private void CollectConflictsBetweenFragments(
ValidationContext context,
List <Conflict> conflicts,
Dictionary <SelectionSet, CachedField> cachedFieldsAndFragmentNames,
PairSet comparedFragmentPairs,
bool areMutuallyExclusive,
string fragmentName1,
string fragmentName2)
{
// No need to compare a fragment to itself.
if (fragmentName1 == fragmentName2)
{
return;
}
// Memoize so two fragments are not compared for conflicts more than once.
if (comparedFragmentPairs.Has(fragmentName1, fragmentName2, areMutuallyExclusive))
{
return;
}
comparedFragmentPairs.Add(fragmentName1, fragmentName2, areMutuallyExclusive);
var fragment1 = context.GetFragment(fragmentName1);
var fragment2 = context.GetFragment(fragmentName2);
if (fragment1 == null || fragment2 == null)
{
return;
}
var cachedField1 =
GetReferencedFieldsAndFragmentNames(
context,
cachedFieldsAndFragmentNames,
fragment1);
var fieldMap1 = cachedField1.NodeAndDef;
var fragmentNames1 = cachedField1.Names;
var cachedField2 =
GetReferencedFieldsAndFragmentNames(
context,
cachedFieldsAndFragmentNames,
fragment2);
var fieldMap2 = cachedField2.NodeAndDef;
var fragmentNames2 = cachedField2.Names;
// (F) First, collect all conflicts between these two collections of fields
// (not including any nested fragments).
CollectConflictsBetween(
context,
conflicts,
cachedFieldsAndFragmentNames,
comparedFragmentPairs,
areMutuallyExclusive,
fieldMap1,
fieldMap2);
// (G) Then collect conflicts between the first fragment and any nested
// fragments spread in the second fragment.
for (var j = 0; j < fragmentNames2.Count; j++)
{
CollectConflictsBetweenFragments(
context,
conflicts,
cachedFieldsAndFragmentNames,
comparedFragmentPairs,
areMutuallyExclusive,
fragmentName1,
fragmentNames2[j]);
}
// (G) Then collect conflicts between the second fragment and any nested
// fragments spread in the first fragment.
for (var i = 0; i < fragmentNames1.Count; i++)
{
CollectConflictsBetweenFragments(
context,
conflicts,
cachedFieldsAndFragmentNames,
comparedFragmentPairs,
areMutuallyExclusive,
fragmentNames1[i],
fragmentName2);
}
}