabled = null; // flag for each card
+       private TimeZone _timezone = null;
+       private JTextField _offsetHourBox = null, _offsetMinBox = null, _offsetSecBox = null;
+       private JRadioButton _mediaLaterOption = null, _pointLaterOption = null;
+       private JRadioButton _timeLimitRadio = null, _distLimitRadio = null;
+       private JTextField _limitMinBox = null, _limitSecBox = null;
+       private JTextField _limitDistBox = null;
+       private JComboBox<String> _distUnitsDropdown = null;
+       private JButton _nextButton = null, _backButton = null;
+       protected JButton _okButton = null;
+
+
+       /**
+        * Constructor
+        * @param inApp App object to report actions to
+        */
+       public Correlator(App inApp) {
+               super(inApp);
+       }
+
+       /**
+        * @return type key eg photo, audio
+        */
+       protected abstract String getMediaTypeKey();
+
+       /**
+        * @return media list
+        */
+       protected abstract MediaList getMediaList();
+
+       /**
+        * Begin the function by initialising and showing the dialog
+        */
+       public void begin()
+       {
+               // Check whether track has timestamps, exit if not
+               if (!_app.getTrackInfo().getTrack().hasData(Field.TIMESTAMP))
+               {
+                       JOptionPane.showMessageDialog(_parentFrame, I18nManager.getText("dialog.correlate.notimestamps"),
+                               I18nManager.getText(getNameKey()), JOptionPane.INFORMATION_MESSAGE);
+                       return;
+               }
+               // Show warning if no uncorrelated audios
+               if (!getMediaList().hasUncorrelatedMedia())
+               {
+                       Object[] buttonTexts = {I18nManager.getText("button.continue"), I18nManager.getText("button.cancel")};
+                       if (JOptionPane.showOptionDialog(_parentFrame,
+                                       I18nManager.getText("dialog.correlate.nouncorrelated" + getMediaTypeKey() + "s"),
+                                       I18nManager.getText(getNameKey()), JOptionPane.YES_NO_OPTION,
+                                       JOptionPane.WARNING_MESSAGE, null, buttonTexts, buttonTexts[1])
+                               == JOptionPane.NO_OPTION)
+                       {
+                               return;
+                       }
+               }
+               // Create dialog if necessary
+               if (_dialog == null)
+               {
+                       _dialog = new JDialog(_parentFrame, I18nManager.getText(getNameKey()), true);
+                       _dialog.setLocationRelativeTo(_parentFrame);
+                       _dialog.getContentPane().add(makeDialogContents());
+                       _dialog.pack();
+               }
+               _okButton.setEnabled(false);
+               // Init timezone to the currently selected one
+               _timezone = TimezoneHelper.getSelectedTimezone();
+               // Go to first available card
+               int card = 0;
+               _cardEnabled = null;
+               while (!isCardEnabled(card)) {
+                       card++;
+               }
+               _cards.showCard(card);
+               showCard(0); // does set up and next/prev enabling
+               if (!isCardEnabled(1)) {
+                       _app.showTip(TipManager.Tip_ManuallyCorrelateOne);
+               }
+               _dialog.setVisible(true);
+       }
+
+       /**
+        * Make contents of correlate dialog
+        * @return JPanel containing gui elements
+        */
+       private JPanel makeDialogContents()
+       {
+               JPanel mainPanel = new JPanel();
+               mainPanel.setLayout(new BorderLayout());
+
+               // Card panel in the middle
+               _cards = new CardStack();
+
+               // First panel (not required by photo correlator)
+               JPanel card1 = makeFirstPanel();
+               if (card1 == null) {card1 = new JPanel();}
+               _cards.addCard(card1);
+
+               // Second panel for selection of linked media
+               _cards.addCard(makeSecondPanel());
+
+               // Third panel for options and preview
+               _cards.addCard(makeThirdPanel());
+               mainPanel.add(_cards, BorderLayout.CENTER);
+
+               // Button panel at the bottom
+               JPanel buttonPanel = new JPanel();
+               _backButton = new JButton(I18nManager.getText("button.back"));
+               _backButton.addActionListener(new ActionListener() {
+                       public void actionPerformed(ActionEvent e) {
+                               showCard(-1);
+                       }
+               });
+               _backButton.setEnabled(false);
+               buttonPanel.add(_backButton);
+               _nextButton = new JButton(I18nManager.getText("button.next"));
+               _nextButton.addActionListener(new ActionListener() {
