1 /* 2 * Copyright (c) 1997, 2012, 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 26 package com.sun.xml.internal.bind.v2.runtime.reflect; 27 28 import com.sun.xml.internal.bind.api.AccessorException; 29 30 /** 31 * {@link Accessor} wrapper that replaces a null with an empty collection. 32 * 33 * <p> 34 * This is so that JAX-WS property accessor will work like an ordinary getter. 35 * 36 * 37 * @author Kohsuke Kawaguchi 38 */ 39 public class NullSafeAccessor<B,V,P> extends Accessor<B,V> { 40 private final Accessor<B,V> core; 41 private final Lister<B,V,?,P> lister; 42 43 public NullSafeAccessor(Accessor<B,V> core, Lister<B,V,?,P> lister) { 44 super(core.getValueType()); 45 this.core = core; 46 this.lister = lister; 47 } 48 49 public V get(B bean) throws AccessorException { 50 V v = core.get(bean); 51 if(v==null) { 52 // creates a new object 53 P pack = lister.startPacking(bean,core); 54 lister.endPacking(pack,bean,core); 55 v = core.get(bean); 56 } 57 return v; 58 } 59 60 public void set(B bean, V value) throws AccessorException { 61 core.set(bean,value); 62 } 63 }