new abstract proxy for use by applet and application
authorjprocter <Jim Procter>
Tue, 29 Jun 2010 16:19:32 +0000 (16:19 +0000)
committerjprocter <Jim Procter>
Tue, 29 Jun 2010 16:19:32 +0000 (16:19 +0000)
src/jalview/ext/jmol/JalviewJmolBinding.java [new file with mode: 0644]

diff --git a/src/jalview/ext/jmol/JalviewJmolBinding.java b/src/jalview/ext/jmol/JalviewJmolBinding.java
new file mode 100644 (file)
index 0000000..fbd7176
--- /dev/null
@@ -0,0 +1,824 @@
+/*
+ * Jalview - A Sequence Alignment Editor and Viewer (Version 2.5)
+ * Copyright (C) 2010 J Procter, AM Waterhouse, G Barton, M Clamp, S Searle
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview 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 (at your option) any later version.
+ * 
+ * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package jalview.ext.jmol;
+
+import java.util.*;
+import java.awt.*;
+import java.awt.event.*;
+
+import jalview.api.FeatureRenderer;
+import jalview.api.SequenceRenderer;
+import jalview.api.SequenceStructureBinding;
+import jalview.datamodel.*;
+import jalview.structure.*;
+import jalview.io.*;
+
+import org.jmol.api.*;
+import org.jmol.adapter.smarter.SmarterJmolAdapter;
+
+import org.jmol.popup.*;
+import org.jmol.viewer.JmolConstants;
+
+import jalview.schemes.*;
+
+public abstract class JalviewJmolBinding implements StructureListener,
+        JmolStatusListener, SequenceStructureBinding
+
+{
+
+  boolean allChainsSelected = false;
+
+  /**
+   * when true, try to search the associated datamodel for sequences that are
+   * associated with any unknown structures in the Jmol view.
+   */
+  private boolean associateNewStructs = false;
+
+  Vector atomsPicked = new Vector();
+
+  private Vector chainNames;
+
+  String[] chains;
+
+  boolean colourBySequence = true;
+
+  StringBuffer eval = new StringBuffer();
+
+  String fileLoadingError;
+
+  /**
+   * the default or current model displayed if the model cannot be identified
+   * from the selection message
+   */
+  int frameNo = 0;
+
+  JmolPopup jmolpopup;
+
+  String lastCommand;
+
+  String lastMessage;
+
+  boolean loadedInline;
+
+  /**
+   * current set of model filenames loaded in the Jmol instance
+   */
+  String[] modelFileNames = null;
+
+  PDBEntry[] pdbentry;
+
+  /**
+   * datasource protocol for access to PDBEntry
+   */
+  String protocol = null;
+
+  StringBuffer resetLastRes = new StringBuffer();
+
+  SequenceI[] sequence;
+
+  StructureSelectionManager ssm;
+
+  JmolViewer viewer;
+
+  public JalviewJmolBinding(PDBEntry[] pdbentry, SequenceI[] seq,
+          String[] chains, String protocol)
+  {
+    /*
+     * viewer = JmolViewer.allocateViewer(renderPanel, new SmarterJmolAdapter(),
+     * "jalviewJmol", ap.av.applet .getDocumentBase(),
+     * ap.av.applet.getCodeBase(), "", this);
+     * 
+     * jmolpopup = JmolPopup.newJmolPopup(viewer, true, "Jmol", true);
+     */
+  }
+
+  /**
+   * prepare the view for a given set of models/chains. chainList contains
+   * strings of the form 'pdbfilename:Chaincode'
+   * 
+   * @param chainList
+   *          list of chains to make visible
+   */
+  void centerViewer(Vector chainList)
+  {
+    StringBuffer cmd = new StringBuffer();
+    String lbl;
+    int mlength, p;
+    for (int i = 0, iSize = chainList.size(); i < iSize; i++)
+    {
+      mlength = 0;
+      lbl = (String) chainList.elementAt(i);
+      do
+      {
+        p = mlength;
+        mlength = lbl.indexOf(":", p);
+      } while (p < mlength && mlength < (lbl.length() - 2));
+      cmd.append(":" + lbl.substring(mlength + 1) + " /"
