01: /*
02: * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any 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,
44: Lister<B, V, ?, P> lister) {
45: super (core.getValueType());
46: this .core = core;
47: this .lister = lister;
48: }
49:
50: public V get(B bean) throws AccessorException {
51: V v = core.get(bean);
52: if (v == null) {
53: // creates a new object
54: P pack = lister.startPacking(bean, core);
55: lister.endPacking(pack, bean, core);
56: v = core.get(bean);
57: }
58: return v;
59: }
60:
61: public void set(B bean, V value) throws AccessorException {
62: core.set(bean, value);
63: }
64: }
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