Mercurial > jdk8-mips64-public > langtools / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/share/classes/com/sun/source/util/TreePathScanner.java	Wed Apr 27 01:34:52 2016 +0800
     1.3 @@ -0,0 +1,83 @@
     1.4 +/*
     1.5 + * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
     1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.7 + *
     1.8 + * This code is free software; you can redistribute it and/or modify it
     1.9 + * under the terms of the GNU General Public License version 2 only, as
    1.10 + * published by the Free Software Foundation.  Oracle designates this
    1.11 + * particular file as subject to the "Classpath" exception as provided
    1.12 + * by Oracle in the LICENSE file that accompanied this code.
    1.13 + *
    1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
    1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    1.16 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    1.17 + * version 2 for more details (a copy is included in the LICENSE file that
    1.18 + * accompanied this code).
    1.19 + *
    1.20 + * You should have received a copy of the GNU General Public License version
    1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
    1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    1.23 + *
    1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    1.25 + * or visit www.oracle.com if you need additional information or have any
    1.26 + * questions.
    1.27 + */
    1.28 +
    1.29 +package com.sun.source.util;
    1.30 +
    1.31 +import com.sun.source.tree.*;
    1.32 +
    1.33 +/**
    1.34 + * A TreeVisitor that visits all the child tree nodes, and provides
    1.35 + * support for maintaining a path for the parent nodes.
    1.36 + * To visit nodes of a particular type, just override the
    1.37 + * corresponding visitorXYZ method.
    1.38 + * Inside your method, call super.visitXYZ to visit descendant
    1.39 + * nodes.
    1.40 + *
    1.41 + * @author Jonathan Gibbons
    1.42 + * @since 1.6
    1.43 + */
    1.44 +@jdk.Exported
    1.45 +public class TreePathScanner<R, P> extends TreeScanner<R, P> {
    1.46 +
    1.47 +    /**
    1.48 +     * Scan a tree from a position identified by a TreePath.
    1.49 +     */
    1.50 +    public R scan(TreePath path, P p) {
    1.51 +        this.path = path;
    1.52 +        try {
    1.53 +            return path.getLeaf().accept(this, p);
    1.54 +        } finally {
    1.55 +            this.path = null;
    1.56 +        }
    1.57 +    }
    1.58 +
    1.59 +    /**
    1.60 +     * Scan a single node.
    1.61 +     * The current path is updated for the duration of the scan.
    1.62 +     */
    1.63 +    @Override
    1.64 +    public R scan(Tree tree, P p) {
    1.65 +        if (tree == null)
    1.66 +            return null;
    1.67 +
    1.68 +        TreePath prev = path;
    1.69 +        path = new TreePath(path, tree);
    1.70 +        try {
    1.71 +            return tree.accept(this, p);
    1.72 +        } finally {
    1.73 +            path = prev;
    1.74 +        }
    1.75 +    }
    1.76 +
    1.77 +    /**
    1.78 +     * Get the current path for the node, as built up by the currently
    1.79 +     * active set of scan calls.
    1.80 +     */
    1.81 +    public TreePath getCurrentPath() {
    1.82 +        return path;
    1.83 +    }
    1.84 +
    1.85 +    private TreePath path;
    1.86 +}