public class CommitActionFactory extends DefaultCommitActionFactory {

	@Override
	public ICommitDialog getCommitDialog(final Shell shell, Collection allFilesToCommit,
			final ICommentDialogPanel commentPanel) {
		return new ICommitDialog() {
			public String getMessage() {
				return commentPanel.getMessage();
			}

			public int open() {
				boolean isCommitValid = performSomeValidation();
				if (!isCommitValid) {
					return DefaultDialog.DIALOG_FAILED;
				}

				return new DefaultDialog(shell, commentPanel).open();
			}
		};
	}
}