FileTreeWalker.java revision 907
893N/A * Copyright 2007-2009 Sun Microsystems, Inc. All Rights Reserved. 893N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 893N/A * This code is free software; you can redistribute it and/or modify it 893N/A * under the terms of the GNU General Public License version 2 only, as 893N/A * published by the Free Software Foundation. Sun designates this 893N/A * particular file as subject to the "Classpath" exception as provided 893N/A * by Sun in the LICENSE file that accompanied this code. 893N/A * This code is distributed in the hope that it will be useful, but WITHOUT 893N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 893N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 893N/A * version 2 for more details (a copy is included in the LICENSE file that 893N/A * accompanied this code). 893N/A * You should have received a copy of the GNU General Public License version 893N/A * 2 along with this work; if not, write to the Free Software Foundation, 893N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 893N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 893N/A * CA 95054 USA or visit www.sun.com if you need additional information or 893N/A * Simple file tree walker that works in a similar manner to nftw(3C). 893N/A * @see Files#walkFileTree 893N/A * Walk file tree starting at the given file 907N/A // don't use attributes of starting file as they may be stale 907N/A * the directory to visit 893N/A * use when cycle detection is enabled 907N/A // if attributes are cached then use them if possible 893N/A // attempt to get attributes of file. If fails and we are following 893N/A // links then a link target might not exist so get attributes of link 893N/A // unable to get attributes of file 893N/A // file is not a directory so invoke visitFile method 893N/A // if this directory and ancestor has a file key then we compare 893N/A // them; otherwise we use less efficient isSameFile test. 893N/A // the exception notified to the postVisitDirectory method 893N/A // invoke preVisitDirectory and then visit each entry 893N/A // if an I/O occurs during iteration then a CME is thrown. We 893N/A // need to distinguish this from a CME thrown by the visitor. 893N/A // returning null will cause NPE to be thrown 893N/A // skip remaining siblings in this directory 893N/A // if CME thrown because the iteration failed then remember 893N/A // the IOException so that it is notified to postVisitDirectory 893N/A // invoke postVisitDirectory last 893N/A // remove key from trail if doing cycle detection