ActivitiDiagramMatchingStrategy.java

package org.activiti.designer.eclipse.editor;

import org.activiti.designer.eclipse.util.FileService;
import org.eclipse.core.resources.IFile;
import org.eclipse.graphiti.ui.editor.DiagramEditorMatchingStrategy;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorMatchingStrategy;
import org.eclipse.ui.IEditorReference;
import org.eclipse.ui.PartInitException;

public class ActivitiDiagramMatchingStrategy implements IEditorMatchingStrategy {

	@Override
  public boolean matches(final IEditorReference editorRef, final IEditorInput input) {

	  try {
  	  final IFile newDataFile = FileService.getDataFileForInput(input);
  	  final IFile openEditorDataFile = FileService.getDataFileForInput(editorRef.getEditorInput());

  	  if (newDataFile.equals(openEditorDataFile)) {
  	    return true;
  	  }
	  } catch (PartInitException exception) {
      exception.printStackTrace();
    }

	  return new DiagramEditorMatchingStrategy().matches(editorRef, input);
	}
}