+                       public void actionPerformed(ActionEvent e) {
+                               showCard(1);
+                       }
+               });
+               buttonPanel.add(_nextButton);
+               _okButton = new JButton(I18nManager.getText("button.ok"));
+               _okButton.addActionListener(new ActionListener()
+                       {
+                               public void actionPerformed(ActionEvent e)
+                               {
+                                       finishCorrelation();
+                                       _dialog.dispose();
+                               }
+                       });
+               _okButton.setEnabled(false);
+               buttonPanel.add(_okButton);
+               JButton cancelButton = new JButton(I18nManager.getText("button.cancel"));
+               cancelButton.addActionListener(new ActionListener() {
+                       public void actionPerformed(ActionEvent e) {
+                               _dialog.dispose();
+                       }
+               });
+               buttonPanel.add(cancelButton);
+               mainPanel.add(buttonPanel, BorderLayout.SOUTH);
+               return mainPanel;
+       }
+
+       /**
+        * Construct a table model for the photo / audio selection table
+        * @return table model
+        */
+       protected MediaSelectionTableModel makeSelectionTableModel()
+       {
+               MediaList mediaList = getMediaList();
+               MediaSelectionTableModel model = new MediaSelectionTableModel(
+                       "dialog.correlate.select." + getMediaTypeKey() + "name",
+                       "dialog.correlate.select." + getMediaTypeKey() + "later");
+               int numMedia = mediaList.getNumMedia();
+               for (int i=0; i<numMedia; i++)
+               {
+                       MediaObject media = mediaList.getMedia(i);
+                       // For working out time differences, can't use media which already had point information
+                       if (media.getDataPoint() != null && media.getDataPoint().hasTimestamp()
+                               && media.getOriginalStatus() == MediaObject.Status.NOT_CONNECTED)
+                       {
+                               // Calculate time difference, add to table model
+                               long timeDiff = getMediaTimestamp(media).getSecondsSince(media.getDataPoint().getTimestamp(), _timezone);
+                               model.addMedia(media, timeDiff);
+                       }
+               }
+               return model;
+       }
+
+       /**
+        * Group the two radio buttons together with a ButtonGroup
+        * @param inButton1 first radio button
+        * @param inButton2 second radio button
+        */
+       protected static void groupRadioButtons(JRadioButton inButton1, JRadioButton inButton2)
+       {
+               ButtonGroup buttonGroup = new ButtonGroup();
+               buttonGroup.add(inButton1);
+               buttonGroup.add(inButton2);
+               inButton1.setSelected(true);
+       }
+
+
+       /**
+        * Try to parse the given string
+        * @param inText String to parse
+        * @return value if parseable, 0 otherwise
+        */
+       protected static int getValue(String inText)
+       {
+               int value = 0;
+               try {
+                       value = Integer.parseInt(inText);
+               }
+               catch (NumberFormatException nfe) {}
+               return value;
+       }
+
+
+       /**
+        * Calculate the median index to select from the table
+        * @param inModel table model
+        * @return index of entry to select from table
+        */
+       protected static int getMedianIndex(MediaSelectionTableModel inModel)
+       {
+               // make sortable list
+               TreeSet<TimeIndexPair> set = new TreeSet<TimeIndexPair>();
+               // loop through rows of table adding to list
+               int numRows = inModel.getRowCount();
+               int i;
+               for (i=0; i<numRows; i++)
+               {
+                       MediaSelectionTableRow row = inModel.getRow(i);
+                       set.add(new TimeIndexPair(row.getTimeDiff().getTotalSeconds(), i));
+               }
+               // pull out middle entry and return index
+               TimeIndexPair pair = null;
+               Iterator<TimeIndexPair> iterator = set.iterator();
+               for (i=0; i<(numRows+1)/2; i++)
+               {
+                       pair = iterator.next();
+               }
+               return pair.getIndex();
+       }
+
+
+       /**
+        * Disable the ok button
+        */
+       public void disableOkButton()
+       {
+               if (_okButton != null) {
+                       _okButton.setEnabled(false);
+               }
+       }
+
+       /**
+        * @return gui components for first panel, or null if empty
+        */
+       protected JPanel makeFirstPanel() {
