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package org.apache.lucene.facet.index.categorypolicy;
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import org.apache.lucene.facet.taxonomy.CategoryPath;
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import org.apache.lucene.facet.taxonomy.TaxonomyReader;
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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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* This class filters our the ROOT category, and it's direct descendants. For
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* more information see {@link PathPolicy}.
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* @lucene.experimental
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public class NonTopLevelPathPolicy implements PathPolicy {
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* The shortest path length delivered is two components (root + one child).
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public final int DEFAULT_MINIMAL_SUBPATH_LENGTH = 2;
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* Filters out (returns false) CategoryPaths equal or less than
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* {@link TaxonomyReader#ROOT_ORDINAL}. true otherwise.
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public boolean shouldAdd(CategoryPath categoryPath) {
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return categoryPath.length() >= DEFAULT_MINIMAL_SUBPATH_LENGTH;