1 package org.apache.lucene.search;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
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20 import java.io.IOException;
23 import org.apache.lucene.index.IndexReader;
26 * Constrains search results to only match those which also match a provided
29 * <p> This could be used, for example, with a {@link TermRangeQuery} on a suitably
30 * formatted date field to implement date filtering. One could re-use a single
31 * QueryFilter that matches, e.g., only documents modified within the last
32 * week. The QueryFilter and TermRangeQuery would only need to be reconstructed
35 public class QueryWrapperFilter extends Filter {
38 /** Constructs a filter which only matches documents matching
41 public QueryWrapperFilter(Query query) {
46 public DocIdSet getDocIdSet(final IndexReader reader) throws IOException {
47 final Weight weight = new IndexSearcher(reader).createNormalizedWeight(query);
48 return new DocIdSet() {
50 public DocIdSetIterator iterator() throws IOException {
51 return weight.scorer(reader, true, false);
54 public boolean isCacheable() { return false; }
59 public String toString() {
60 return "QueryWrapperFilter(" + query + ")";
64 public boolean equals(Object o) {
65 if (!(o instanceof QueryWrapperFilter))
67 return this.query.equals(((QueryWrapperFilter)o).query);
71 public int hashCode() {
72 return query.hashCode() ^ 0x923F64B9;