SdsFileDeleteParticipant.java example

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gda-dal-master
package org.csstudio.sds.ui.internal.refactoringparticipants;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.ltk.core.refactoring.participants.CheckConditionsContext;
import org.eclipse.ltk.core.refactoring.participants.DeleteParticipant;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;

public class SdsFileDeleteParticipant extends DeleteParticipant {

	private IFile _deletedFile;

	public SdsFileDeleteParticipant() {
	}

	@Override
	protected boolean initialize(Object element) {
		if (element instanceof IFile) {
			IFile file = (IFile) element;
			if (file.getFileExtension().equalsIgnoreCase("css-sds")) {
				_deletedFile = file;
				return true;
			}
		}
		return false;
	}

	@Override
	public String getName() {
		return "SDS File Delete Participant";
	}

	@Override
	public RefactoringStatus checkConditions(IProgressMonitor pm,
			CheckConditionsContext context) throws OperationCanceledException {
		RefactoringStatus status = new RefactoringStatus();
		IWorkbenchPage activePage = findActiveWorkbenchPage();
		final IEditorPart editor = findOpenEditor(activePage, _deletedFile);
		if (editor != null) {
			closeOpenEditor(activePage, editor);
		}
		return status;
	}

	private void closeOpenEditor(final IWorkbenchPage activePage, final IEditorPart editor) {
		Display.getDefault().asyncExec(new Runnable() {
			@Override
			public void run() {
				activePage.closeEditor(editor, false);
			}
		});
	}

	private IEditorPart findOpenEditor(IWorkbenchPage activePage, IFile openFile) {
		IEditorPart editor = activePage
				.findEditor(new FileEditorInput(openFile));
		if (editor != null) {
			return editor;
		}
		return null;
	}

	private IWorkbenchPage findActiveWorkbenchPage() {
		IWorkbenchWindow[] workbenchWindows = PlatformUI.getWorkbench()
				.getWorkbenchWindows();
		for (IWorkbenchWindow window : workbenchWindows) {
			if (window.getActivePage() != null) {
				return window.getActivePage();
			}
		}
		return null;
	}

	@Override
	public Change createChange(IProgressMonitor pm) throws CoreException,
			OperationCanceledException {
		return null;
	}

}