+              + getModelNum(lbl.substring(0, mlength)) + " or ");
+    }
+    if (cmd.length() > 0)
+      cmd.setLength(cmd.length() - 4);
+
+    jmolHistory(false);
+    viewer
+            .evalString("select *;restrict " + cmd + ";cartoon;center "
+                    + cmd);
+    jmolHistory(true);
+  }
+
+  void closeViewer()
+  {
+    viewer.setModeMouse(org.jmol.viewer.JmolConstants.MOUSE_NONE);
+    // remove listeners for all structures in viewer
+    StructureSelectionManager.getStructureSelectionManager()
+            .removeStructureViewerListener(this, this.getPdbFile());
+    // and shut down jmol
+    viewer.evalStringQuiet("zap");
+    viewer.setJmolStatusListener(null);
+
+    viewer = null;
+  }
+
+  public void colourByChain()
+  {
+    jmolHistory(false);
+    colourBySequence = false;
+    viewer.evalStringQuiet("select *;color chain");
+    jmolHistory(true);
+  } 
+
+  public void colourByCharge()
+  {
+    jmolHistory(false);
+    colourBySequence = false;
+    viewer.evalStringQuiet("select *;color white;select ASP,GLU;color red;"
+            + "select LYS,ARG;color blue;select CYS;color yellow");
+    jmolHistory(true);
+  }
+
+  /**
+   * colour any structures associated with sequences in the given alignment
+   * using the getFeatureRenderer() and getSequenceRenderer() renderers but only
+   * if colourBySequence is enabled.
+   */
+  public void colourBySequence(boolean showFeatures, AlignmentI alignment)
+  {
+    if (!colourBySequence)
+      return;
+    String[] files = getPdbFile();
+    SequenceRenderer sr = getSequenceRenderer();
+
+    FeatureRenderer fr = null;
+    if (showFeatures)
+    {
+      fr = getFeatureRenderer();
+    }
+
+    StringBuffer command = new StringBuffer();
+
+    for (int pdbfnum = 0; pdbfnum < files.length; pdbfnum++)
+    {
+      StructureMapping[] mapping = ssm.getMapping(files[pdbfnum]);
+
+      if (mapping == null || mapping.length < 1)
+        continue;
+
+      int lastPos = -1;
+      for (int s = 0; s < sequence.length; s++)
+      {
+        for (int sp, m = 0; m < mapping.length; m++)
+        {
+          if (mapping[m].getSequence() == sequence[s]
+                  && (sp = alignment.findIndex(sequence[s])) > -1)
+          {
+            SequenceI asp = alignment.getSequenceAt(sp);
+            for (int r = 0; r < asp.getLength(); r++)
+            {
+              // no mapping to gaps in sequence
+              if (jalview.util.Comparison.isGap(asp.getCharAt(r)))
+              {
+                continue;
+              }
+              int pos = mapping[m].getPDBResNum(asp.findPosition(r));
+
+              if (pos < 1 || pos == lastPos)
+                continue;
+
+              lastPos = pos;
+
+              Color col = sr.getResidueBoxColour(sequence[s], r);
+
+              if (showFeatures)
+                col = fr.findFeatureColour(col, sequence[s], r);
+              String newSelcom = (mapping[m].getChain() != " " ? ":"
+                      + mapping[m].getChain() : "")
+                      + "/"
+                      + (pdbfnum + 1)
+                      + ".1"
+                      + ";color["
+                      + col.getRed()
+                      + ","
+                      + col.getGreen()
+                      + ","
+                      + col.getBlue() + "]";
+              if (command.toString().endsWith(newSelcom))
+              {
+                command = condenseCommand(command.toString(), pos);
+                continue;
+              }
+              // TODO: deal with case when buffer is too large for Jmol to parse
+              // - execute command and flush
