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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo
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Roy Tam
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342
dom/base/nsPropertyTable.cpp
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342
dom/base/nsPropertyTable.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "nsPropertyTable.h"
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#include "mozilla/MemoryReporting.h"
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#include "PLDHashTable.h"
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#include "nsError.h"
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#include "nsIAtom.h"
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struct PropertyListMapEntry : public PLDHashEntryHdr {
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const void *key;
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void *value;
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};
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//----------------------------------------------------------------------
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class nsPropertyTable::PropertyList {
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public:
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PropertyList(nsIAtom* aName,
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NSPropertyDtorFunc aDtorFunc,
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void* aDtorData,
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bool aTransfer);
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~PropertyList();
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// Removes the property associated with the given object, and destroys
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// the property value
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bool DeletePropertyFor(nsPropertyOwner aObject);
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// Destroy all remaining properties (without removing them)
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void Destroy();
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bool Equals(nsIAtom *aPropertyName)
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{
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return mName == aPropertyName;
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}
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
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nsCOMPtr<nsIAtom> mName; // property name
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PLDHashTable mObjectValueMap; // map of object/value pairs
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NSPropertyDtorFunc mDtorFunc; // property specific value dtor function
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void* mDtorData; // pointer to pass to dtor
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bool mTransfer; // whether to transfer in
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// TransferOrDeleteAllPropertiesFor
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PropertyList* mNext;
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};
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void
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nsPropertyTable::DeleteAllProperties()
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{
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while (mPropertyList) {
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PropertyList* tmp = mPropertyList;
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mPropertyList = mPropertyList->mNext;
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tmp->Destroy();
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delete tmp;
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}
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}
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void
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nsPropertyTable::DeleteAllPropertiesFor(nsPropertyOwner aObject)
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{
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for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
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prop->DeletePropertyFor(aObject);
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}
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}
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nsresult
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nsPropertyTable::TransferOrDeleteAllPropertiesFor(nsPropertyOwner aObject,
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nsPropertyTable *aOtherTable)
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{
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nsresult rv = NS_OK;
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for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
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if (prop->mTransfer) {
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auto entry = static_cast<PropertyListMapEntry*>
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(prop->mObjectValueMap.Search(aObject));
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if (entry) {
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rv = aOtherTable->SetProperty(aObject, prop->mName,
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entry->value, prop->mDtorFunc,
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prop->mDtorData, prop->mTransfer);
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if (NS_FAILED(rv)) {
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DeleteAllPropertiesFor(aObject);
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aOtherTable->DeleteAllPropertiesFor(aObject);
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break;
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}
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prop->mObjectValueMap.RemoveEntry(entry);
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}
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}
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else {
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prop->DeletePropertyFor(aObject);
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}
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}
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return rv;
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}
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void
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nsPropertyTable::Enumerate(nsPropertyOwner aObject,
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NSPropertyFunc aCallback, void *aData)
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{
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PropertyList* prop;
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for (prop = mPropertyList; prop; prop = prop->mNext) {
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auto entry = static_cast<PropertyListMapEntry*>
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(prop->mObjectValueMap.Search(aObject));
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if (entry) {
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aCallback(const_cast<void*>(aObject.get()), prop->mName, entry->value,
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aData);
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}
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}
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}
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void
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nsPropertyTable::EnumerateAll(NSPropertyFunc aCallBack, void* aData)
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{
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for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
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for (auto iter = prop->mObjectValueMap.Iter(); !iter.Done(); iter.Next()) {
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auto entry = static_cast<PropertyListMapEntry*>(iter.Get());
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aCallBack(const_cast<void*>(entry->key), prop->mName, entry->value,
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aData);
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}
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}
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}
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void*
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nsPropertyTable::GetPropertyInternal(nsPropertyOwner aObject,
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nsIAtom *aPropertyName,
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bool aRemove,
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nsresult *aResult)
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{
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NS_PRECONDITION(aPropertyName && aObject, "unexpected null param");
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nsresult rv = NS_PROPTABLE_PROP_NOT_THERE;
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void *propValue = nullptr;
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PropertyList* propertyList = GetPropertyListFor(aPropertyName);
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if (propertyList) {
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auto entry = static_cast<PropertyListMapEntry*>
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(propertyList->mObjectValueMap.Search(aObject));
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if (entry) {
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propValue = entry->value;
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if (aRemove) {
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// don't call propertyList->mDtorFunc. That's the caller's job now.
