org.ceryle.wiki.plugin.assertion.filter
Class PredicateFilter

java.lang.Object
  org.ceryle.wiki.plugin.assertion.filter.PredicateFilter

All Implemented Interfaces:

QueryFilter

public class PredicateFilter
extends Object
implements QueryFilter

Filters the provided Collection of Associations with the optional Topic predicate, requiring a match on Association type.

Version:

$Id: PredicateFilter.java,v 1.2 2007-06-15 12:10:15 altheim Exp $

Author:

Murray Altheim

Constructor Summary

PredicateFilter()

Method Summary

Collection

filter(Collection associations, TopicMap topicmap, Object predicate) Returns a Collection of Associations in the TopicMap topicmap having a Scope indicating that they are based on Assertions.

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateFilter

public PredicateFilter()

Method Detail

filter

public Collection filter(Collection associations,
                         TopicMap topicmap,
                         Object predicate)
                  throws FilterException

Returns a Collection of Associations in the TopicMap topicmap having a Scope indicating that they are based on Assertions. The optional Topic type serves as a filter on the result: if non-null the resulting Collection will contain only those Associations having that type.

Specified by:

filter in interface QueryFilter

Parameters:

associations - the source Collection

topicmap - the TopicMap to query

predicate - the optional predicate/typing Topic

Returns:

a Collection containing the result of the query (never null)

Throws:

FilterException - if an error occurs during filter processing.

ClassCastException - if the filter is non-null and not the expected class.