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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 utility class provides {@code static} method | ||
| 29 | * to create the object that contains the result of method execution. | ||
| 30 | * | ||
| 31 | * @since 1.7 | ||
| 32 | * | ||
| 33 | * @author Sergey A. Malenkov | ||
| 34 | */ | ||
| 35 | final class ValueObjectImpl implements ValueObject { | ||
| 36 | static final ValueObject NULL = new ValueObjectImpl(null); | ||
| 37 | static final ValueObject VOID = new ValueObjectImpl(); | ||
| 38 | |||
| 39 | /** | ||
| 40 | * Returns the object that describes returning value. | ||
| 41 | * | ||
| 42 | * @param value the result of method execution | ||
| 43 | * @return the object that describes value | ||
| 44 | */ | ||
| 45 | static ValueObject create(Object value) { | ||
| 46 | return (value != null) | ||
| 47 | ? new ValueObjectImpl(value) | ||
| 48 | : NULL; | ||
| 49 | } | ||
| 50 | |||
| 51 | private Object value; | ||
| 52 | private boolean isVoid; | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Creates the object that describes returning void value. | ||
| 56 | */ | ||
| 57 | private ValueObjectImpl() { | ||
| 58 | this.isVoid = true; | ||
| 59 | } | ||
| 60 | |||
| 61 | /** | ||
| 62 | * Creates the object that describes returning non-void value. | ||
| 63 | * | ||
| 64 | * @param value the result of method execution | ||
| 65 | */ | ||
| 66 | private ValueObjectImpl(Object value) { | ||
| 67 | this.value = value; | ||
| 68 | } | ||
| 69 | |||
| 70 | /** | ||
| 71 | * Returns the result of method execution. | ||
| 72 | * | ||
| 73 | * @return the result of method execution | ||
| 74 | */ | ||
| 75 | public Object getValue() { | ||
| 76 | return this.value; | ||
| 77 | } | ||
| 78 | |||
| 79 | /** | ||
| 80 | * Returns {@code void} state of this value object. | ||
| 81 | * | ||
| 82 | * @return {@code true} if value should be ignored, | ||
| 83 | * {@code false} otherwise | ||
| 84 | */ | ||
| 85 | public boolean isVoid() { | ||
| 86 | return this.isVoid; | ||
| 87 | } | ||
| 88 | } | ||