+
+              command.append(";select " + pos);
+              command.append(newSelcom);
+            }
+            break;
+          }
+        }
+      }
+    }
+
+    jmolHistory(false);
+    if (lastCommand == null || !lastCommand.equals(command.toString()))
+    {
+      viewer.evalStringQuiet(command.toString());
+    }
+    jmolHistory(true);
+    lastCommand = command.toString();
+  }
+
+  StringBuffer condenseCommand(String command, int pos)
+  {
+
+    StringBuffer sb = new StringBuffer(command.substring(0, command
+            .lastIndexOf("select") + 7));
+
+    command = command.substring(sb.length());
+
+    String start;
+
+    if (command.indexOf("-") > -1)
+    {
+      start = command.substring(0, command.indexOf("-"));
+    }
+    else
+    {
+      start = command.substring(0, command.indexOf(":"));
+    }
+
+    sb.append(start + "-" + pos + command.substring(command.indexOf(":")));
+
+    return sb;
+  }
+
+  public void createImage(String file, String type, int quality)
+  {
+  }
+
+  public String createImage(String fileName, String type,
+          Object textOrBytes, int quality)
+  {
+    // TODO Auto-generated method stub
+    return null;
+  }
+
+  public String eval(String strEval)
+  {
+    // System.out.println(strEval);
+    // "# 'eval' is implemented only for the applet.";
+    return null;
+  }
+
+  // End StructureListener
+  // //////////////////////////
+
+  public float[][] functionXY(String functionName, int x, int y)
+  {
+    return null;
+  }
+
+  public float[][][] functionXYZ(String functionName, int nx, int ny, int nz)
+  {
+    // TODO Auto-generated method stub
+    return null;
+  }
+
+  public Color getColour(int atomIndex, int pdbResNum, String chain,
+          String pdbfile)
+  {
+    if (getModelNum(pdbfile) < 0)
+      return null;
+    // TODO: verify atomIndex is selecting correct model.
+    return new Color(viewer.getAtomArgb(atomIndex));
+  }
+
+  /**
+   * returns the current featureRenderer that should be used to colour the
+   * structures
+   * 
+   * @return
+   */
+  abstract FeatureRenderer getFeatureRenderer();
+
+  private int getModelNum(String modelFileName)
+  {
+    String[] mfn = getPdbFile();
+    if (mfn == null)
+    {
+      return -1;
+    }
+    for (int i = 0; i < mfn.length; i++)
+    {
+      if (mfn[i].equalsIgnoreCase(modelFileName))
+        return i;
+    }
+    return -1;
+  }
+
+  // ////////////////////////////////
+  // /StructureListener
+  public String[] getPdbFile()
+  {
+    if (modelFileNames == null)
+    {
+      String mset[] = new String[viewer.getModelCount()];
+      for (int i = 0; i < mset.length; i++)
+      {
+        mset[i] = viewer.getModelFileName(i);
+      }
+      modelFileNames = mset;
+    }
+    return modelFileNames;
+  }
+
+  public Hashtable getRegistryInfo()
+  {
+    // TODO Auto-generated method stub
+    return null;
+  }
+
+  /**
+   * returns the current sequenceRenderer that should be used to colour the
+   * structures
+   * 
+   * @return
+   */
+  abstract SequenceRenderer getSequenceRenderer();
+
+  // ///////////////////////////////
+  // JmolStatusListener
+
+  public void handlePopupMenu(int x, int y)
+  {
+    jmolpopup.show(x, y);
+  }
+
+  // jmol/ssm only
+  public void highlightAtom(int atomIndex, int pdbResNum, String chain,
+          String pdbfile)
+  {
+    if (modelFileNames == null)
+    {
+      return;
+    }
+
+    // look up file model number for this pdbfile
+    int mdlNum = 0;
+    String fn;
+    // may need to adjust for URLencoding here - we don't worry about that yet.