+               return null;
+       }
+
+       /**
+        * Make the second panel for the selection screen
+        * @return JPanel object containing gui elements
+        */
+       private JPanel makeSecondPanel()
+       {
+               JPanel card = new JPanel();
+               card.setLayout(new BorderLayout(10, 10));
+               JLabel introLabel = new JLabel(I18nManager.getText(
+                       "dialog.correlate." + getMediaTypeKey() + "select.intro"));
+               introLabel.setBorder(BorderFactory.createEmptyBorder(6, 6, 6, 6));
+               card.add(introLabel, BorderLayout.NORTH);
+               // table doesn't have model yet - that will be attached later
+               _selectionTable = new JTable();
+               JScrollPane photoScrollPane = new JScrollPane(_selectionTable);
+               photoScrollPane.setPreferredSize(new Dimension(400, 100));
+               card.add(photoScrollPane, BorderLayout.CENTER);
+               return card;
+       }
+
+
+       /**
+        * Make contents of third panel including options and preview
+        * @return JPanel containing gui elements
+        */
+       private JPanel makeThirdPanel()
+       {
+               OptionsChangedListener optionsChangedListener = new OptionsChangedListener(this);
+               // Second panel for options
+               JPanel card2 = new JPanel();
+               card2.setLayout(new BorderLayout());
+               JPanel card2Top = new JPanel();
+               card2Top.setLayout(new BoxLayout(card2Top, BoxLayout.Y_AXIS));
+               JLabel introLabel = new JLabel(I18nManager.getText("dialog.correlate.options.intro"));
+               introLabel.setBorder(BorderFactory.createEmptyBorder(8, 6, 5, 6));
+               card2Top.add(introLabel);
+               // time offset section
+               JPanel offsetPanel = new JPanel();
+               offsetPanel.setBorder(BorderFactory.createTitledBorder(I18nManager.getText("dialog.correlate.options.offsetpanel")));
+               offsetPanel.setLayout(new BoxLayout(offsetPanel, BoxLayout.Y_AXIS));
+               JPanel offsetPanelTop = new JPanel();
+               offsetPanelTop.setLayout(new FlowLayout());
+               offsetPanelTop.setBorder(null);
+               offsetPanelTop.add(new JLabel(I18nManager.getText("dialog.correlate.options.offset") + ": "));
+               _offsetHourBox = new JTextField(3);
+               _offsetHourBox.addKeyListener(optionsChangedListener);
+               offsetPanelTop.add(_offsetHourBox);
+               offsetPanelTop.add(new JLabel(I18nManager.getText("dialog.correlate.options.offset.hours")));
+               _offsetMinBox = new JTextField(3);
+               _offsetMinBox.addKeyListener(optionsChangedListener);
+               offsetPanelTop.add(_offsetMinBox);
+               offsetPanelTop.add(new JLabel(I18nManager.getText("dialog.correlate.options.offset.minutes")));
+               _offsetSecBox = new JTextField(3);
+               _offsetSecBox.addKeyListener(optionsChangedListener);
+               offsetPanelTop.add(_offsetSecBox);
+               offsetPanelTop.add(new JLabel(I18nManager.getText("dialog.correlate.options.offset.seconds")));
+               offsetPanel.add(offsetPanelTop);
+
+               // radio buttons for photo / point later
+               JPanel offsetPanelBot = new JPanel();
+               offsetPanelBot.setLayout(new FlowLayout());
+               offsetPanelBot.setBorder(null);
+               _mediaLaterOption = new JRadioButton(I18nManager.getText("dialog.correlate.options." + getMediaTypeKey() + "later"));
+               _pointLaterOption = new JRadioButton(I18nManager.getText("dialog.correlate.options.pointlater" + getMediaTypeKey()));
+               _mediaLaterOption.addItemListener(optionsChangedListener);
+               _pointLaterOption.addItemListener(optionsChangedListener);
+               ButtonGroup laterGroup = new ButtonGroup();
+               laterGroup.add(_mediaLaterOption);
+               laterGroup.add(_pointLaterOption);
+               offsetPanelBot.add(_mediaLaterOption);
+               offsetPanelBot.add(_pointLaterOption);
+               offsetPanel.add(offsetPanelBot);
+               offsetPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
+               card2Top.add(offsetPanel);
+
+               // listener for radio buttons
+               ActionListener radioListener = new ActionListener() {
+                       public void actionPerformed(ActionEvent e) {
+                               enableEditBoxes();
+                       }
+               };
+               // time limits section
+               JPanel limitsPanel = new JPanel();
+               limitsPanel.setBorder(BorderFactory.createTitledBorder(I18nManager.getText("dialog.correlate.options.limitspanel")));
+               limitsPanel.setLayout(new BoxLayout(limitsPanel, BoxLayout.Y_AXIS));
+               JPanel timeLimitPanel = new JPanel();
