com.sun.source.util.TreePathScanner Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jdk.compiler Show documentation
Show all versions of jdk.compiler Show documentation
Maven repackaging of OpenJDK's jdk.compiler module
The newest version!
/*
* Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.source.util;
import com.sun.source.tree.*;
/**
* A TreeVisitor that visits all the child tree nodes, and provides
* support for maintaining a path for the parent nodes.
* To visit nodes of a particular type, just override the
* corresponding visitorXYZ method.
* Inside your method, call super.visitXYZ to visit descendant
* nodes.
*
* @author Jonathan Gibbons
* @since 1.6
*/
@jdk.Exported
public class TreePathScanner extends TreeScanner {
/**
* Scan a tree from a position identified by a TreePath.
*/
public R scan(TreePath path, P p) {
this.path = path;
try {
return path.getLeaf().accept(this, p);
} finally {
this.path = null;
}
}
/**
* Scan a single node.
* The current path is updated for the duration of the scan.
*/
@Override
public R scan(Tree tree, P p) {
if (tree == null)
return null;
TreePath prev = path;
path = new TreePath(path, tree);
try {
return tree.accept(this, p);
} finally {
path = prev;
}
}
/**
* Get the current path for the node, as built up by the currently
* active set of scan calls.
*/
public TreePath getCurrentPath() {
return path;
}
private TreePath path;
}