1 package org.apache.lucene.facet.taxonomy.directory;
3 import org.apache.lucene.document.FieldSelector;
4 import org.apache.lucene.document.FieldSelectorResult;
7 * Licensed to the Apache Software Foundation (ASF) under one or more
8 * contributor license agreements. See the NOTICE file distributed with
9 * this work for additional information regarding copyright ownership.
10 * The ASF licenses this file to You under the Apache License, Version 2.0
11 * (the "License"); you may not use this file except in compliance with
12 * the License. You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS,
18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
24 * @lucene.experimental
26 abstract class Consts {
28 static final String FULL = "$full_path$";
29 static final String FIELD_PAYLOADS = "$payloads$";
30 static final String PAYLOAD_PARENT = "p";
31 static final char[] PAYLOAD_PARENT_CHARS = PAYLOAD_PARENT.toCharArray();
34 * The following is a "field selector", an object which tells Lucene to
35 * extract only a single field rather than a whole document.
37 public static final FieldSelector fullPathSelector = new FieldSelector() {
38 public FieldSelectorResult accept(String fieldName) {
39 if (fieldName.equals(FULL)) {
40 return FieldSelectorResult.LOAD_AND_BREAK;
42 return FieldSelectorResult.NO_LOAD;
47 * Delimiter used for creating the full path of a category from the list of
48 * its labels from root. It is forbidden for labels to contain this
51 * Originally, we used \uFFFE, officially a "unicode noncharacter" (invalid
52 * unicode character) for this purpose. Recently, we switched to the
53 * "private-use" character \uF749.
55 //static final char DEFAULT_DELIMITER = '\uFFFE';
56 static final char DEFAULT_DELIMITER = '\uF749';