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 */ 25package 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 */ 35final 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} 89