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;
/** A scorer that matches no document at all. */
class NonMatchingScorer extends Scorer {
public NonMatchingScorer() { super(null); } // no similarity used
public int doc() { throw new UnsupportedOperationException(); }
public boolean next() throws IOException { return false; }
public float score() { throw new UnsupportedOperationException(); }
public boolean skipTo(int target) { return false; }
public Explanation explain(int doc) {
Explanation e = new Explanation();
e.setDescription("No document matches.");
return e;
}
}
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