+               timeLimitPanel.setLayout(new FlowLayout());
+               JRadioButton noTimeLimitRadio = new JRadioButton(I18nManager.getText("dialog.correlate.options.notimelimit"));
+               noTimeLimitRadio.addItemListener(optionsChangedListener);
+               noTimeLimitRadio.addActionListener(radioListener);
+               timeLimitPanel.add(noTimeLimitRadio);
+               _timeLimitRadio = new JRadioButton(I18nManager.getText("dialog.correlate.options.timelimit") + ": ");
+               _timeLimitRadio.addItemListener(optionsChangedListener);
+               _timeLimitRadio.addActionListener(radioListener);
+               timeLimitPanel.add(_timeLimitRadio);
+               groupRadioButtons(noTimeLimitRadio, _timeLimitRadio);
+               _limitMinBox = new JTextField(3);
+               _limitMinBox.addKeyListener(optionsChangedListener);
+               timeLimitPanel.add(_limitMinBox);
+               timeLimitPanel.add(new JLabel(I18nManager.getText("dialog.correlate.options.offset.minutes")));
+               _limitSecBox = new JTextField(3);
+               _limitSecBox.addKeyListener(optionsChangedListener);
+               timeLimitPanel.add(_limitSecBox);
+               timeLimitPanel.add(new JLabel(I18nManager.getText("dialog.correlate.options.offset.seconds")));
+               limitsPanel.add(timeLimitPanel);
+               // distance limits
+               JPanel distLimitPanel = new JPanel();
+               distLimitPanel.setLayout(new FlowLayout());
+               JRadioButton noDistLimitRadio = new JRadioButton(I18nManager.getText("dialog.correlate.options.nodistancelimit"));
+               noDistLimitRadio.addItemListener(optionsChangedListener);
+               noDistLimitRadio.addActionListener(radioListener);
+               distLimitPanel.add(noDistLimitRadio);
+               _distLimitRadio = new JRadioButton(I18nManager.getText("dialog.correlate.options.distancelimit") + ": ");
+               _distLimitRadio.addItemListener(optionsChangedListener);
+               _distLimitRadio.addActionListener(radioListener);
+               distLimitPanel.add(_distLimitRadio);
+               groupRadioButtons(noDistLimitRadio, _distLimitRadio);
+               _limitDistBox = new JTextField(4);
+               _limitDistBox.addKeyListener(optionsChangedListener);
+               distLimitPanel.add(_limitDistBox);
+               String[] distUnitsOptions = {I18nManager.getText("units.kilometres"), I18nManager.getText("units.metres"),
+                       I18nManager.getText("units.miles")};
+               _distUnitsDropdown = new JComboBox<String>(distUnitsOptions);
+               _distUnitsDropdown.addItemListener(optionsChangedListener);
+               distLimitPanel.add(_distUnitsDropdown);
+               limitsPanel.add(distLimitPanel);
+               limitsPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
+               card2Top.add(limitsPanel);
+
+               // preview button
+               JButton previewButton = new JButton(I18nManager.getText("button.preview"));
+               previewButton.addActionListener(new ActionListener() {
+                       public void actionPerformed(ActionEvent e) {
+                               createPreview(true);
+                       }
+               });
+               card2Top.add(previewButton);
+               card2.add(card2Top, BorderLayout.NORTH);
+               // preview
+               _previewTable = new JTable(new MediaPreviewTableModel("dialog.correlate.select." + getMediaTypeKey() + "name"));
+               JScrollPane previewScrollPane = new JScrollPane(_previewTable);
+               previewScrollPane.setPreferredSize(new Dimension(300, 100));
+               card2.add(previewScrollPane, BorderLayout.CENTER);
+               return card2;
+       }
+
+
+       /**
+        * Go to the next or previous card in the stack
+        * @param increment 1 for next, -1 for previous card
+        */
+       private void showCard(int increment)
+       {
+               int currCard = _cards.getCurrentCardIndex();
+               int next = currCard + increment;
+               if (!isCardEnabled(next)) {
+                       next += increment;
+               }
+               setupCard(next);
+               _backButton.setEnabled(next > 0 && (isCardEnabled(next-1) || isCardEnabled(next-2)));
+               _nextButton.setEnabled(next < (_cards.getNumCards()-1));
+               _cards.showCard(next);
+       }
+
+       /**
+        * @param inCardNum index of card
+        * @return true if specified card is enabled
+        */
+       private boolean isCardEnabled(int inCardNum)
+       {
+               if (_cardEnabled == null) {
+                       _cardEnabled = getCardEnabledFlags();
+               }
+               return (inCardNum >= 0 && inCardNum < _cardEnabled.length && _cardEnabled[inCardNum]);
+       }
+
+       /**
+        * @return array of boolean flags denoting availability of cards
+        */