+    while (mdlNum < modelFileNames.length
+            && !pdbfile.equals(modelFileNames[mdlNum]))
+    {
+      // System.out.println("nomatch:"+pdbfile+"\nmodelfn:"+fn);
+      mdlNum++;
+    }
+    if (mdlNum == modelFileNames.length)
+    {
+      return;
+    }
+
+    jmolHistory(false);
+    // if (!pdbfile.equals(pdbentry.getFile()))
+    // return;
+    if (resetLastRes.length() > 0)
+    {
+      viewer.evalStringQuiet(resetLastRes.toString());
+    }
+
+    eval.setLength(0);
+    eval.append("select " + pdbResNum); // +modelNum
+
+    resetLastRes.setLength(0);
+    resetLastRes.append("select " + pdbResNum); // +modelNum
+
+    eval.append(":");
+    resetLastRes.append(":");
+    if (!chain.equals(" "))
+    {
+      eval.append(chain);
+      resetLastRes.append(chain);
+    }
+    {
+      eval.append(" /" + (mdlNum + 1));
+      resetLastRes.append("/" + (mdlNum + 1));
+    }
+    eval.append(";wireframe 100;" + eval.toString() + " and not hetero;");
+
+    resetLastRes.append(";wireframe 0;" + resetLastRes.toString()
+            + " and not hetero; spacefill 0;");
+
+    eval.append("spacefill 200;select none");
+
+    viewer.evalStringQuiet(eval.toString());
+    jmolHistory(true);
+
+  }
+
+  private void jmolHistory(boolean enable)
+  {
+    viewer.setBooleanProperty("history", enable);
+  }
+
+  public void loadInline(String string)
+  {
+    loadedInline = true;
+    viewer.openStringInline(string);
+  }
+
+  public void mouseOverStructure(int atomIndex, String strInfo)
+  {
+    int pdbResNum;
+    int mdlSep = strInfo.indexOf("/");
+    int chainSeparator = strInfo.indexOf(":"), chainSeparator1 = -1;
+
+    if (chainSeparator == -1)
+    {
+      chainSeparator = strInfo.indexOf(".");
+      if (mdlSep > -1 && mdlSep < chainSeparator)
+      {
+        chainSeparator1 = chainSeparator;
+        chainSeparator = mdlSep;
+      }
+    }
+    pdbResNum = Integer.parseInt(strInfo.substring(
+            strInfo.indexOf("]") + 1, chainSeparator));
+
+    String chainId;
+
+    if (strInfo.indexOf(":") > -1)
+      chainId = strInfo.substring(strInfo.indexOf(":") + 1, strInfo
+              .indexOf("."));
+    else
+    {
+      chainId = " ";
+    }
+
+    String pdbfilename = modelFileNames[frameNo]; // default is first or current
+    // model
+    if (mdlSep > -1)
+    {
+      if (chainSeparator1 == -1)
+      {
+        chainSeparator1 = strInfo.indexOf(".", mdlSep);
+      }
+      String mdlId = (chainSeparator1 > -1) ? strInfo.substring(mdlSep + 1,
+              chainSeparator1) : strInfo.substring(mdlSep + 1);
+      try
+      {
+        // recover PDB filename for the model hovered over.
+        pdbfilename = viewer
+                .getModelFileName(new Integer(mdlId).intValue() - 1);
+      } catch (Exception e)
+      {
+      }
+      ;
+    }
+    if (lastMessage == null || !lastMessage.equals(strInfo))
+      ssm.mouseOverStructure(pdbResNum, chainId, pdbfilename);
+
+    lastMessage = strInfo;
+  }
+
+  public void notifyAtomHovered(int atomIndex, String strInfo, String data)
+  {
+    if (data != null)
+    {
+      System.err.println("Ignoring additional hover info: " + data);
+    }
+    mouseOverStructure(atomIndex, strInfo);
+  }
+
+  /*
+   * { if (history != null && strStatus != null &&
+   * !strStatus.equals("Script completed")) { history.append("\n" + strStatus);
+   * } }
+   */
+
+  public void notifyAtomPicked(int atomIndex, String strInfo, String strData)
+  {
+    /**
+     * this implements the toggle label behaviour copied from the original
+     * structure viewer, MCView
+     */
+    if (strData != null)
+    {
+      System.err.println("Ignoring additional pick data string " + strData);
+    }
+    int chainSeparator = strInfo.indexOf(":");
+    int p = 0;
+    if (chainSeparator == -1)
+      chainSeparator = strInfo.indexOf(".");
+
+    String picked = strInfo.substring(strInfo.indexOf("]") + 1,
+            chainSeparator);
+    String mdlString = "";
