NonMatchingScorer


1   package org.apache.lucene.search;
2   
3   /**
4    * Copyright 2005 Apache Software Foundation
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18   
19  import java.io.IOException  ;
20  
21  /** A scorer that matches no document at all. */
22  class NonMatchingScorer extends Scorer {
23    public NonMatchingScorer() { super(null); } // no similarity used
24    
25    public int doc() { throw new UnsupportedOperationException  (); }
26  
27    public boolean next() throws IOException   { return false; }
28  
29    public float score() { throw new UnsupportedOperationException  (); }
30  
31    public boolean skipTo(int target) { return false; }
32  
33    public Explanation explain(int doc) {
34      Explanation e = new Explanation();
35      e.setDescription("No document matches.");
36      return e;
37    }
38  }
39   
40  
41

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