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package org.apache.lucene.facet.index.categorypolicy;
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import org.apache.lucene.facet.taxonomy.TaxonomyReader;
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import org.apache.lucene.facet.taxonomy.TaxonomyWriter;
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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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* Filter out any "top level" category ordinals. <br> {@link #shouldAdd(int)}.
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* @lucene.experimental
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public class NonTopLevelOrdinalPolicy implements OrdinalPolicy {
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* The taxonomyWriter with which the given ordinals' parent is determined.
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private TaxonomyWriter taxonomyWriter;
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* Constructs a new non-top-level-ordinal-filter. With a given
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public NonTopLevelOrdinalPolicy() {
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this.taxonomyWriter = null;
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* @param taxonomyWriter
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* A relevant taxonomyWriter object, with which ordinals sent to
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* {@link #shouldAdd(int)} are examined.
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public void init(TaxonomyWriter taxonomyWriter) {
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this.taxonomyWriter = taxonomyWriter;
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* Filters out ordinal which are ROOT or who's parent is ROOT. In order to
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* determine if a parent is root, there's a need for
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* {@link TaxonomyWriter#getParent(int)}.
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public boolean shouldAdd(int ordinal) {
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if (ordinal > TaxonomyReader.ROOT_ORDINAL) {
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if (this.taxonomyWriter.getParent(ordinal) > TaxonomyReader.ROOT_ORDINAL) {
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} catch (Exception e) {