+    if ((p = strInfo.indexOf(":")) > -1)
+      picked += strInfo.substring(p + 1, strInfo.indexOf("."));
+
+    if ((p = strInfo.indexOf("/")) > -1)
+    {
+      mdlString += strInfo.substring(p, strInfo.indexOf(" #"));
+    }
+    picked = "((" + picked + ".CA" + mdlString + ")|(" + picked + ".P"
+            + mdlString + "))";
+    jmolHistory(false);
+
+    if (!atomsPicked.contains(picked))
+    {
+      viewer.evalStringQuiet("select " + picked + ";label %n %r:%c");
+      atomsPicked.addElement(picked);
+    }
+    else
+    {
+      viewer.evalString("select " + picked + ";label off");
+      atomsPicked.removeElement(picked);
+    }
+    jmolHistory(true);
+
+  }
+
+  public void notifyCallback(int type, Object[] data)
+  {
+    try
+    {
+      switch (type)
+      {
+      case JmolConstants.CALLBACK_LOADSTRUCT:
+        notifyFileLoaded((String) data[1], (String) data[2],
+                (String) data[3], (String) data[4], ((Integer) data[5])
+                        .intValue());
+
+        break;
+      case JmolConstants.CALLBACK_PICK:
+        notifyAtomPicked(((Integer) data[2]).intValue(), (String) data[1],
+                (String) data[0]);
+        // also highlight in alignment
+      case JmolConstants.CALLBACK_HOVER:
+        notifyAtomHovered(((Integer) data[2]).intValue(), (String) data[1],
+                (String) data[0]);
+        break;
+      case JmolConstants.CALLBACK_SCRIPT:
+        notifyScriptTermination((String) data[2], ((Integer) data[3])
+                .intValue());
+        break;
+      case JmolConstants.CALLBACK_ECHO:
+        sendConsoleEcho((String) data[1]);
+        break;
+      case JmolConstants.CALLBACK_MESSAGE:
+        sendConsoleMessage((data == null) ? ((String) null)
+                : (String) data[1]);
+        break;
+      case JmolConstants.CALLBACK_MEASURE:
+      case JmolConstants.CALLBACK_CLICK:
+      default:
+        System.err.println("Unhandled callback " + type + " " + data);
+        break;
+      }
+    } catch (Exception e)
+    {
+      System.err.println("Squashed Jmol callback handler error:");
+      e.printStackTrace();
+    }
+  }
+
+  public boolean notifyEnabled(int callbackPick)
+  {
+    switch (callbackPick)
+    {
+    case JmolConstants.CALLBACK_ECHO:
+    case JmolConstants.CALLBACK_LOADSTRUCT:
+    case JmolConstants.CALLBACK_MEASURE:
+    case JmolConstants.CALLBACK_MESSAGE:
+    case JmolConstants.CALLBACK_PICK:
+    case JmolConstants.CALLBACK_SCRIPT:
+    case JmolConstants.CALLBACK_HOVER:
+    case JmolConstants.CALLBACK_ERROR:
+      return true;
+    case JmolConstants.CALLBACK_CLICK:
+    case JmolConstants.CALLBACK_ANIMFRAME:
+    case JmolConstants.CALLBACK_MINIMIZATION:
+    case JmolConstants.CALLBACK_RESIZE:
+    case JmolConstants.CALLBACK_SYNC:
+    }
+    return false;
+  }
+
+  public void notifyFileLoaded(String fullPathName, String fileName2,
+          String modelName, String errorMsg, int modelParts)
+  {
+    if (errorMsg != null)
+    {
+      fileLoadingError = errorMsg;
+      updateUI();
+      return;
+    }
+    fileLoadingError = null;
+    modelFileNames = null;
+    chainNames = new Vector();
+    boolean notifyLoaded = false;
+    String[] modelfilenames = getPdbFile();
+    ssm = StructureSelectionManager.getStructureSelectionManager();
+    for (int modelnum = 0; modelnum < modelfilenames.length; modelnum++)
+    {
+      String fileName = modelfilenames[modelnum];
+      if (fileName != null)
+      {
+        // search pdbentries and sequences to find correct pdbentry and
+        // sequence[] pair for this filename
+        if (pdbentry != null)
+        {
+          boolean foundEntry = false;
+          for (int pe = 0; pe < pdbentry.length; pe++)
+          {
+            if (pdbentry[pe].getFile().equals(fileName))
+            {
+              foundEntry = true;
+              MCview.PDBfile pdb;
+              if (loadedInline)
+              {
+                // TODO: replace with getData ?
