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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
#include "nsXULTemplateQueryProcessorRDF.h"
#include "nsXULTemplateResultRDF.h"
#include "nsRDFBinding.h"
#ifdef DEBUG
#include "nsXULContentUtils.h"
#endif
RDFBindingSet::~RDFBindingSet()
{
while (mFirst) {
RDFBinding* doomed = mFirst;
mFirst = mFirst->mNext;
delete doomed;
}
MOZ_COUNT_DTOR(RDFBindingSet);
}
nsresult
RDFBindingSet::AddBinding(nsIAtom* aVar, nsIAtom* aRef, nsIRDFResource* aPredicate)
{
RDFBinding* newbinding = new RDFBinding(aRef, aPredicate, aVar);
if (mFirst) {
RDFBinding* binding = mFirst;
while (binding) {
// the binding is dependant on the calculation of a previous binding
if (binding->mSubjectVariable == aVar)
newbinding->mHasDependency = true;
// if the target variable is already used in a binding, ignore it
// since it won't be useful for anything
if (binding->mTargetVariable == aVar) {
delete newbinding;
return NS_OK;
}
// add the binding at the end of the list
if (! binding->mNext) {
binding->mNext = newbinding;
break;
}
binding = binding->mNext;
}
}
else {
mFirst = newbinding;
}
mCount++;
return NS_OK;
}
bool
RDFBindingSet::SyncAssignments(nsIRDFResource* aSubject,
nsIRDFResource* aPredicate,
nsIRDFNode* aTarget,
nsIAtom* aMemberVariable,
nsXULTemplateResultRDF* aResult,
nsBindingValues& aBindingValues)
{
NS_ASSERTION(aBindingValues.GetBindingSet() == this,
"nsBindingValues not for this RDFBindingSet");
NS_PRECONDITION(aResult, "Must have result");
bool needSync = false;
nsCOMPtr<nsIRDFNode>* valuesArray = aBindingValues.ValuesArray();
if (!valuesArray)
return false;
RDFBinding* binding = mFirst;
int32_t count = 0;
// QI for proper comparisons just to be safe
nsCOMPtr<nsIRDFNode> subjectnode = do_QueryInterface(aSubject);
// iterate through the bindings looking for ones that would match the RDF
// nodes that were involved in a change
nsCOMPtr<nsIRDFNode> value;
while (binding) {
if (aPredicate == binding->mPredicate) {
// if the source of the binding is the member variable, optimize
if (binding->mSubjectVariable == aMemberVariable) {
valuesArray[count] = aTarget;
needSync = true;
}
else {
aResult->GetAssignment(binding->mSubjectVariable, getter_AddRefs(value));
if (value == subjectnode) {
valuesArray[count] = aTarget;
needSync = true;
}
}
}
binding = binding->mNext;
count++;
}
return needSync;
}
void
RDFBindingSet::AddDependencies(nsIRDFResource* aSubject,
nsXULTemplateResultRDF* aResult)
{
NS_PRECONDITION(aResult, "Must have result");
// iterate through the bindings and add binding dependencies to the
// processor
nsXULTemplateQueryProcessorRDF* processor = aResult->GetProcessor();
if (! processor)
return;
nsCOMPtr<nsIRDFNode> value;
RDFBinding* binding = mFirst;
while (binding) {
aResult->GetAssignment(binding->mSubjectVariable, getter_AddRefs(value));
nsCOMPtr<nsIRDFResource> valueres = do_QueryInterface(value);
if (valueres)
processor->AddBindingDependency(aResult, valueres);
binding = binding->mNext;
}
}
void
RDFBindingSet::RemoveDependencies(nsIRDFResource* aSubject,
nsXULTemplateResultRDF* aResult)
{
NS_PRECONDITION(aResult, "Must have result");
// iterate through the bindings and remove binding dependencies from the
// processor
nsXULTemplateQueryProcessorRDF* processor = aResult->GetProcessor();
if (! processor)
return;
nsCOMPtr<nsIRDFNode> value;
RDFBinding* binding = mFirst;
while (binding) {
aResult->GetAssignment(binding->mSubjectVariable, getter_AddRefs(value));
nsCOMPtr<nsIRDFResource> valueres = do_QueryInterface(value);
if (valueres)
processor->RemoveBindingDependency(aResult, valueres);
binding = binding->mNext;
}
}
int32_t
RDFBindingSet::LookupTargetIndex(nsIAtom* aTargetVariable, RDFBinding** aBinding)
{
int32_t idx = 0;
RDFBinding* binding = mFirst;
while (binding) {
if (binding->mTargetVariable == aTargetVariable) {
*aBinding = binding;
return idx;
}
idx++;
binding = binding->mNext;
}
return -1;
}
nsBindingValues::~nsBindingValues()
{
ClearBindingSet();
MOZ_COUNT_DTOR(nsBindingValues);
}
void
nsBindingValues::ClearBindingSet()
{
if (mBindings && mValues) {
delete [] mValues;
mValues = nullptr;
}
mBindings = nullptr;
}
nsresult
nsBindingValues::SetBindingSet(RDFBindingSet* aBindings)
{
ClearBindingSet();
int32_t count = aBindings->Count();
if (count) {
mValues = new nsCOMPtr<nsIRDFNode>[count];
mBindings = aBindings;
}
else {
mValues = nullptr;
}
return NS_OK;
}
void
nsBindingValues::GetAssignmentFor(nsXULTemplateResultRDF* aResult,
nsIAtom* aVar,
nsIRDFNode** aValue)
{
*aValue = nullptr;
// assignments are calculated lazily when asked for. The only issue is
// when a binding has no value in the RDF graph, it will be checked again
// every time.
if (mBindings && mValues) {
RDFBinding* binding;
int32_t idx = mBindings->LookupTargetIndex(aVar, &binding);
if (idx >= 0) {
*aValue = mValues[idx];
if (*aValue) {
NS_ADDREF(*aValue);
}
else {
nsXULTemplateQueryProcessorRDF* processor = aResult->GetProcessor();
if (! processor)
return;
nsIRDFDataSource* ds = processor->GetDataSource();
if (! ds)
return;
nsCOMPtr<nsIRDFNode> subjectValue;
aResult->GetAssignment(binding->mSubjectVariable,
getter_AddRefs(subjectValue));
if (subjectValue) {
nsCOMPtr<nsIRDFResource> subject = do_QueryInterface(subjectValue);
ds->GetTarget(subject, binding->mPredicate, true, aValue);
if (*aValue)
mValues[idx] = *aValue;
}
}
}
}
}
void
nsBindingValues::RemoveDependencies(nsIRDFResource* aSubject,
nsXULTemplateResultRDF* aResult)
{
if (mBindings)
mBindings->RemoveDependencies(aSubject, aResult);
}
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