| package org.apache.lucene.facet.taxonomy.writercache.cl2o; |
| |
| import org.apache.lucene.facet.taxonomy.CategoryPath; |
| |
| /* |
| * 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. |
| */ |
| |
| /** Utilities for use of {@link CategoryPath} by {@link CompactLabelToOrdinal}. */ |
| class CategoryPathUtils { |
| |
| /** Serializes the given {@link CategoryPath} to the {@link CharBlockArray}. */ |
| public static void serialize(CategoryPath cp, CharBlockArray charBlockArray) { |
| charBlockArray.append((char) cp.length); |
| if (cp.length == 0) { |
| return; |
| } |
| for (int i = 0; i < cp.length; i++) { |
| charBlockArray.append((char) cp.components[i].length()); |
| charBlockArray.append(cp.components[i]); |
| } |
| } |
| |
| /** |
| * Calculates a hash function of a path that was serialized with |
| * {@link #serialize(CategoryPath, CharBlockArray)}. |
| */ |
| public static int hashCodeOfSerialized(CharBlockArray charBlockArray, int offset) { |
| int length = (short) charBlockArray.charAt(offset++); |
| if (length == 0) { |
| return 0; |
| } |
| |
| int hash = length; |
| for (int i = 0; i < length; i++) { |
| int len = (short) charBlockArray.charAt(offset++); |
| hash = hash * 31 + charBlockArray.subSequence(offset, offset + len).hashCode(); |
| offset += len; |
| } |
| return hash; |
| } |
| |
| /** |
| * Check whether the {@link CategoryPath} is equal to the one serialized in |
| * {@link CharBlockArray}. |
| */ |
| public static boolean equalsToSerialized(CategoryPath cp, CharBlockArray charBlockArray, int offset) { |
| int n = charBlockArray.charAt(offset++); |
| if (cp.length != n) { |
| return false; |
| } |
| if (cp.length == 0) { |
| return true; |
| } |
| |
| for (int i = 0; i < cp.length; i++) { |
| int len = (short) charBlockArray.charAt(offset++); |
| if (len != cp.components[i].length()) { |
| return false; |
| } |
| if (!cp.components[i].equals(charBlockArray.subSequence(offset, offset + len))) { |
| return false; |
| } |
| offset += len; |
| } |
| return true; |
| } |
| |
| } |