org.elasticsearch.common.lucene.search.MatchNoDocsFilter Maven / Gradle / Ivy

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/*
 * Licensed to ElasticSearch and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. ElasticSearch 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.
 */

package org.elasticsearch.common.lucene.search;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;

import java.io.IOException;

/**
 * A filter that matches no docs.
 */
public class MatchNoDocsFilter extends Filter {

    @Override
    public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
        return null;
    }

    @Override
    public int hashCode() {
        return this.getClass().hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;

        if (obj == null) {
            return false;
        }

        if (obj.getClass() == this.getClass()) {
            return true;
        }

        return false;
    }

    @Override
    public String toString() {
        return "MatchNoDocsFilter";
    }
}