org.apache.directory.server.xdbm.search.evaluator

Class EmptyEvaluator

java.lang.Object

org.apache.directory.server.xdbm.search.evaluator.EmptyEvaluator

All Implemented Interfaces:

Evaluator<org.apache.directory.api.ldap.model.filter.UndefinedNode>

public class EmptyEvaluator
extends java.lang.Object
implements Evaluator<org.apache.directory.api.ldap.model.filter.UndefinedNode>

An Evaluator that always return false, for the case we have no entry to return

Constructor Summary

Constructors

Constructor and Description
EmptyEvaluator() Create a new instance of the PassThroughEvaluator

Method Summary

Modifier and Type	Method and Description
boolean	evaluate(org.apache.directory.api.ldap.model.entry.Entry entry) Evaluates whether or not a candidate, satisfies the expression associated with this Evaluator .
boolean	evaluate(IndexEntry<?,java.lang.String> indexEntry) Evaluates a candidate to determine if a filter expression selects it.
org.apache.directory.api.ldap.model.filter.UndefinedNode	getExpression() Gets the expression used by this expression Evaluator.
java.lang.String	toString()
java.lang.String	toString(java.lang.String tabs) Pretty-print an Evaluator

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyEvaluator

public EmptyEvaluator()

Create a new instance of the PassThroughEvaluator

Throws:

java.lang.Exception

Method Detail

evaluate

public boolean evaluate(IndexEntry<?,java.lang.String> indexEntry)
                 throws org.apache.directory.api.ldap.model.exception.LdapException

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.

Specified by:

evaluate in interface Evaluator<org.apache.directory.api.ldap.model.filter.UndefinedNode>

Parameters:

indexEntry - the index record of the entry to evaluate

Returns:

true if filter selects the candidate false otherwise

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

evaluate

public boolean evaluate(org.apache.directory.api.ldap.model.entry.Entry entry)
                 throws java.lang.Exception

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

Specified by:

evaluate in interface Evaluator<org.apache.directory.api.ldap.model.filter.UndefinedNode>

Parameters:

entry - the candidate entry

Returns:

true if filter selects the candidate false otherwise

Throws:

java.lang.Exception - if there are faults during evaluation

getExpression

public org.apache.directory.api.ldap.model.filter.UndefinedNode getExpression()

Gets the expression used by this expression Evaluator.

Specified by:

getExpression in interface Evaluator<org.apache.directory.api.ldap.model.filter.UndefinedNode>

Returns:

the AST for the expression

toString

public java.lang.String toString(java.lang.String tabs)

Description copied from interface: Evaluator

Pretty-print an Evaluator

Specified by:

toString in interface Evaluator<org.apache.directory.api.ldap.model.filter.UndefinedNode>

Parameters:

tabs - The tabs to add before the evaluator

Returns:

The pretty-printed evaluator and its descendants

See Also:

Object.toString()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()