827N/A/*
2362N/A * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
827N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
827N/A *
827N/A * This code is free software; you can redistribute it and/or modify it
827N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
827N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
827N/A *
827N/A * This code is distributed in the hope that it will be useful, but WITHOUT
827N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
827N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
827N/A * version 2 for more details (a copy is included in the LICENSE file that
827N/A * accompanied this code).
827N/A *
827N/A * You should have received a copy of the GNU General Public License version
827N/A * 2 along with this work; if not, write to the Free Software Foundation,
827N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
827N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
827N/A */
827N/Apackage com.sun.beans.decoder;
827N/A
827N/A/**
827N/A * This class is intended to handle <null> element.
827N/A * This element specifies {@code null} value.
827N/A * It should not contain body or inner elements.
827N/A * For example:<pre>
827N/A * &lt;null/&gt;</pre>
827N/A * is equivalent to {@code null} in Java code.
827N/A * <p>The following atribute is supported:
827N/A * <dl>
827N/A * <dt>id
827N/A * <dd>the identifier of the variable that is intended to store the result
827N/A * </dl>
827N/A *
827N/A * @since 1.7
827N/A *
827N/A * @author Sergey A. Malenkov
827N/A */
827N/Aclass NullElementHandler extends ElementHandler implements ValueObject {
827N/A
827N/A /**
827N/A * Returns the value of this element.
827N/A *
827N/A * @return the value of this element
827N/A */
827N/A @Override
827N/A protected final ValueObject getValueObject() {
827N/A return this;
827N/A }
827N/A
827N/A /**
827N/A * Returns {@code null}
827N/A * as a value of &lt;null&gt; element.
827N/A * This method should be overridden in those handlers
827N/A * that extend behavior of this element.
827N/A *
827N/A * @return {@code null} by default
827N/A */
827N/A public Object getValue() {
827N/A return null;
827N/A }
827N/A
827N/A /**
827N/A * Returns {@code void} state of this value object.
827N/A *
827N/A * @return {@code false} always
827N/A */
827N/A public final boolean isVoid() {
827N/A return false;
827N/A }
827N/A}