0N/A/*
553N/A * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
553N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
553N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
553N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
553N/A * or visit www.oracle.com if you need additional information or have any
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0N/A */
0N/A
0N/Apackage com.sun.source.util;
0N/A
0N/Aimport com.sun.source.tree.*;
0N/A
0N/A/**
0N/A * A TreeVisitor that visits all the child tree nodes, and provides
0N/A * support for maintaining a path for the parent nodes.
0N/A * To visit nodes of a particular type, just override the
0N/A * corresponding visitorXYZ method.
0N/A * Inside your method, call super.visitXYZ to visit descendant
0N/A * nodes.
0N/A *
0N/A * @author Jonathan Gibbons
0N/A * @since 1.6
0N/A */
0N/Apublic class TreePathScanner<R, P> extends TreeScanner<R, P> {
0N/A
0N/A /**
0N/A * Scan a tree from a position identified by a TreePath.
0N/A */
0N/A public R scan(TreePath path, P p) {
0N/A this.path = path;
0N/A try {
0N/A return path.getLeaf().accept(this, p);
0N/A } finally {
0N/A this.path = null;
0N/A }
0N/A }
0N/A
0N/A /**
0N/A * Scan a single node.
0N/A * The current path is updated for the duration of the scan.
0N/A */
0N/A @Override
0N/A public R scan(Tree tree, P p) {
0N/A if (tree == null)
0N/A return null;
0N/A
0N/A TreePath prev = path;
0N/A path = new TreePath(path, tree);
0N/A try {
0N/A return tree.accept(this, p);
0N/A } finally {
0N/A path = prev;
0N/A }
0N/A }
0N/A
0N/A /**
0N/A * Get the current path for the node, as built up by the currently
0N/A * active set of scan calls.
0N/A */
0N/A public TreePath getCurrentPath() {
0N/A return path;
0N/A }
0N/A
0N/A private TreePath path;
0N/A}