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package org.apache.lucene.search;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import org.apache.lucene.index.IndexReader;
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* Provides caching of {@link org.apache.lucene.search.Filter}s themselves on the remote end of an RMI connection.
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* The cache is keyed on Filter's hashCode(), so if it sees the same filter twice
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* it will reuse the original version.
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* NOTE: This does NOT cache the Filter bits, but rather the Filter itself.
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* Thus, this works hand-in-hand with {@link org.apache.lucene.search.CachingWrapperFilter} to keep both
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* file Filter cache and the Filter bits on the remote end, close to the searcher.
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* To cache a result you must do something like
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* RemoteCachingWrapperFilter f = new RemoteCachingWrapperFilter(new CachingWrapperFilter(myFilter));
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* @deprecated This package (all of contrib/remote) will be
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public class RemoteCachingWrapperFilter extends Filter {
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protected Filter filter;
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public RemoteCachingWrapperFilter(Filter filter) {
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* Uses the {@link org.apache.lucene.search.FilterManager} to keep the cache for a filter on the
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* searcher side of a remote connection.
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* @param reader the index reader for the Filter
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* @return the DocIdSet
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public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
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Filter cachedFilter = FilterManager.getInstance().getFilter(filter);
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return cachedFilter.getDocIdSet(reader);