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comparison: content/base/src/nsPropertyTable.h

content/base/src/nsPropertyTable.h

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * vim:cindent:ts=2:et:sw=2:
3 *
4 * This Source Code Form is subject to the terms of the Mozilla Public
5 * License, v. 2.0. If a copy of the MPL was not distributed with this
6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
7 *
8 * This Original Code has been modified by IBM Corporation. Modifications made by IBM
9 * described herein are Copyright (c) International Business Machines Corporation, 2000.
10 * Modifications to Mozilla code or documentation identified per MPL Section 3.3
11 *
12 * Date Modified by Description of modification
13 * 04/20/2000 IBM Corp. OS/2 VisualAge build.
14 */
15
16 /**
17 * nsPropertyTable allows a set of arbitrary key/value pairs to be stored
18 * for any number of nodes, in a global hashtable rather than on the nodes
19 * themselves. Nodes can be any type of object; the hashtable keys are
20 * nsIAtom pointers, and the values are void pointers.
21 */
22
23 #ifndef nsPropertyTable_h_
24 #define nsPropertyTable_h_
25
26 #include "mozilla/MemoryReporting.h"
27 #include "nscore.h"
28
29 class nsIAtom;
30
31 typedef void
32 (*NSPropertyFunc)(void *aObject,
33 nsIAtom *aPropertyName,
34 void *aPropertyValue,
35 void *aData);
36
37 /**
38 * Callback type for property destructors. |aObject| is the object
39 * the property is being removed for, |aPropertyName| is the property
40 * being removed, |aPropertyValue| is the value of the property, and |aData|
41 * is the opaque destructor data that was passed to SetProperty().
42 **/
43 typedef NSPropertyFunc NSPropertyDtorFunc;
44 class nsINode;
45 class nsIFrame;
46
47 class nsPropertyOwner
48 {
49 public:
50 nsPropertyOwner(const nsPropertyOwner& aOther) : mObject(aOther.mObject) {}
51
52 // These are the types of objects that can own properties. No object should
53 // inherit more then one of these classes.
54 // To add support for more types just add to this list.
55 nsPropertyOwner(const nsINode* aObject) : mObject(aObject) {}
56 nsPropertyOwner(const nsIFrame* aObject) : mObject(aObject) {}
57
58 operator const void*() { return mObject; }
59 const void* get() { return mObject; }
60
61 private:
62 const void* mObject;
63 };
64
65 class nsPropertyTable
66 {
67 public:
68 /**
69 * Get the value of the property |aPropertyName| for node |aObject|.
70 * |aResult|, if supplied, is filled in with a return status code.
71 **/
72 void* GetProperty(nsPropertyOwner aObject,
73 nsIAtom *aPropertyName,
74 nsresult *aResult = nullptr)
75 {
76 return GetPropertyInternal(aObject, aPropertyName, false, aResult);
77 }
78
79 /**
80 * Set the value of the property |aPropertyName| to
81 * |aPropertyValue| for node |aObject|. |aDtor| is a destructor for the
82 * property value to be called if the property is removed. It can be null
83 * if no destructor is required. |aDtorData| is an optional pointer to an
84 * opaque context to be passed to the property destructor. Note that the
85 * destructor is global for each property name regardless of node; it is an
86 * error to set a given property with a different destructor than was used
87 * before (this will return NS_ERROR_INVALID_ARG). If aOldValue is non-null
88 * it will contain the old value after the function returns (the destructor
89 * for the old value will not be run in that case). If |aTransfer| is true
90 * the property will be transfered to the new table when the property table
91 * for |aObject| changes (currently the tables for nodes are owned by their
92 * ownerDocument, so if the ownerDocument for a node changes, its property
