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Diffstat (limited to 'dom/base/nsPropertyTable.h')
| -rw-r--r-- | dom/base/nsPropertyTable.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/dom/base/nsPropertyTable.h b/dom/base/nsPropertyTable.h new file mode 100644 index 000000000..9a82d4163 --- /dev/null +++ b/dom/base/nsPropertyTable.h @@ -0,0 +1,199 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This Original Code has been modified by IBM Corporation. Modifications made by IBM + * described herein are Copyright (c) International Business Machines Corporation, 2000. + * Modifications to Mozilla code or documentation identified per MPL Section 3.3 + * + * Date Modified by Description of modification + * 04/20/2000 IBM Corp. OS/2 VisualAge build. + */ + +/** + * nsPropertyTable allows a set of arbitrary key/value pairs to be stored + * for any number of nodes, in a global hashtable rather than on the nodes + * themselves. Nodes can be any type of object; the hashtable keys are + * nsIAtom pointers, and the values are void pointers. + */ + +#ifndef nsPropertyTable_h_ +#define nsPropertyTable_h_ + +#include "mozilla/MemoryReporting.h" +#include "nscore.h" + +class nsIAtom; + +typedef void +(*NSPropertyFunc)(void *aObject, + nsIAtom *aPropertyName, + void *aPropertyValue, + void *aData); + +/** + * Callback type for property destructors. |aObject| is the object + * the property is being removed for, |aPropertyName| is the property + * being removed, |aPropertyValue| is the value of the property, and |aData| + * is the opaque destructor data that was passed to SetProperty(). + **/ +typedef NSPropertyFunc NSPropertyDtorFunc; +class nsINode; +class nsIFrame; + +class nsPropertyOwner +{ +public: + nsPropertyOwner(const nsPropertyOwner& aOther) : mObject(aOther.mObject) {} + + // These are the types of objects that can own properties. No object should + // inherit more then one of these classes. + // To add support for more types just add to this list. + MOZ_IMPLICIT nsPropertyOwner(const nsINode* aObject) : mObject(aObject) {} + MOZ_IMPLICIT nsPropertyOwner(const nsIFrame* aObject) : mObject(aObject) {} + + operator const void*() { return mObject; } + const void* get() { return mObject; } + +private: + const void* mObject; +}; + +class nsPropertyTable +{ + public: + /** + * Get the value of the property |aPropertyName| for node |aObject|. + * |aResult|, if supplied, is filled in with a return status code. + **/ + void* GetProperty(nsPropertyOwner aObject, + nsIAtom *aPropertyName, + nsresult *aResult = nullptr) + { + return GetPropertyInternal(aObject, aPropertyName, false, aResult); + } + + /** + * Set the value of the property |aPropertyName| to + * |aPropertyValue| for node |aObject|. |aDtor| is a destructor for the + * property value to be called if the property is removed. It can be null + * if no destructor is required. |aDtorData| is an optional pointer to an + * opaque context to be passed to the property destructor. Note that the + * destructor is global for each property name regardless of node; it is an + * error to set a given property with a different destructor than was used + * before (this will return NS_ERROR_INVALID_ARG). If aOldValue is non-null + * it will contain the old value after the function returns (the destructor + * for the old value will not be run in that case). If |aTransfer| is true + * the property will be transfered to the new table when the property table + * for |aObject| changes (currently the tables for nodes are owned by their + * ownerDocument, so if the ownerDocument for a node changes, its property + * table changes too). If |aTransfer| is false the property will just be + * deleted instead. + */ + nsresult SetProperty(nsPropertyOwner aObject, + nsIAtom *aPropertyName, + void *aPropertyValue, + NSPropertyDtorFunc aDtor, + void *aDtorData, + bool aTransfer = false, + void **aOldValue = nullptr) + { + return SetPropertyInternal(aObject, aPropertyName, aPropertyValue, + aDtor, aDtorData, aTransfer, aOldValue); + } + + /** + * Delete the property |aPropertyName| in the global category for object + * |aObject|. The property's destructor function will be called. + */ + nsresult DeleteProperty(nsPropertyOwner aObject, + nsIAtom *aPropertyName); + + /** + * Unset the property |aPropertyName| in the global category for object + * |aObject|, but do not call the property's destructor function. The + * property value is returned. + */ + void* UnsetProperty(nsPropertyOwner aObject, + nsIAtom *aPropertyName, + nsresult *aStatus = nullptr) + { + return GetPropertyInternal(aObject, aPropertyName, true, aStatus); + } + + /** + * Deletes all of the properties for object |aObject|, calling the + * destructor function for each property. + */ + void DeleteAllPropertiesFor(nsPropertyOwner aObject); + + /** + * Transfers all properties for object |aObject| that were set with the + * |aTransfer| argument as true to |aTable|. Deletes the other properties + * for object |aObject|, calling the destructor function for each property. + * If transfering a property fails, this deletes all the properties for + * object |aObject|. + */ + nsresult + TransferOrDeleteAllPropertiesFor(nsPropertyOwner aObject, + nsPropertyTable *aOtherTable); + + /** + * Enumerate the properties for object |aObject|. + * For every property |aCallback| will be called with as arguments |aObject|, + * the property name, the property value and |aData|. + */ + void Enumerate(nsPropertyOwner aObject, + NSPropertyFunc aCallback, void *aData); + + /** + * Enumerate all the properties. + * For every property |aCallback| will be called with arguments the owner, + * the property name, the property value and |aData|. + */ + void EnumerateAll(NSPropertyFunc aCallback, void *aData); + + /** + * Deletes all of the properties for all objects in the property + * table, calling the destructor function for each property. + */ + void DeleteAllProperties(); + + nsPropertyTable() : mPropertyList(nullptr) {} + ~nsPropertyTable() { + DeleteAllProperties(); + } + + /** + * Function useable as destructor function for property data that is + * XPCOM objects. The function will call NS_IF_RELASE on the value + * to destroy it. + */ + static void SupportsDtorFunc(void *aObject, nsIAtom *aPropertyName, + void *aPropertyValue, void *aData); + + class PropertyList; + + size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + + private: + void DestroyPropertyList(); + PropertyList* GetPropertyListFor(nsIAtom *aPropertyName) const; + void* GetPropertyInternal(nsPropertyOwner aObject, + nsIAtom *aPropertyName, + bool aRemove, + nsresult *aStatus); + nsresult SetPropertyInternal(nsPropertyOwner aObject, + nsIAtom *aPropertyName, + void *aPropertyValue, + NSPropertyDtorFunc aDtor, + void *aDtorData, + bool aTransfer, + void **aOldValue); + + PropertyList *mPropertyList; +}; +#endif |