Bug 83369 [Import/Export] Unused manifest file generation code in ZipFileExporter
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/ArchiveFileExportOperation.java
/**
     * Add a new entry to the error table with the passed information
     */
    protected void addError(String message, Throwable e) {
        errorTable.add(new Status(IStatus.ERROR,
                IDEWorkbenchPlugin.IDE_WORKBENCH, 0, message, e));
    }
    /**
     *  Answer the total number of file resources that exist at or below self
     *  in the resources hierarchy.
     *
     *  @return int
     *  @param checkResource org.eclipse.core.resources.IResource
     */
    protected int countChildrenOf(IResource checkResource) throws CoreException {
        if (checkResource.getType() == IResource.FILE)
            return 1;
        int count = 0;
        if (checkResource.isAccessible()) {
            IResource[] children = ((IContainer) checkResource).members();
            for (int i = 0; i < children.length; i++)
                count += countChildrenOf(children[i]);
        }
        return count;
    }
    /**
     *	Answer a boolean indicating the number of file resources that were
     *	specified for export
     *
     *	@return int