| /* |
| * 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.queryparser.surround.query; |
| import java.util.List; |
| import java.util.Iterator; |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.search.MatchNoDocsQuery; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.spans.SpanNearQuery; |
| import org.apache.lucene.search.spans.SpanQuery; |
| |
| /** Factory for NEAR queries */ |
| public class DistanceQuery extends ComposedQuery implements DistanceSubQuery { |
| public DistanceQuery( |
| List<SrndQuery> queries, |
| boolean infix, |
| int opDistance, |
| String opName, |
| boolean ordered) { |
| super(queries, infix, opName); |
| this.opDistance = opDistance; /* the distance indicated in the operator */ |
| this.ordered = ordered; |
| } |
| |
| |
| private int opDistance; |
| public int getOpDistance() {return opDistance;} |
| |
| private boolean ordered; |
| public boolean subQueriesOrdered() {return ordered;} |
| |
| @Override |
| public String distanceSubQueryNotAllowed() { |
| Iterator<?> sqi = getSubQueriesIterator(); |
| while (sqi.hasNext()) { |
| Object leq = sqi.next(); |
| if (leq instanceof DistanceSubQuery) { |
| DistanceSubQuery dsq = (DistanceSubQuery) leq; |
| String m = dsq.distanceSubQueryNotAllowed(); |
| if (m != null) { |
| return m; |
| } |
| } else { |
| return "Operator " + getOperatorName() + " does not allow subquery " + leq.toString(); |
| } |
| } |
| return null; /* subqueries acceptable */ |
| } |
| |
| @Override |
| public void addSpanQueries(SpanNearClauseFactory sncf) throws IOException { |
| Query snq = getSpanNearQuery(sncf.getIndexReader(), |
| sncf.getFieldName(), |
| sncf.getBasicQueryFactory()); |
| sncf.addSpanQuery(snq); |
| } |
| |
| public Query getSpanNearQuery( |
| IndexReader reader, |
| String fieldName, |
| BasicQueryFactory qf) throws IOException { |
| SpanQuery[] spanClauses = new SpanQuery[getNrSubQueries()]; |
| Iterator<?> sqi = getSubQueriesIterator(); |
| int qi = 0; |
| while (sqi.hasNext()) { |
| SpanNearClauseFactory sncf = new SpanNearClauseFactory(reader, fieldName, qf); |
| |
| ((DistanceSubQuery)sqi.next()).addSpanQueries(sncf); |
| if (sncf.size() == 0) { /* distance operator requires all sub queries */ |
| while (sqi.hasNext()) { /* produce evt. error messages but ignore results */ |
| ((DistanceSubQuery)sqi.next()).addSpanQueries(sncf); |
| sncf.clear(); |
| } |
| return new MatchNoDocsQuery(); |
| } |
| |
| spanClauses[qi] = sncf.makeSpanClause(); |
| qi++; |
| } |
| |
| return new SpanNearQuery(spanClauses, getOpDistance() - 1, subQueriesOrdered()); |
| } |
| |
| @Override |
| public Query makeLuceneQueryFieldNoBoost(final String fieldName, final BasicQueryFactory qf) { |
| return new DistanceRewriteQuery(this, fieldName, qf); |
| } |
| } |
| |