/// <summary>
/// Instantiates a new PatternCondition object as a copy from the original condition; for parallelization.
/// </summary>
public Object Clone()
{
PatternCondition condition = new PatternCondition(ConditionExpression.Copy(""), NeededNodes, NeededEdges, NeededVariables, NeededVariableTypes);
condition.originalCondition = originalCondition;
condition.originalSubpatternEmbedding = originalSubpatternEmbedding;
return condition;
}
/// <summary>
/// Instantiates a new PatternCondition object as a copy from an original condition, used for inlining.
/// </summary>
/// <param name="original">The original condition to be copy constructed.</param>
/// <param name="inlinedSubpatternEmbedding">The embedding which just gets inlined.</param>
/// <param name="renameSuffix">The rename suffix to be applied to all the nodes, edges, and variables used.</param>
public PatternCondition(PatternCondition original, PatternGraphEmbedding inlinedSubpatternEmbedding, string renameSuffix)
{
originalCondition = original;
originalSubpatternEmbedding = inlinedSubpatternEmbedding;
ConditionExpression = (Expression)original.ConditionExpression.Copy(renameSuffix);
NeededNodes = new String[original.NeededNodes.Length];
for(int i = 0; i < original.NeededNodes.Length; ++i)
NeededNodes[i] = original.NeededNodes[i] + renameSuffix;
NeededEdges = new String[original.NeededEdges.Length];
for(int i = 0; i < original.NeededEdges.Length; ++i)
NeededEdges[i] = original.NeededEdges[i] + renameSuffix;
NeededVariables = new String[original.NeededVariables.Length];
for(int i = 0; i < original.NeededVariables.Length; ++i)
NeededVariables[i] = original.NeededVariables[i] + renameSuffix;
NeededVariableTypes = (VarType[])original.NeededVariableTypes.Clone();
}
/// <summary>
/// Interpretation plan operations implementing the
/// CheckCondition search plan operation
/// are created and inserted into the interpretation plan at the insertion point
/// </summary>
private void buildCondition(
InterpretationPlan insertionPoint, int index,
PatternCondition condition)
{
// check condition
expression.AreAttributesEqual aae = (expression.AreAttributesEqual)condition.ConditionExpression;
foreach(SearchPlanNode spn in spg.Nodes)
{
if(spn.PatternElement == aae.thisInPattern)
{
InterpretationPlanCheckCondition checkCondition;
if(spn is SearchPlanNodeNode)
{
SearchPlanNodeNode nodeNode = (SearchPlanNodeNode)spn;
checkCondition = new InterpretationPlanCheckCondition(
aae, nodeNode.nodeMatcher, Array.IndexOf(aae.thisInPattern.pointOfDefinition.nodes, aae.thisInPattern));
}
else
{
SearchPlanEdgeNode edgeNode = (SearchPlanEdgeNode)spn;
checkCondition = new InterpretationPlanCheckCondition(
aae, edgeNode.edgeMatcher, Array.IndexOf(aae.thisInPattern.pointOfDefinition.edges, aae.thisInPattern));
}
checkCondition.prev = insertionPoint;
insertionPoint.next = checkCondition;
insertionPoint = insertionPoint.next;
// continue with next operation
BuildInterpretationPlan(insertionPoint, index + 1);
return;
}
}
throw new Exception("Internal error constructing interpretation plan!");
}
/// <summary>
/// Inserts conditions into the schedule given by the operations list at their earliest possible position
/// todo: set/map operations are potentially expensive,
/// they shouldn't be insertes asap, but depending an weight,
/// derived from statistics over set/map size for graph elements, quiet well known for anonymous rule sets
/// </summary>
public void InsertConditionsIntoSchedule(PatternCondition[] conditions, List<SearchOperation> operations)
{
// get needed (in order to evaluate it) elements of each condition
Dictionary<String, bool>[] neededElements = new Dictionary<String, bool>[conditions.Length];
for(int i = 0; i < conditions.Length; ++i)
{
neededElements[i] = new Dictionary<string, bool>();
foreach(String neededNode in conditions[i].NeededNodes)
neededElements[i][neededNode] = true;
foreach(String neededEdge in conditions[i].NeededEdges)
neededElements[i][neededEdge] = true;
foreach(String neededVariable in conditions[i].NeededVariables)
neededElements[i][neededVariable] = true;
}
// iterate over all conditions
for(int i = 0; i < conditions.Length; ++i)
{
int j;
float costToEnd = 0;
// find leftmost place in scheduled search plan for current condition
// by search from end of schedule forward until the first element the condition is dependent on is found
for(j = operations.Count - 1; j >= 0; --j)
{
SearchOperation op = operations[j];
if(op.Type == SearchOperationType.Condition
|| op.Type == SearchOperationType.NegativePattern
|| op.Type == SearchOperationType.IndependentPattern
|| op.Type == SearchOperationType.DefToBeYieldedTo)
{
continue;
}
if(LazyNegativeIndependentConditionEvaluation)
{
break;
}
if(op.Type == SearchOperationType.AssignVar)
{
if(neededElements[i].ContainsKey(((PatternVariable)op.Element).Name))
{
costToEnd = op.CostToEnd;
break;
}
continue;
}
if(neededElements[i].ContainsKey(((SearchPlanNode)op.Element).PatternElement.Name))
{
costToEnd = op.CostToEnd;
break;
}
}
operations.Insert(j + 1, new SearchOperation(SearchOperationType.Condition,
conditions[i], null, costToEnd));
}
}
/// <summary>
/// Search program operations implementing the
/// Condition search plan operation
/// are created and inserted into search program
/// </summary>
private SearchProgramOperation buildCondition(
SearchProgramOperation insertionPoint,
int currentOperationIndex,
PatternCondition condition)
{
// generate c#-code-string out of condition expression ast
SourceBuilder conditionExpression = new SourceBuilder();
condition.ConditionExpression.Emit(conditionExpression);
// check condition with current partial match
CheckPartialMatchByCondition checkCondition =
new CheckPartialMatchByCondition(conditionExpression.ToString(),
condition.NeededNodes,
condition.NeededEdges,
condition.NeededVariables);
insertionPoint = insertionPoint.Append(checkCondition);
//---------------------------------------------------------------------------
// build next operation
insertionPoint = BuildScheduledSearchPlanOperationIntoSearchProgram(
currentOperationIndex + 1,
insertionPoint);
//---------------------------------------------------------------------------
return insertionPoint;
}
