Java tutorial
/* * 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. */ package org.apache.lucene.search.spans; import java.io.IOException; import java.util.Collection; import java.util.Map; import java.util.TreeMap; import org.apache.lucene.index.Term; import org.apache.lucene.index.TermStates; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreMode; /** Base class for span-based queries. */ public abstract class SpanQuery extends Query { /** * Returns the name of the field matched by this query. */ public abstract String getField(); @Override public abstract SpanWeight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException; /** * Build a map of terms to {@link TermStates}, for use in constructing SpanWeights * @lucene.internal */ public static Map<Term, TermStates> getTermStates(SpanWeight... weights) { Map<Term, TermStates> terms = new TreeMap<>(); for (SpanWeight w : weights) { w.extractTermStates(terms); } return terms; } /** * Build a map of terms to {@link TermStates}, for use in constructing SpanWeights * @lucene.internal */ public static Map<Term, TermStates> getTermStates(Collection<SpanWeight> weights) { Map<Term, TermStates> terms = new TreeMap<>(); for (SpanWeight w : weights) { w.extractTermStates(terms); } return terms; } }