850N/A * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved. 574N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 574N/A * This code is free software; you can redistribute it and/or modify it 574N/A * under the terms of the GNU General Public License version 2 only, as 574N/A * published by the Free Software Foundation. Oracle designates this 574N/A * particular file as subject to the "Classpath" exception as provided 574N/A * by Oracle in the LICENSE file that accompanied this code. 574N/A * This code is distributed in the hope that it will be useful, but WITHOUT 574N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 574N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 574N/A * version 2 for more details (a copy is included in the LICENSE file that 574N/A * accompanied this code). 574N/A * You should have received a copy of the GNU General Public License version 574N/A * 2 along with this work; if not, write to the Free Software Foundation, 574N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 574N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 574N/A * or visit www.oracle.com if you need additional information or have any 574N/A * A scanning visitor of program elements with default behavior 574N/A * appropriate for the {@link SourceVersion#RELEASE_7 RELEASE_7} 574N/A * source version. The <tt>visit<i>XYZ</i></tt> methods in this 574N/A * class scan their component elements by calling {@code scan} on 574N/A * their {@linkplain Element#getEnclosedElements enclosed elements}, 574N/A * {@linkplain ExecutableElement#getParameters parameters}, etc., as 574N/A * indicated in the individual method specifications. A subclass can 574N/A * control the order elements are visited by overriding the 574N/A * <tt>visit<i>XYZ</i></tt> methods. Note that clients of a scanner 574N/A * may get the desired behavior be invoking {@code v.scan(e, p)} rather 574N/A * than {@code v.visit(e, p)} on the root objects of interest. 574N/A * <p>When a subclass overrides a <tt>visit<i>XYZ</i></tt> method, the 574N/A * new method can cause the enclosed elements to be scanned in the 574N/A * default way by calling <tt>super.visit<i>XYZ</i></tt>. In this 574N/A * fashion, the concrete visitor can control the ordering of traversal 574N/A * over the component elements with respect to the additional 574N/A * processing; for example, consistently calling 574N/A * <tt>super.visit<i>XYZ</i></tt> at the start of the overridden 574N/A * methods will yield a preorder traversal, etc. If the component 574N/A * elements should be traversed in some other order, instead of 574N/A * calling <tt>super.visit<i>XYZ</i></tt>, an overriding visit method 574N/A * should call {@code scan} with the elements in the desired order. 574N/A * <p> Methods in this class may be overridden subject to their 574N/A * general contract. Note that annotating methods in concrete 574N/A * subclasses with {@link java.lang.Override @Override} will help 574N/A * ensure that methods are overridden as intended. 574N/A * <p> <b>WARNING:</b> The {@code ElementVisitor} interface 574N/A * implemented by this class may have methods added to it in the 574N/A * future to accommodate new, currently unknown, language structures 574N/A * added to future versions of the Java™ programming language. 574N/A * Therefore, methods whose names begin with {@code "visit"} may be 574N/A * added to this class in the future; to avoid incompatibilities, 574N/A * classes which extend this class should not declare any instance 574N/A * methods with names beginning with {@code "visit"}. 574N/A * <p>When such a new visit method is added, the default 574N/A * implementation in this class will be to call the {@link 574N/A * #visitUnknown visitUnknown} method. A new element scanner visitor 574N/A * class will also be introduced to correspond to the new language 574N/A * level; this visitor will have different default behavior for the 574N/A * visit method in question. When the new visitor is introduced, all 574N/A * or portions of this visitor may be deprecated. 574N/A * @param <R> the return type of this visitor's methods. Use {@link 574N/A * Void} for visitors that do not need to return results. 574N/A * @param <P> the type of the additional parameter to this visitor's 574N/A * methods. Use {@code Void} for visitors that do not need an 574N/A * additional parameter. 574N/A * Constructor for concrete subclasses; uses {@code null} for the 574N/A * Constructor for concrete subclasses; uses the argument for the 850N/A * This implementation scans the enclosed elements. 850N/A * @param e {@inheritDoc} 850N/A * @param p {@inheritDoc} 850N/A * @return the result of scanning