Here you can find the source of pathTo(String ref)
public static String pathTo(String ref)
//package com.java2s; /*//from w ww .jav a 2s.com * * Artistic License * * Preamble * * The intent of this document is to state the conditions under which a Package may be copied, such that * the Copyright Holder maintains some semblance of artistic control over the development of the * package, while giving the users of the package the right to use and distribute the Package in a * more-or-less customary fashion, plus the right to make reasonable modifications. * * Definitions: * * "Package" refers to the collection of files distributed by the Copyright Holder, and derivatives * of that collection of files created through textual modification. * * "Standard Version" refers to such a Package if it has not been modified, or has been modified * in accordance with the wishes of the Copyright Holder. * * "Copyright Holder" is whoever is named in the copyright or copyrights for the package. * * "You" is you, if you're thinking about copying or distributing this Package. * * "Reasonable copying fee" is whatever you can justify on the basis of media cost, duplication * charges, time of people involved, and so on. 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THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */ public class Main { /** * returns the path to a instance node (i.e. the part of a binding * expression before the last element ('/')). If no path exists * (because the binding expression contains only one step or begins * with a '/') the returnvalue is null */ public static String pathTo(String ref) { if (ref != null) { int pos = ref.lastIndexOf("/"); if ((pos == -1) || (pos == 0)) { return null; } return ref.substring(0, pos); } return null; } }