net.ontopia.topicmaps.query.impl.basic
Class RulePredicate

java.lang.Object
  net.ontopia.topicmaps.query.impl.basic.AbstractQueryProcessor
      net.ontopia.topicmaps.query.impl.basic.RulePredicate

All Implemented Interfaces:

BasicPredicateIF, PredicateIF

Direct Known Subclasses:

RulePredicate

public class RulePredicate
extends AbstractQueryProcessor
implements BasicPredicateIF

INTERNAL: Implements rule predicates.

Field Summary

protected ParsedRule	rule
protected String	signature

Constructor Summary

RulePredicate(ParsedRule rule)

Method Summary

boolean	equals(Object obj)
List	getClauses()
int	getCost(boolean[] boundparams) INTERNAL.
String	getName() INTERNAL: Returns the name of the predicate.
List	getParameters()
String	getSignature() INTERNAL: Returns a string representing the signature of the predicate.
boolean	replaceable() INTERNAL: Checks to see if this rule is simply an alias.
QueryMatches	satisfy(QueryMatches extmatches, Object[] extarguments)
PredicateClause	translate(List arguments) INTERNAL: Creates a new PredicateClause representing the content of this rule inlined in an environment where the arguments in the args parameter have been passed to the predicate.

Methods inherited from class net.ontopia.topicmaps.query.impl.basic.AbstractQueryProcessor

findClauseItems, findClauseVariables, satisfy

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

rule

protected ParsedRule rule

signature

protected String signature

Constructor Detail

RulePredicate

public RulePredicate(ParsedRule rule)

Method Detail

getName

public String getName()

Description copied from interface: PredicateIF

INTERNAL: Returns the name of the predicate. This will usually be the name of the predicate within its module ('instance-of', '/=', 'starts-with'), but some virtual predicates cannot be reached from the syntax and may return names that will not parse.

Specified by:

getName in interface PredicateIF

getSignature

public String getSignature()
                    throws InvalidQueryException

Description copied from interface: PredicateIF

INTERNAL: Returns a string representing the signature of the predicate. The string consists of a whitespace-separated list of arguments, where each argument is made up of tokens representing the type or cardinality of that argument.

The instance-of predicate would have a signature of "t t", while /= would have ". .", and in would have ". .+". For full details, see topicmaps.impl.utils.ArgumentValidator.

Specified by:

getSignature in interface PredicateIF

Throws:

InvalidQueryException

getCost

public int getCost(boolean[] boundparams)

Description copied from interface: PredicateIF

INTERNAL.

Specified by:

getCost in interface PredicateIF

satisfy

public QueryMatches satisfy(QueryMatches extmatches,
                            Object[] extarguments)
                     throws InvalidQueryException

Specified by:

satisfy in interface BasicPredicateIF

Throws:

InvalidQueryException

getClauses

public List getClauses()

getParameters

public List getParameters()

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

replaceable

public boolean replaceable()

INTERNAL: Checks to see if this rule is simply an alias. If it is the optimizer can do an inline replacement of it to optimize other rules as well as queries that use it.

translate

public PredicateClause translate(List arguments)

INTERNAL: Creates a new PredicateClause representing the content of this rule inlined in an environment where the arguments in the args parameter have been passed to the predicate.