Bug 291755 [Filters] Filters implementation and API cleanup
This bug is raised to track reviewing and cleanup of filters API and implementation.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceFilterGroup.java
static String EMPTY = ""; 
	String arguments = EMPTY;
	String id = null;
	IPath path = null;
	IProject project = null;
	int type = 0;
	FilterCopy parent = null;
	LinkedList children = null;
	IResourceFilter original = null;
	int serialNumber = ++lastSerialNumber;
	static private int lastSerialNumber = 0;
	public FilterCopy(IResourceFilter filter) {
		internalCopy(filter);
		original = filter;
	}
	public void setParent(FilterCopy parent) {
		this.parent = parent;
	}
	public boolean canAcceptDrop() {
		int limit = getChildrenLimit();
		if (limit > 0) {
			FilterCopy[] tmp = getChildren();
			return (tmp == null) || (tmp.length < limit);