X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/QueryWrapperFilter.java diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/QueryWrapperFilter.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/QueryWrapperFilter.java new file mode 100644 index 0000000..0c78c64 --- /dev/null +++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/QueryWrapperFilter.java @@ -0,0 +1,74 @@ +package 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 java.io.IOException; + + +import org.apache.lucene.index.IndexReader; + +/** + * Constrains search results to only match those which also match a provided + * query. + * + *
This could be used, for example, with a {@link TermRangeQuery} on a suitably
+ * formatted date field to implement date filtering. One could re-use a single
+ * QueryFilter that matches, e.g., only documents modified within the last
+ * week. The QueryFilter and TermRangeQuery would only need to be reconstructed
+ * once per day.
+ */
+public class QueryWrapperFilter extends Filter {
+ private Query query;
+
+ /** Constructs a filter which only matches documents matching
+ * query
.
+ */
+ public QueryWrapperFilter(Query query) {
+ this.query = query;
+ }
+
+ @Override
+ public DocIdSet getDocIdSet(final IndexReader reader) throws IOException {
+ final Weight weight = new IndexSearcher(reader).createNormalizedWeight(query);
+ return new DocIdSet() {
+ @Override
+ public DocIdSetIterator iterator() throws IOException {
+ return weight.scorer(reader, true, false);
+ }
+ @Override
+ public boolean isCacheable() { return false; }
+ };
+ }
+
+ @Override
+ public String toString() {
+ return "QueryWrapperFilter(" + query + ")";
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (!(o instanceof QueryWrapperFilter))
+ return false;
+ return this.query.equals(((QueryWrapperFilter)o).query);
+ }
+
+ @Override
+ public int hashCode() {
+ return query.hashCode() ^ 0x923F64B9;
+ }
+}