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Lucene example source code file (FieldDocSortedHitQueue.java)
The Lucene FieldDocSortedHitQueue.java source codepackage org.apache.lucene.search; /** * 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. */ import org.apache.lucene.util.PriorityQueue; import java.io.IOException; import java.text.Collator; import java.util.Locale; /** * Expert: Collects sorted results from Searchable's and collates them. * The elements put into this queue must be of type FieldDoc. * * <p>Created: Feb 11, 2004 2:04:21 PM * * @since lucene 1.4 */ class FieldDocSortedHitQueue extends PriorityQueue<FieldDoc> { volatile SortField[] fields = null; // used in the case where the fields are sorted by locale // based strings volatile Collator[] collators = null; volatile FieldComparator[] comparators = null; /** * Creates a hit queue sorted by the given list of fields. * @param fields Fieldable names, in priority order (highest priority first). * @param size The number of hits to retain. Must be greater than zero. */ FieldDocSortedHitQueue (int size) { initialize (size); } /** * Allows redefinition of sort fields if they are <code>null. * This is to handle the case using ParallelMultiSearcher where the * original list contains AUTO and we don't know the actual sort * type until the values come back. The fields can only be set once. * This method should be synchronized external like all other PQ methods. * @param fields */ void setFields (SortField[] fields) throws IOException { this.fields = fields; this.collators = hasCollators (fields); comparators = new FieldComparator[fields.length]; for(int fieldIDX=0;fieldIDX<fields.length;fieldIDX++) { comparators[fieldIDX] = fields[fieldIDX].getComparator(1, fieldIDX); } } /** Returns the fields being used to sort. */ SortField[] getFields() { return fields; } /** Returns an array of collators, possibly <code>null. The collators * correspond to any SortFields which were given a specific locale. * @param fields Array of sort fields. * @return Array, possibly <code>null. */ private Collator[] hasCollators (final SortField[] fields) { if (fields == null) return null; Collator[] ret = new Collator[fields.length]; for (int i=0; i<fields.length; ++i) { Locale locale = fields[i].getLocale(); if (locale != null) ret[i] = Collator.getInstance (locale); } return ret; } /** * Returns whether <code>a is less relevant than Other Lucene examples (source code examples)Here is a short list of links related to this Lucene FieldDocSortedHitQueue.java source code file: |
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