src/Lucene.Net.Tests.QueryParser/Xml/CachedFilter.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->
<FilteredQuery>
	<Query>
		<BooleanQuery fieldName="contents">
			<Clause occurs="should">
				<TermQuery>merger</TermQuery>
			</Clause>
			<Clause occurs="mustnot">
				<TermQuery >sumitomo</TermQuery>		
			</Clause>
		</BooleanQuery>
	</Query>
	
	<Filter>
		<!--
			CachedFilter elements can contain any Query or Filter. 
			CachedFilters are cached in an LRU Cache keyed on the contained query/filter object. 
			Using this will speed up overall performance for repeated uses of the same expensive 
			query/filter. The sorts of queries likely to benefit from caching need not necessarily be 
			complex - e.g. simple TermQuerys with a large DF (document frequency) can be expensive
			on large indexes. A good example of this might be a term query on a field with only 2 possible 
			values - "true" or "false". In a large index, querying or filtering on this field requires 
			reading millions of document ids from disk which can more usefully be cached as a 
			QueryFilter bitset.
			
			For Queries/Filters to be cached and reused the object must implement hashcode and
			equals methods correctly so that duplicate queries/filters can be detected in the cache.
			
			The CoreParser.maxNumCachedFilters property can be used to control the size
			of the LRU Cache established during the construction of CoreParser instances.
			-->
		<CachedFilter>
			<!-- Example query to be cached for fast, repeated use -->
			<TermQuery fieldName="contents">bank</TermQuery> 
			<!-- Alternatively, a filter object can be cached ....
				<RangeFilter fieldName="date" lowerTerm="19870409" upperTerm="19870412"/>
			-->				
		</CachedFilter>
	</Filter>
	
</FilteredQuery>