/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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 org.elasticsearch.common.lucene.docset.AllDocSet;
import org.elasticsearch.common.lucene.docset.DocSet;
import org.elasticsearch.common.lucene.docset.NotDocIdSet;
import org.elasticsearch.common.lucene.docset.NotDocSet;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public class NotFilter extends Filter {
private final Filter filter;
public NotFilter(Filter filter) {
this.filter = filter;
}
public Filter filter() {
return filter;
}
@Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
DocIdSet set = filter.getDocIdSet(reader);
if (set == null) {
return new AllDocSet(reader.maxDoc());
}
if (set instanceof DocSet) {
return new NotDocSet((DocSet) set, reader.maxDoc());
}
return new NotDocIdSet(set, reader.maxDoc());
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
NotFilter notFilter = (NotFilter) o;
return !(filter != null ? !filter.equals(notFilter.filter) : notFilter.filter != null);
}
@Override
public int hashCode() {
return filter != null ? filter.hashCode() : 0;
}
}