01: package org.apache.lucene.search;
02:
03: /**
04: * Licensed to the Apache Software Foundation (ASF) under one or more
05: * contributor license agreements. See the NOTICE file distributed with
06: * this work for additional information regarding copyright ownership.
07: * The ASF licenses this file to You under the Apache License, Version 2.0
08: * (the "License"); you may not use this file except in compliance with
09: * the License. You may obtain a copy of the License at
10: *
11: * http://www.apache.org/licenses/LICENSE-2.0
12: *
13: * Unless required by applicable law or agreed to in writing, software
14: * distributed under the License is distributed on an "AS IS" BASIS,
15: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16: * See the License for the specific language governing permissions and
17: * limitations under the License.
18: */
19:
20: import java.io.IOException;
21:
22: /** A scorer that matches no document at all. */
23: class NonMatchingScorer extends Scorer {
24: public NonMatchingScorer() {
25: super (null);
26: } // no similarity used
27:
28: public int doc() {
29: throw new UnsupportedOperationException();
30: }
31:
32: public boolean next() throws IOException {
33: return false;
34: }
35:
36: public float score() {
37: throw new UnsupportedOperationException();
38: }
39:
40: public boolean skipTo(int target) {
41: return false;
42: }
43:
44: public Explanation explain(int doc) {
45: Explanation e = new Explanation();
46: e.setDescription("No document matches.");
47: return e;
48: }
49: }
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