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package org.apache.lucene.facet.index.params;
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import java.io.Serializable;
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import org.apache.lucene.facet.index.categorypolicy.OrdinalPolicy;
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import org.apache.lucene.facet.index.categorypolicy.PathPolicy;
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import org.apache.lucene.facet.taxonomy.CategoryPath;
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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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* Parameters on how facets are to be written to the index.
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* For example, which fields and terms are used to refer to the indexed posting list.
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* If non-default parameters were used during indexing, the same parameters
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* must also be passed during faceted search. This requirement is analogous
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* to the requirement during search to know which fields were indexed, and which
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* Analyzer was used on the text.
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* @lucene.experimental
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public interface FacetIndexingParams extends Serializable {
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* The name of the category-list to put this category in, or null if this
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* category should not be aggregatable.
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* By default, all categories are written to the same category list, but
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* applications which know in advance that in some situations only parts
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* of the category hierarchy needs to be counted can divide the categories
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* into two or more different category lists.
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* If null is returned for a category, it means that this category should
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* not appear in any category list, and thus counts for it cannot be
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* aggregated. This category can still be used for drill-down, even though
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* the count for it is not known.
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public CategoryListParams getCategoryListParams(CategoryPath category);
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* Return info about all category lists in the index.
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* @see #getCategoryListParams(CategoryPath)
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public Iterable<CategoryListParams> getAllCategoryListParams();
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// TODO (Facet): Add special cases of exact/non-exact category term-text
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* Return the drilldown Term-Text which does not need to do any allocations.
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* The number of chars set is returned.
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* Note: Make sure <code>buffer</code> is large enough.
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* @see CategoryPath#charsNeededForFullPath()
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public int drillDownTermText(CategoryPath path, char[] buffer);
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* Get the partition size.
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* Same value should be used during the life time of an index.
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* At search time this value is compared with actual taxonomy size and their minimum is used.
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public int getPartitionSize();
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* Get the policy for indexing category <b>paths</b>,
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* used for deciding how "high" to climb in taxonomy
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* from a category when ingesting its category paths.
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public PathPolicy getPathPolicy();
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* Get the policy for indexing category <b>ordinals</b>,
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* used for deciding how "high" to climb in taxonomy
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* from a category when ingesting its ordinals
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public OrdinalPolicy getOrdinalPolicy();
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* Get the delimiter character used internally for drill-down terms
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public char getFacetDelimChar();