Package net.ontopia.topicmaps.query.impl.utils

Code shared between query implementations.

Interface Summary

Interface	Description
QueryExecuterIF	INTERNAL: This interface is implemented by QueryProcessorIFs.
QueryOptimizerIF	INTERNAL: Implemented by classes that know how to optimize tolog queries.
QueryTraceListenerIF	INTERNAL: Used for testing and timing of queries.

Class Summary

Class	Description
BindingContext	INTERNAL.
CostEstimator
CrossProduct	INTERNAL: Expected input is a map with arbitrary keys and values of Object[] type.
HierarchyWalkerRulePredicate	INTERNAL:
MultiCrossProduct	INTERNAL: Expected input is an array of maps with arbitrary keys and values of Object[] type.
PredicateDrivenCostEstimator
PredicateOptions	INTERNAL: Used as a special, "magic", argument to predicates, inserted by the query optimizer to tell them to behave differently.
PredicateSignature
Prefetcher	INTERNAL: Prefetching utility
QueryAnalyzer	INTERNAL: Analyzes the types of variables in the query.
QueryContext	INTERNAL: Used during traversal of queries to represent the context at any given point in the query.
QueryMatchesCollection	INTERNAL: A set implementation that wraps an QueryMatches instance and presents the values in one of the columns as a collection.
QueryMatchesUtils	INTERNAL: Various utility methods for working with QueryMatches objects.
QueryOptimizer	INTERNAL: An optimizer class that knows how to rewrite queries to equivalent, but more efficient queries.
QueryOptimizer.AbstractQueryOptimizer
QueryOptimizer.AddTypeToRolePlayer	INTERNAL:
QueryOptimizer.HierarchyWalker	Replaces simple recursive rules with a more efficient custom implementation that just wraps the recursive step.
QueryOptimizer.NextPreviousOptimizer	INTERNAL: Optimizes queries that look for the next or the previous value in a sequence from a given start value to not load all values and then do it the hard way, but instead to use a sorted index.
QueryOptimizer.PumpClause
QueryOptimizer.PumpPredicate
QueryOptimizer.RecursivePruner	This optimizer adds RemoveDuplicatesPredicate on both sides of recursive calls within predicate rules.
QueryOptimizer.Reorderer	INTERNAL: Optimizes the query by reordering the clauses into the optimal order for evaluation.
QueryOptimizer.RuleInliner	INTERNAL: Optimizes the query by inlining all rules which are simple aliases for a single predicate.
QueryOptimizer.StringPrefixOptimizer	INTERNAL: Optimizes queries that do lookup of occurrences by string value, then filter the string value by a prefix.
QueryOptimizer.TypeConflictResolver	Finds cases of conflicting variables and resolves them by replacing predicates which can never succeed with DynamicFailurePredicate.
SimpleCostEstimator
SimpleQueryTracer	INTERNAL: Used to get a trace from a specific query into a writer for ease of display.
TologQueryProcessorFactory	PUBLIC: