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| 1 | /* | ||
| 2 | * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package com.sun.beans.decoder; | ||
| 26 | |||
| 27 | /** | ||
| 28 | * This class is intended to handle <null> element. | ||
| 29 | * This element specifies {@code null} value. | ||
| 30 | * It should not contain body or inner elements. | ||
| 31 | * For example:<pre> | ||
| 32 | * <null/></pre> | ||
| 33 | * is equivalent to {@code null} in Java code. | ||
| 34 | * <p>The following atribute is supported: | ||
| 35 | * <dl> | ||
| 36 | * <dt>id | ||
| 37 | * <dd>the identifier of the variable that is intended to store the result | ||
| 38 | * </dl> | ||
| 39 | * | ||
| 40 | * @since 1.7 | ||
| 41 | * | ||
| 42 | * @author Sergey A. Malenkov | ||
| 43 | */ | ||
| 44 | class NullElementHandler extends ElementHandler implements ValueObject { | ||
| 45 | |||
| 46 | /** | ||
| 47 | * Returns the value of this element. | ||
| 48 | * | ||
| 49 | * @return the value of this element | ||
| 50 | */ | ||
| 51 | @Override | ||
| 52 | protected final ValueObject getValueObject() { | ||
| 53 | return this; | ||
| 54 | } | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Returns {@code null} | ||
| 58 | * as a value of <null> element. | ||
| 59 | * This method should be overridden in those handlers | ||
| 60 | * that extend behavior of this element. | ||
| 61 | * | ||
| 62 | * @return {@code null} by default | ||
| 63 | */ | ||
| 64 | public Object getValue() { | ||
| 65 | return null; | ||
| 66 | } | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Returns {@code void} state of this value object. | ||
| 70 | * | ||
| 71 | * @return {@code false} always | ||
| 72 | */ | ||
| 73 | public final boolean isVoid() { | ||
| 74 | return false; | ||
| 75 | } | ||
| 76 | } | ||