| package org.apache.lucene.facet.taxonomy; |
| |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * Returns 3 arrays for traversing the taxonomy: |
| * <ul> |
| * <li>{@code parents}: {@code parents[i]} denotes the parent of category |
| * ordinal {@code i}.</li> |
| * <li>{@code children}: {@code children[i]} denotes a child of category ordinal |
| * {@code i}.</li> |
| * <li>{@code siblings}: {@code siblings[i]} denotes the sibling of category |
| * ordinal {@code i}.</li> |
| * </ul> |
| * |
| * To traverse the taxonomy tree, you typically start with {@code children[0]} |
| * (ordinal 0 is reserved for ROOT), and then depends if you want to do DFS or |
| * BFS, you call {@code children[children[0]]} or {@code siblings[children[0]]} |
| * and so forth, respectively. |
| * |
| * <p> |
| * <b>NOTE:</b> you are not expected to modify the values of the arrays, since |
| * the arrays are shared with other threads. |
| * |
| * @lucene.experimental |
| */ |
| public abstract class ParallelTaxonomyArrays { |
| |
| /** Sole constructor. */ |
| public ParallelTaxonomyArrays() { |
| } |
| |
| /** |
| * Returns the parents array, where {@code parents[i]} denotes the parent of |
| * category ordinal {@code i}. |
| */ |
| public abstract int[] parents(); |
| |
| /** |
| * Returns the children array, where {@code children[i]} denotes a child of |
| * category ordinal {@code i}. |
| */ |
| public abstract int[] children(); |
| |
| /** |
| * Returns the siblings array, where {@code siblings[i]} denotes the sibling |
| * of category ordinal {@code i}. |
| */ |
| public abstract int[] siblings(); |
| |
| } |