/*
* 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.
*/
package org.apache.lucene.spatial.util;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.FilteredDocIdSet;
import org.apache.lucene.util.Bits;
import java.io.IOException;
/**
* Filter that matches all documents where a ValueSource is
* in between a range of <code>min</code> and <code>max</code> inclusive.
* @lucene.internal
*/
public class ValueSourceFilter extends Filter {
//TODO see https://issues.apache.org/jira/browse/LUCENE-4251 (move out of spatial & improve)
final Filter startingFilter;
final ValueSource source;
final double min;
final double max;
public ValueSourceFilter( Filter startingFilter, ValueSource source, double min, double max )
{
if (startingFilter == null) {
throw new IllegalArgumentException("please provide a non-null startingFilter; you can use QueryWrapperFilter(MatchAllDocsQuery) as a no-op filter");
}
this.startingFilter = startingFilter;
this.source = source;
this.min = min;
this.max = max;
}
@Override
public DocIdSet getDocIdSet(AtomicReaderContext context, Bits acceptDocs) throws IOException {
final FunctionValues values = source.getValues( null, context );
return new FilteredDocIdSet(startingFilter.getDocIdSet(context, acceptDocs)) {
@Override
public boolean match(int doc) {
double val = values.doubleVal( doc );
return val >= min && val <= max;
}
};
}
}