1/*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CachedResourceHandle.h"
28
29#include "CachedResource.h"
30
31namespace WebCore {
32
33CachedResourceHandleBase::CachedResourceHandleBase()
34    : m_resource(0)
35{
36}
37
38CachedResourceHandleBase::CachedResourceHandleBase(CachedResource* resource)
39    : m_resource(resource)
40{
41    if (m_resource)
42        m_resource->registerHandle(this);
43}
44
45CachedResourceHandleBase::CachedResourceHandleBase(const CachedResourceHandleBase& other)
46    : m_resource(other.m_resource)
47{
48    if (m_resource)
49        m_resource->registerHandle(this);
50}
51
52CachedResourceHandleBase::~CachedResourceHandleBase()
53{
54    if (m_resource)
55        m_resource->unregisterHandle(this);
56}
57
58void CachedResourceHandleBase::setResource(CachedResource* resource)
59{
60    if (resource == m_resource)
61        return;
62    if (m_resource)
63        m_resource->unregisterHandle(this);
64    m_resource = resource;
65    if (m_resource)
66        m_resource->registerHandle(this);
67}
68
69}
70