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propertyList->mObjectValueMap.RemoveEntry(entry);
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}
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rv = NS_OK;
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}
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}
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if (aResult)
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*aResult = rv;
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return propValue;
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}
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nsresult
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nsPropertyTable::SetPropertyInternal(nsPropertyOwner aObject,
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nsIAtom *aPropertyName,
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void *aPropertyValue,
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NSPropertyDtorFunc aPropDtorFunc,
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void *aPropDtorData,
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bool aTransfer,
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void **aOldValue)
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{
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NS_PRECONDITION(aPropertyName && aObject, "unexpected null param");
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PropertyList* propertyList = GetPropertyListFor(aPropertyName);
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if (propertyList) {
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// Make sure the dtor function and data and the transfer flag match
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if (aPropDtorFunc != propertyList->mDtorFunc ||
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aPropDtorData != propertyList->mDtorData ||
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aTransfer != propertyList->mTransfer) {
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NS_WARNING("Destructor/data mismatch while setting property");
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return NS_ERROR_INVALID_ARG;
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}
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} else {
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propertyList = new PropertyList(aPropertyName, aPropDtorFunc,
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aPropDtorData, aTransfer);
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propertyList->mNext = mPropertyList;
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mPropertyList = propertyList;
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}
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// The current property value (if there is one) is replaced and the current
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// value is destroyed
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nsresult result = NS_OK;
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auto entry = static_cast<PropertyListMapEntry*>
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(propertyList->mObjectValueMap.Add(aObject, mozilla::fallible));
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if (!entry)
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return NS_ERROR_OUT_OF_MEMORY;
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// A nullptr entry->key is the sign that the entry has just been allocated
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// for us. If it's non-nullptr then we have an existing entry.
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if (entry->key) {
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if (aOldValue)
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*aOldValue = entry->value;
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else if (propertyList->mDtorFunc)
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propertyList->mDtorFunc(const_cast<void*>(entry->key), aPropertyName,
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entry->value, propertyList->mDtorData);
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result = NS_PROPTABLE_PROP_OVERWRITTEN;
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}
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else if (aOldValue) {
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*aOldValue = nullptr;
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}
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entry->key = aObject;
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entry->value = aPropertyValue;
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return result;
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}
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nsresult
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nsPropertyTable::DeleteProperty(nsPropertyOwner aObject,
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nsIAtom *aPropertyName)
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{
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NS_PRECONDITION(aPropertyName && aObject, "unexpected null param");
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PropertyList* propertyList = GetPropertyListFor(aPropertyName);
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if (propertyList) {
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if (propertyList->DeletePropertyFor(aObject))
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return NS_OK;
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}
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return NS_PROPTABLE_PROP_NOT_THERE;
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}
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nsPropertyTable::PropertyList*
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nsPropertyTable::GetPropertyListFor(nsIAtom* aPropertyName) const
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{
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PropertyList* result;
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for (result = mPropertyList; result; result = result->mNext) {
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if (result->Equals(aPropertyName)) {
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break;
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}
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}
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return result;
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}
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//----------------------------------------------------------------------
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nsPropertyTable::PropertyList::PropertyList(nsIAtom *aName,
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NSPropertyDtorFunc aDtorFunc,
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void *aDtorData,
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bool aTransfer)
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: mName(aName),
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mObjectValueMap(PLDHashTable::StubOps(), sizeof(PropertyListMapEntry)),
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mDtorFunc(aDtorFunc),
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mDtorData(aDtorData),
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mTransfer(aTransfer),
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mNext(nullptr)
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{
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}
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nsPropertyTable::PropertyList::~PropertyList()
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{
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}
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void
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nsPropertyTable::PropertyList::Destroy()
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{
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// Enumerate any remaining object/value pairs and destroy the value object.
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if (mDtorFunc) {
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for (auto iter = mObjectValueMap.Iter(); !iter.Done(); iter.Next()) {
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auto entry = static_cast<PropertyListMapEntry*>(iter.Get());
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mDtorFunc(const_cast<void*>(entry->key), mName, entry->value, mDtorData);
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}
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}
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}
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bool
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nsPropertyTable::PropertyList::DeletePropertyFor(nsPropertyOwner aObject)
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{
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auto entry =
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static_cast<PropertyListMapEntry*>(mObjectValueMap.Search(aObject));
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if (!entry)
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return false;
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void* value = entry->value;
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mObjectValueMap.RemoveEntry(entry);
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if (mDtorFunc)
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mDtorFunc(const_cast<void*>(aObject.get()), mName, value, mDtorData);
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return true;
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}
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size_t
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nsPropertyTable::PropertyList::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
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{
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size_t n = aMallocSizeOf(this);
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n += mObjectValueMap.ShallowSizeOfExcludingThis(aMallocSizeOf);
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return n;
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}
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size_t
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nsPropertyTable::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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size_t n = 0;
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for (PropertyList *prop = mPropertyList; prop; prop = prop->mNext) {
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n += prop->SizeOfIncludingThis(aMallocSizeOf);
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}
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return n;
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}
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size_t
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nsPropertyTable::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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/* static */
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void
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nsPropertyTable::SupportsDtorFunc(void *aObject, nsIAtom *aPropertyName,
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void *aPropertyValue, void *aData)
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{
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nsISupports *propertyValue = static_cast<nsISupports*>(aPropertyValue);
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NS_IF_RELEASE(propertyValue);
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}
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