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package org.apache.solr.spelling.suggest.fst;
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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 org.apache.lucene.search.suggest.Lookup;
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import org.apache.lucene.search.suggest.fst.FSTLookup;
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import org.apache.solr.common.util.NamedList;
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import org.apache.solr.core.SolrCore;
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import org.apache.solr.spelling.suggest.LookupFactory;
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* Factory for {@link FSTLookup}
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public class FSTLookupFactory extends LookupFactory {
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* The number of separate buckets for weights (discretization). The more buckets,
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* the more fine-grained term weights (priorities) can be assigned. The speed of lookup
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* will not decrease for prefixes which have highly-weighted completions (because these
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* are filled-in first), but will decrease significantly for low-weighted terms (but
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* these should be infrequent, so it is all right).
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* <p>The number of buckets must be within [1, 255] range.
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public static final String WEIGHT_BUCKETS = "weightBuckets";
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* If <code>true</code>, exact suggestions are returned first, even if they are prefixes
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* of other strings in the automaton (possibly with larger weights).
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public static final String EXACT_MATCH_FIRST = "exactMatchFirst";
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public Lookup create(NamedList params, SolrCore core) {
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int buckets = params.get(WEIGHT_BUCKETS) != null
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? Integer.parseInt(params.get(WEIGHT_BUCKETS).toString())
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boolean exactMatchFirst = params.get(EXACT_MATCH_FIRST) != null
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? Boolean.valueOf(params.get(EXACT_MATCH_FIRST).toString())
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return new FSTLookup(buckets, exactMatchFirst);