+       protected boolean[] getCardEnabledFlags()
+       {
+               // by default first is off and third is always on; second depends on selection table
+               return new boolean[] {false, makeSelectionTableModel().getRowCount() > 0, true};
+       }
+
+       /**
+        * Set up the specified card
+        * @param inCardNum index of card
+        */
+       protected void setupCard(int inCardNum)
+       {
+               _previewEnabled = false;
+               if (inCardNum == 1)
+               {
+                       // set up photo selection card
+                       MediaSelectionTableModel model = makeSelectionTableModel();
+                       _selectionTable.setModel(model);
+                       for (int i=0; i<model.getColumnCount(); i++) {
+                               _selectionTable.getColumnModel().getColumn(i).setPreferredWidth(i==3?50:150);
+                       }
+                       // Calculate median time difference, select corresponding row of table
+                       int preselectedIndex = model.getRowCount() < 3 ? 0 : getMedianIndex(model);
+                       _selectionTable.getSelectionModel().setSelectionInterval(preselectedIndex, preselectedIndex);
+                       _nextButton.requestFocus();
+               }
+               else if (inCardNum == 2)
+               {
+                       // set up the options/preview card - first check for given time difference
+                       TimeDifference timeDiff = null;
+                       if (isCardEnabled(1))
+                       {
+                               int rowNum = _selectionTable.getSelectedRow();
+                               if (rowNum < 0) {rowNum = 0;}
+                               MediaSelectionTableRow selectedRow =
+                                       ((MediaSelectionTableModel) _selectionTable.getModel()).getRow(rowNum);
+                               timeDiff = selectedRow.getTimeDiff();
+                       }
+                       setupPreviewCard(timeDiff, getMediaList().getMedia(0));
+               }
+               // enable ok button if any photos have been selected
+               _okButton.setEnabled(inCardNum == 2 && ((MediaPreviewTableModel) _previewTable.getModel()).hasAnySelected());
+       }
+
+       /**
+        * Enable or disable the edit boxes according to the radio button selections
+        */
+       private void enableEditBoxes()
+       {
+               // enable/disable text field for distance input
+               _limitDistBox.setEnabled(_distLimitRadio.isSelected());
+               // and for time limits
+               _limitMinBox.setEnabled(_timeLimitRadio.isSelected());
+               _limitSecBox.setEnabled(_timeLimitRadio.isSelected());
+       }
+
+       /**
+        * Parse the time limit values entered and validate them
+        * @return TimeDifference object describing limit
+        */
+       protected TimeDifference parseTimeLimit()
+       {
+               if (!_timeLimitRadio.isSelected()) {return null;}
+               int mins = getValue(_limitMinBox.getText());
+               _limitMinBox.setText("" + mins);
+               int secs = getValue(_limitSecBox.getText());
+               _limitSecBox.setText("" + secs);
+               if (mins <= 0 && secs <= 0) {return null;}
+               return new TimeDifference(0, mins, secs, true);
+       }
+
+       /**
+        * Parse the distance limit value entered and validate
+        * @return angular distance in radians
+        */
+       protected double parseDistanceLimit()
+       {
+               double value = -1.0;
+               if (_distLimitRadio.isSelected())
+               {
+                       try {
+                               value = Double.parseDouble(_limitDistBox.getText());
+                       }
+                       catch (NumberFormatException nfe) {}
+               }
+               if (value <= 0.0) {
+                       _limitDistBox.setText("0");
+                       return -1.0;
+               }
+               _limitDistBox.setText("" + value);
+               return Distance.convertDistanceToRadians(value, getSelectedDistanceUnits());
+       }
+
+
+       /**
+        * @return the selected distance units from the dropdown
+        */
+       protected Unit getSelectedDistanceUnits()
+       {
+               final Unit[] distUnits = {UnitSetLibrary.UNITS_KILOMETRES, UnitSetLibrary.UNITS_METRES, UnitSetLibrary.UNITS_MILES};
+               return distUnits[_distUnitsDropdown.getSelectedIndex()];
+       }
+
+       /**
+        * Create a preview of the correlate action using the selected time difference
+        * @param inFromButton true if triggered from button press, false if automatic
+        */
+       public void createPreview(boolean inFromButton)
+       {
+               // Exit if still on first panel
+               if (!_previewEnabled) {
+                       return;
+               }
