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