package ca.uhn.hl7v2.testpanel.ui.editor;
   
   import java.beans.PropertyChangeEvent;
   import java.beans.PropertyChangeListener;
   
   import javax.swing.DefaultComboBoxModel;
   
   import ca.uhn.hl7v2.testpanel.controller.Controller;
   import ca.uhn.hl7v2.testpanel.model.conf.TableFile;
  import ca.uhn.hl7v2.testpanel.model.conf.TableFileList;
  import ca.uhn.hl7v2.testpanel.ui.IDestroyable;
  
  public class TablesComboModel extends DefaultComboBoxModel implements IDestroyable {
  
  	public static final String NONE_DEFINED = "None Defined";
  	public static final String NONE = "None";
  
  	private static PropertyChangeListener myFilesListener;
  	private static TableFileList myTableFileList;
  
  	/**
  	 * Constructor
  	 */
  	public TablesComboModel(Controller theController) {
  
  		myTableFileList = theController.getTableFileList();
  		myFilesListener = new PropertyChangeListener() {
  			public void propertyChange(PropertyChangeEvent theEvt) {
  				update();
  			}
  		};
  		myTableFileList.addPropertyChangeListener(TableFileList.PROP_FILES, myFilesListener);
  		update();
  	}
  
  	private void update() {
  		int i = 0;
  
  		if (myTableFileList.getTableFiles().size() > 0) {
  			if (getSize() == 0) {
  				addElement(NONE);
  			} else if (getElementAt(0) != NONE) {
  				insertElementAt(NONE, 0);
  			}
  		}
  
  		for (TableFile next : myTableFileList.getTableFiles()) {
  			String nextName = next.getName();
  			if (getSize() <= (i + 1) || !getElementAt(i).equals(nextName)) {
  				insertElementAt(nextName, i + 1);
  			}
  
  			i++;
  		}
  
  		if (this.getSize() == 0) {
  			addElement(NONE_DEFINED);
  		}
  
  		while (Math.min(1, this.getSize()) > myTableFileList.getTableFiles().size()) {
  			removeElementAt(this.getSize() - 1);
  		}
  	}
  
  	public void destroy() {
  		myTableFileList.removePropertyChangeListener(TableFileList.PROP_FILES, myFilesListener);
  	}
  
  }