+               // Create a TimeDifference based on the edit boxes
+               int numHours = getValue(_offsetHourBox.getText());
+               int numMins = getValue(_offsetMinBox.getText());
+               int numSecs = getValue(_offsetSecBox.getText());
+               boolean isPos = _mediaLaterOption.isSelected();
+               createPreview(new TimeDifference(numHours, numMins, numSecs, isPos), inFromButton);
+       }
+
+       /**
+        * Set up the final card using the given time difference and show it
+        * @param inTimeDiff time difference to use for time offsets
+        * @param inFirstMedia first media object to use for calculating timezone
+        */
+       protected void setupPreviewCard(TimeDifference inTimeDiff, MediaObject inFirstMedia)
+       {
+               _previewEnabled = false;
+               TimeDifference timeDiff = inTimeDiff;
+               if (timeDiff == null)
+               {
+                       // No time difference available, so try with zero
+                       timeDiff = new TimeDifference(0L);
+               }
+               // Use time difference to set edit boxes
+               _offsetHourBox.setText("" + timeDiff.getNumHours());
+               _offsetMinBox.setText("" + timeDiff.getNumMinutes());
+               _offsetSecBox.setText("" + timeDiff.getNumSeconds());
+               _mediaLaterOption.setSelected(timeDiff.getIsPositive());
+               _pointLaterOption.setSelected(!timeDiff.getIsPositive());
+               _previewEnabled = true;
+               enableEditBoxes();
+               createPreview(timeDiff, true);
+       }
+
+       /**
+        * Create a preview of the correlate action using the selected time difference
+        * @param inTimeDiff TimeDifference to use for preview
+        * @param inShowWarning true to show warning if all points out of range
+        */
+       protected abstract void createPreview(TimeDifference inTimeDiff, boolean inShowWarning);
+
+
+       /**
+        * Get the timestamp of the given media
+        * @param inMedia media object
+        * @return normally just returns the media timestamp, overridden by audio correlator
+        */
+       protected Timestamp getMediaTimestamp(MediaObject inMedia)
+       {
+               return inMedia.getTimestamp();
+       }
+
+       /**
+        * Get the point pair surrounding the given media item
+        * @param inTrack track object
+        * @param inMedia media object
+        * @param inOffset time offset to apply
+        * @return point pair resulting from correlation
+        */
+       protected PointMediaPair getPointPairForMedia(Track inTrack, MediaObject inMedia, TimeDifference inOffset)
+       {
+               PointMediaPair pair = new PointMediaPair(inMedia);
+               if (inMedia.hasTimestamp())
+               {
+                       // Add/subtract offset to media timestamp
+                       Timestamp mediaStamp = getMediaTimestamp(inMedia);
+                       int numPoints = inTrack.getNumPoints();
+                       for (int i=0; i<numPoints; i++)
+                       {
+                               DataPoint point = inTrack.getPoint(i);
+                               if (point.getPhoto() == null && point.getAudio() == null)
+                               {
+                                       Timestamp pointStamp = point.getTimestamp();
+                                       if (pointStamp != null && pointStamp.isValid())
+                                       {
+                                               long numSeconds = pointStamp.getSecondsSince(mediaStamp, _timezone)
+                                                       + inOffset.getTotalSeconds();
+                                               pair.addPoint(point, numSeconds);
+                                       }
+                               }
+                       }
+               }
+               return pair;
+       }
+
+
+       /**
+        * Finish the correlation
+        */
+       protected abstract void finishCorrelation();
+
+       /**
+        * Construct an array of the point pairs to use for correlation
+        * @return array of PointMediaPair objects
+        */
+       protected PointMediaPair[] getPointPairs()
+       {
+               MediaPreviewTableModel model = (MediaPreviewTableModel) _previewTable.getModel();
+               int numMedia = model.getRowCount();
+               PointMediaPair[] pairs = new PointMediaPair[numMedia];
+               // Loop over items in preview table model
+               for (int i=0; i<numMedia; i++)
+               {
+                       MediaPreviewTableRow row = model.getRow(i);
+                       // add all selected pairs to array (other elements remain null)
+                       if (row.getCorrelateFlag().booleanValue()) {
+                               pairs[i] = row.getPointPair();
+                       }
+               }
+               return pairs;
+       }
+}