/// <summary>
/// Looks at the key and index(aka.left and right) properties of the 2 streams and checks
/// for each property if any equivalent index properties exist for other streams.
/// Example: s0.p0 = s1.p1 and s1.p1 = s2.p2 ==> therefore s0.p0 = s2.p2
/// ==> look stream s0, property p0; indexed stream s1, property p1
/// Is there any other lookup stream that has stream 1 and property p1 as index property? ==> this is stream s2, p2
/// Add navigation entry between stream s0 and property p0 to stream s2, property p2
/// </summary>
private static bool FillEquivalentNav(
EventType[] typesPerStream,
QueryGraphForge queryGraph,
int lookupStream,
string keyProp,
int indexedStream,
string indexProp)
{
var addedEquivalency = false;
for (var otherStream = 0; otherStream < queryGraph.NumStreams; otherStream++) {
if (otherStream == lookupStream || otherStream == indexedStream) {
continue;
}
var value = queryGraph.GetGraphValue(otherStream, indexedStream);
QueryGraphValuePairHashKeyIndexForge hashKeys = value.HashKeyProps;
var otherStrictKeyProps = hashKeys.StrictKeys;
var otherIndexProps = hashKeys.Indexed;
var otherPropertyNum = -1;
if (otherIndexProps == null) {
continue;
}
for (var i = 0; i < otherIndexProps.Length; i++) {
if (otherIndexProps[i].Equals(indexProp)) {
otherPropertyNum = i;
break;
}
}
if (otherPropertyNum != -1) {
if (otherStrictKeyProps[otherPropertyNum] != null) {
ExprIdentNode identNodeLookup = new ExprIdentNodeImpl(
typesPerStream[lookupStream],
keyProp,
lookupStream);
ExprIdentNode identNodeOther = new ExprIdentNodeImpl(
typesPerStream[otherStream],
otherStrictKeyProps[otherPropertyNum],
otherStream);
var added = queryGraph.AddStrictEquals(
lookupStream,
keyProp,
identNodeLookup,
otherStream,
otherStrictKeyProps[otherPropertyNum],
identNodeOther);
if (added) {
addedEquivalency = true;
}
}
}
}
return addedEquivalency;
}
/// <summary>
/// Looks at the key and index (aka. left and right) properties of the 2 streams and checks
/// for each property if any equivalent index properties exist for other streams.
/// </summary>
/// <exception cref="IllegalStateException">Unexpected key and index property number mismatch</exception>
private static bool FillEquivalentNav(
EventType[] typesPerStream,
QueryGraphForge queryGraph,
int lookupStream,
int indexedStream)
{
var addedEquivalency = false;
var value = queryGraph.GetGraphValue(lookupStream, indexedStream);
if (value.IsEmptyNotNavigable) {
return false;
}
QueryGraphValuePairHashKeyIndexForge hashKeys = value.HashKeyProps;
var strictKeyProps = hashKeys.StrictKeys;
var indexProps = hashKeys.Indexed;
if (strictKeyProps.Length == 0) {
return false;
}
if (strictKeyProps.Length != indexProps.Length) {
throw new IllegalStateException("Unexpected key and index property number mismatch");
}
for (var i = 0; i < strictKeyProps.Length; i++) {
if (strictKeyProps[i] == null) {
continue; // not a strict key
}
var added = FillEquivalentNav(
typesPerStream,
queryGraph,
lookupStream,
strictKeyProps[i],
indexedStream,
indexProps[i]);
if (added) {
addedEquivalency = true;
}
}
return addedEquivalency;
}
