/* * Licensed to ElasticSearch and Shay Banon under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. ElasticSearch 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. */ package org.apache.lucene.search; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.Term; import org.apache.lucene.index.TermDocs; import org.apache.lucene.util.FixedBitSet; import java.io.IOException; import java.util.Arrays; /** * Similar to {@link TermsFilter} but stores the terms in an array for better memory usage * when cached, and also uses bulk read */ // LUCENE MONITOR: Against TermsFilter public class XTermsFilter extends Filter { public static final int BATCH_ENUM_DOCS = 32; private final Term[] terms; public XTermsFilter(Term term) { this.terms = new Term[]{term}; } public XTermsFilter(Term[] terms) { Arrays.sort(terms); this.terms = terms; } public Term[] getTerms() { return terms; } @Override public boolean equals(Object obj) { if (this == obj) return true; if ((obj == null) || (obj.getClass() != this.getClass())) return false; XTermsFilter test = (XTermsFilter) obj; return Arrays.equals(terms, test.terms); } @Override public int hashCode() { return Arrays.hashCode(terms); } @Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException { FixedBitSet result = null; TermDocs td = reader.termDocs(); try { // batch read, in Lucene 4.0 its no longer needed int[] docs = new int[BATCH_ENUM_DOCS]; int[] freqs = new int[BATCH_ENUM_DOCS]; for (Term term : terms) { td.seek(term); int number = td.read(docs, freqs); if (number > 0) { if (result == null) { result = new FixedBitSet(reader.maxDoc()); } while (number > 0) { for (int i = 0; i < number; i++) { result.set(docs[i]); } number = td.read(docs, freqs); } } } } finally { td.close(); } return result; } @Override public String toString() { StringBuilder builder = new StringBuilder(); for (Term term : terms) { if (builder.length() > 0) { builder.append(' '); } builder.append(term); } return builder.toString(); } }