93 * table changes too). If |aTransfer| is false the property will just be
94 * deleted instead.
95 */
96 NS_HIDDEN_(nsresult) SetProperty(nsPropertyOwner aObject,
97 nsIAtom *aPropertyName,
98 void *aPropertyValue,
99 NSPropertyDtorFunc aDtor,
100 void *aDtorData,
101 bool aTransfer = false,
102 void **aOldValue = nullptr)
103 {
104 return SetPropertyInternal(aObject, aPropertyName, aPropertyValue,
105 aDtor, aDtorData, aTransfer, aOldValue);
106 }
107
108 /**
109 * Delete the property |aPropertyName| in the global category for object
110 * |aObject|. The property's destructor function will be called.
111 */
112 NS_HIDDEN_(nsresult) DeleteProperty(nsPropertyOwner aObject,
113 nsIAtom *aPropertyName);
114
115 /**
116 * Unset the property |aPropertyName| in the global category for object
117 * |aObject|, but do not call the property's destructor function. The
118 * property value is returned.
119 */
120 void* UnsetProperty(nsPropertyOwner aObject,
121 nsIAtom *aPropertyName,
122 nsresult *aStatus = nullptr)
123 {
124 return GetPropertyInternal(aObject, aPropertyName, true, aStatus);
125 }
126
127 /**
128 * Deletes all of the properties for object |aObject|, calling the
129 * destructor function for each property.
130 */
131 NS_HIDDEN_(void) DeleteAllPropertiesFor(nsPropertyOwner aObject);
132
133 /**
134 * Transfers all properties for object |aObject| that were set with the
135 * |aTransfer| argument as true to |aTable|. Deletes the other properties
136 * for object |aObject|, calling the destructor function for each property.
137 * If transfering a property fails, this deletes all the properties for
138 * object |aObject|.
139 */
140 NS_HIDDEN_(nsresult)
141 TransferOrDeleteAllPropertiesFor(nsPropertyOwner aObject,
142 nsPropertyTable *aOtherTable);
143
144 /**
145 * Enumerate the properties for object |aObject|.
146 * For every property |aCallback| will be called with as arguments |aObject|,
147 * the property name, the property value and |aData|.
148 */
149 NS_HIDDEN_(void) Enumerate(nsPropertyOwner aObject,
150 NSPropertyFunc aCallback, void *aData);
151
152 /**
153 * Enumerate all the properties.
154 * For every property |aCallback| will be called with arguments the owner,
155 * the property name, the property value and |aData|.
156 */
157 NS_HIDDEN_(void) EnumerateAll(NSPropertyFunc aCallback, void *aData);
158
159 /**
160 * Deletes all of the properties for all objects in the property
161 * table, calling the destructor function for each property.
162 */
163 NS_HIDDEN_(void) DeleteAllProperties();
164
165 nsPropertyTable() : mPropertyList(nullptr) {}
166 ~nsPropertyTable() {
167 DeleteAllProperties();
168 }
169
170 /**
171 * Function useable as destructor function for property data that is
172 * XPCOM objects. The function will call NS_IF_RELASE on the value
173 * to destroy it.
174 */
175 static void SupportsDtorFunc(void *aObject, nsIAtom *aPropertyName,
176 void *aPropertyValue, void *aData);
177
178 class PropertyList;
179
180 size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
181
182 private:
183 NS_HIDDEN_(void) DestroyPropertyList();
184 NS_HIDDEN_(PropertyList*) GetPropertyListFor(nsIAtom *aPropertyName) const;
185 NS_HIDDEN_(void*) GetPropertyInternal(nsPropertyOwner aObject,
186 nsIAtom *aPropertyName,
187 bool aRemove,
188 nsresult *aStatus);
189 NS_HIDDEN_(nsresult) SetPropertyInternal(nsPropertyOwner aObject,
190 nsIAtom *aPropertyName,
191 void *aPropertyValue,
192 NSPropertyDtorFunc aDtor,
193 void *aDtorData,
194 bool aTransfer,
195 void **aOldValue);
196
197 PropertyList *mPropertyList;
198 };
199 #endif

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