+                pdb = ssm.setMapping(sequence, chains, pdbentry[pe]
+                        .getFile(), AppletFormatAdapter.PASTE);
+                pdbentry[pe].setFile("INLINE" + pdb.id);
+              }
+              else
+              {
+                // TODO: Jmol can in principle retrieve from CLASSLOADER but
+                // this
+                // needs
+                // to be tested. See mantis bug
+                // https://mantis.lifesci.dundee.ac.uk/view.php?id=36605
+
+                pdb = ssm.setMapping(sequence, chains, pdbentry[pe]
+                        .getFile(), AppletFormatAdapter.URL);
+
+              }
+
+              pdbentry[pe].setId(pdb.id);
+
+              for (int i = 0; i < pdb.chains.size(); i++)
+              {
+                chainNames.addElement(new String(pdb.id + ":"
+                        + ((MCview.PDBChain) pdb.chains.elementAt(i)).id));
+              }
+              notifyLoaded = true;
+            }
+          }
+          if (!foundEntry && associateNewStructs)
+          {
+            // this is a foreign pdb file that jalview doesn't know about - add
+            // it
+            // to the dataset
+            // and try to find a home - either on a matching sequence or as a
+            // new
+            // sequence.
+            String pdbcontent = viewer.getData("/" + (modelnum + 1) + ".1",
+                    "PDB");
+            // parse pdb file into a chain, etc.
+            // locate best match for pdb in associated views and add mapping to
+            // ssm
+            // if properly registered then notifyLoaded=true;
+          }
+        }
+      }
+    }
+    // FILE LOADED OK
+    // so finally, update the jmol bits and pieces
+    jmolpopup.updateComputedMenus();
+    viewer
+            .evalStringQuiet("model 0; select backbone;restrict;cartoon;wireframe off;spacefill off");
+    // register ourselves as a listener and notify the gui that it needs to
+    // update itself.
+    ssm.addStructureViewerListener(this);
+    if (notifyLoaded)
+    {
+      updateUI();
+    }
+
+  }
+
+  public void notifyNewPickingModeMeasurement(int iatom, String strMeasure)
+  {
+    notifyAtomPicked(iatom, strMeasure, null);
+  }
+
+  public void notifyScriptTermination(String strStatus, int msWalltime)
+  {
+  }
+
+  /**
+   * display a message echoed from the jmol viewer
+   * 
+   * @param strEcho
+   */
+  public abstract void sendConsoleEcho(String strEcho); /*
+                                                         * { showConsole(true);
+                                                         * 
+                                                         * history.append("\n" +
+                                                         * strEcho); }
+                                                         */
+
+  // /End JmolStatusListener
+  // /////////////////////////////
+
+  /**
+   * @param strStatus
+   *          status message - usually the response received after a script
+   *          executed
+   */
+  public abstract void sendConsoleMessage(String strStatus);
+
+  public void setCallbackFunction(String callbackType,
+          String callbackFunction)
+  {
+    System.err.println("Ignoring set-callback request to associate "
+            + callbackType + " with function " + callbackFunction);
+
+  }
+
+  public void setJalviewColourScheme(ColourSchemeI cs)
+  {
+    colourBySequence = false;
+
+    if (cs == null)
+      return;
+
+    String res;
+    int index;
+    Color col;
+    jmolHistory(false);
+
+    Enumeration en = ResidueProperties.aa3Hash.keys();
+    StringBuffer command = new StringBuffer("select *;color white;");
+    while (en.hasMoreElements())
+    {
+      res = en.nextElement().toString();
+      index = ((Integer) ResidueProperties.aa3Hash.get(res)).intValue();
+      if (index > 20)
+        continue;
+
+      col = cs.findColour(ResidueProperties.aa[index].charAt(0));
+
+      command.append("select " + res + ";color[" + col.getRed() + ","
+              + col.getGreen() + "," + col.getBlue() + "];");
+    }
+
+    viewer.evalStringQuiet(command.toString());
+    jmolHistory(true);
+  }
+
+  public void showHelp()
+  {
+    showUrl("http://jmol.sourceforge.net/docs/JmolUserGuide/", "jmolHelp");
+  }
+
+  /**
+   * open the URL somehow
+   * 
+   * @param target
+   */
+  public abstract void showUrl(String url, String target);
+
+  /**
+   * called when the binding thinks the UI needs to be refreshed after a Jmol
+   * state change. this could be because structures were loaded, or because an
+   * error has occured.
+   */
+  abstract void updateUI();
+
+}