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reference_list.cpp
1 /*
2  * This file is part of the KDE libraries
3  * Copyright (C) 2003 Apple Computer, Inc
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public License
16  * along with this library; see the file COPYING.LIB. If not, write to
17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  *
20  */
21 
22 #include "reference_list.h"
23 
24 namespace KJS {
25  class ReferenceListNode {
26  friend class ReferenceList;
27  friend class ReferenceListIterator;
28 
29  protected:
30  ReferenceListNode(const Reference &ref) : reference(ref), next(NULL) {}
31 
32  private:
33  Reference reference;
34  ReferenceListNode *next;
35  };
36 
37  class ReferenceListHeadNode : private ReferenceListNode {
38  friend class ReferenceList;
39  friend class ReferenceListIterator;
40 
41  ReferenceListHeadNode(const Reference &ref) : ReferenceListNode(ref), refcount(1), length(0) {}
42  int refcount;
43  int length;
44  };
45 
46 }
47 
48 using namespace KJS;
49 
50 // ReferenceList
51 
52 ReferenceList::ReferenceList() :
53  head(NULL),
54  tail(NULL)
55 {
56 }
57 
58 ReferenceList::ReferenceList(const ReferenceList &list)
59 {
60  head = list.head;
61  tail = list.tail;
62  if (head != NULL) {
63  head->refcount++;
64  }
65 }
66 
67 ReferenceList &ReferenceList::operator=(const ReferenceList &list)
68 {
69  ReferenceList tmp(list);
70  tmp.swap(*this);
71 
72  return *this;
73 }
74 
75 void ReferenceList::swap(ReferenceList &list)
76 {
77  ReferenceListHeadNode *tmpHead = list.head;
78  list.head = head;
79  head = tmpHead;
80 
81  ReferenceListNode *tmpTail = list.tail;
82  list.tail = tail;
83  tail = tmpTail;
84 }
85 
86 
87 void ReferenceList::append(const Reference& ref)
88 {
89  if (tail == NULL) {
90  tail = head = new ReferenceListHeadNode(ref);
91  } else {
92  tail->next = new ReferenceListNode(ref);
93  tail = tail->next;
94  }
95  head->length++;
96 }
97 
98 int ReferenceList::length()
99 {
100  return head ? head->length : 0;
101 }
102 
103 ReferenceList::~ReferenceList()
104 {
105  if (head != NULL && --(head->refcount) == 0) {
106  ReferenceListNode *next;
107 
108  for (ReferenceListNode *p = head; p != NULL; p = next) {
109  next = p->next;
110  if (p == head) {
111  delete (ReferenceListHeadNode *)p;
112  } else {
113  delete p;
114  }
115  }
116  }
117 }
118 
119 ReferenceListIterator ReferenceList::begin() const
120 {
121  return ReferenceListIterator(head);
122 }
123 
124 ReferenceListIterator ReferenceList::end() const
125 {
126  return ReferenceListIterator(NULL);
127 }
128 
129 
130 // ReferenceListIterator
131 
132 
133 ReferenceListIterator::ReferenceListIterator(ReferenceListNode *n) :
134  node(n)
135 {
136 }
137 
138 bool ReferenceListIterator::operator!=(const ReferenceListIterator &it) const
139 {
140  return node != it.node;
141 }
142 
143 const Reference *ReferenceListIterator::operator->() const
144 {
145  return &node->reference;
146 }
147 
148 const Reference &ReferenceListIterator::operator++(int /*i*/)
149 {
150  const Reference &ref = node->reference;
151  node = node->next;
152  return ref;
153 }
TDEStdAccel::next
const TDEShortcut & next()
KJS::ReferenceListIterator
An iterator for a ReferenceList.
Definition: reference_list.h:36
KJS::Reference
Defines a Javascript reference.
Definition: reference.h:34
KJS
Definition: array_instance.h:27
KJS::ReferenceList
A list of Reference objects.
Definition: reference_list.h:53

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