org.apache.directory.server.xdbm.search.impl
Class ApproximateEvaluator<T,ID extends Comparable<ID>>

java.lang.Object
  org.apache.directory.server.xdbm.search.impl.LeafEvaluator<T,ID>
      org.apache.directory.server.xdbm.search.impl.ApproximateEvaluator<T,ID>

All Implemented Interfaces:

Evaluator<org.apache.directory.shared.ldap.model.filter.SimpleNode<T>,org.apache.directory.shared.ldap.model.entry.Entry,ID>

public class ApproximateEvaluator<T,ID extends Comparable<ID>>
extends LeafEvaluator<T,ID>

An Evaluator which determines if candidates are matched by ApproximateNode assertions. Same as equality for now.

Author:

Apache Directory Project

Field Summary

Fields inherited from class org.apache.directory.server.xdbm.search.impl.LeafEvaluator

attributeType, db, idx, ldapComparator, node, normalizer, schemaManager

Constructor Summary

ApproximateEvaluator(org.apache.directory.shared.ldap.model.filter.ApproximateNode<T> node, Store<org.apache.directory.shared.ldap.model.entry.Entry,ID> db, org.apache.directory.shared.ldap.model.schema.SchemaManager schemaManager)
Creates a new ApproximateEvaluator

Method Summary

boolean	evaluate(IndexEntry<?,ID> indexEntry) Evaluates a candidate to determine if a filter expression selects it.
boolean	evaluateEntry(org.apache.directory.shared.ldap.model.entry.Entry entry) Evaluates whether or not a candidate, satisfies the expression associated with this Evaluator .
org.apache.directory.shared.ldap.model.filter.ApproximateNode<T>	getExpression() Gets the expression used by this expression Evaluator.

Methods inherited from class org.apache.directory.server.xdbm.search.impl.LeafEvaluator

getAttributeType, getComparator, getNormalizer

Methods inherited from class java.lang.Object

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

Constructor Detail

ApproximateEvaluator

public ApproximateEvaluator(org.apache.directory.shared.ldap.model.filter.ApproximateNode<T> node,
                            Store<org.apache.directory.shared.ldap.model.entry.Entry,ID> db,
                            org.apache.directory.shared.ldap.model.schema.SchemaManager schemaManager)
                     throws Exception

Creates a new ApproximateEvaluator

Parameters:

node - The ApproximateNode

db - The Store

schemaManager - The SchemaManager

Throws:

Exception - If the creation failed

Method Detail

getExpression

public org.apache.directory.shared.ldap.model.filter.ApproximateNode<T> getExpression()

Gets the expression used by this expression Evaluator.

Returns:

the AST for the expression

evaluateEntry

public boolean evaluateEntry(org.apache.directory.shared.ldap.model.entry.Entry entry)
                      throws Exception

Evaluates whether or not a candidate, satisfies the expression associated with this Evaluator .

Parameters:

entry - the candidate entry

Returns:

true if filter selects the candidate false otherwise

Throws:

Exception - if there are faults during evaluation

evaluate

public boolean evaluate(IndexEntry<?,ID> indexEntry)
                 throws Exception

Evaluates a candidate to determine if a filter expression selects it. If an IndexEntry does has a null reference to the entry object, this Evaluator may set it if it has to access the full entry within the master table of the store. Subsequent evaluations on the IndexEntry then need not access the store to retreive the entry if they need to access it's attributes.

Parameters:

indexEntry - the index record of the entry to evaluate

Returns:

true if filter selects the candidate false otherwise

Throws:

Exception - if there are faults during evaluation