How to get path of current selected file in Eclipse plugin development - eclipse-plugin

Question

I am opening an Editor with Open with menu in Eclipse.But i am not able to get path of current selected file.Sometimes it gives proper path but sometimes throws null pointer Exception.
I am writing following code to get selected file path.
IWorkbenchPage iwPage=PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
System.err.println("iwpage::"+iwPage);
ISelection selection=iwPage.getSelection();
System.err.println("selection::::testtttt"+selection.toString());
if(selection!=null && selection instanceof IStructuredSelection)
{
IStructuredSelection selectedFileSelection = (IStructuredSelection) selection;
System.out.println(selection.toString());
Object obj = selectedFileSelection.getFirstElement();
selectedFile=(IResource)obj;
System.err.println("selection::::"+selectedFile.getLocation().toString());
String html=selectedFile.getLocation().toString().replace(" ","%20");
String html_file="file:///"+html;
return html_file;
}

Answer 1

I found an answer in the Eclipse forum that seems easier and works for me so far.
IWorkbench workbench = PlatformUI.getWorkbench();
IWorkbenchWindow window =
workbench == null ? null : workbench.getActiveWorkbenchWindow();
IWorkbenchPage activePage =
window == null ? null : window.getActivePage();
IEditorPart editor =
activePage == null ? null : activePage.getActiveEditor();
IEditorInput input =
editor == null ? null : editor.getEditorInput();
IPath path = input instanceof FileEditorInput
? ((FileEditorInput)input).getPath()
: null;
if (path != null)
{
// Do something with path.
}
Some of those classes required new project references, so here's a list of all my imports for that class. Not all of them are related to this snippet, of course.
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.source.CompositeRuler;
import org.eclipse.jface.text.source.LineNumberRulerColumn;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;
import org.osgi.framework.Bundle;

Answer 2

You can ask the active editor for the path of the underlying file. Just register an IPartListener to your active IWorkbenchPage and ask withing this listener when activating a part. Here is a snippet
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage()
.addPartListener(new IPartListener() {
#Override
public void partOpened(IWorkbenchPart part) {
// TODO Auto-generated method stub
}
#Override
public void partDeactivated(IWorkbenchPart part) {
// TODO Auto-generated method stub
}
#Override
public void partClosed(IWorkbenchPart part) {
// TODO Auto-generated method stub
}
#Override
public void partBroughtToTop(IWorkbenchPart part) {
if (part instanceof IEditorPart) {
if (((IEditorPart) part).getEditorInput() instanceof IFileEditorInput) {
IFile file = ((IFileEditorInput) ((EditorPart) part)
.getEditorInput()).getFile();
System.out.println(file.getLocation());
}
}
}
#Override
public void partActivated(IWorkbenchPart part) {
// TODO Auto-generated method stub
}
});