org.apache.lucene.queries.function.valuesource.DoubleFieldSource Maven / Gradle / Ivy
/*
* 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.queries.function.valuesource;
import java.io.IOException;
import java.util.Map;
import org.apache.lucene.index.DocValues;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.docvalues.DoubleDocValues;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortField.Type;
/**
* Obtains double field values from {@link org.apache.lucene.index.LeafReader#getNumericDocValues}
* and makes those values available as other numeric types, casting as needed.
*/
public class DoubleFieldSource extends FieldCacheSource {
public DoubleFieldSource(String field) {
super(field);
}
@Override
public String description() {
return "double(" + field + ')';
}
@Override
public SortField getSortField(boolean reverse) {
return new SortField(field, Type.DOUBLE, reverse);
}
@Override
public FunctionValues getValues(Map context, LeafReaderContext readerContext)
throws IOException {
final NumericDocValues arr = getNumericDocValues(context, readerContext);
return new DoubleDocValues(this) {
int lastDocID;
@Override
public double doubleVal(int doc) throws IOException {
if (exists(doc)) {
return Double.longBitsToDouble(arr.longValue());
} else {
return 0.0;
}
}
@Override
public boolean exists(int doc) throws IOException {
if (doc < lastDocID) {
throw new IllegalArgumentException(
"docs were sent out-of-order: lastDocID=" + lastDocID + " vs docID=" + doc);
}
lastDocID = doc;
int curDocID = arr.docID();
if (doc > curDocID) {
curDocID = arr.advance(doc);
}
return doc == curDocID;
}
};
}
protected NumericDocValues getNumericDocValues(
Map context, LeafReaderContext readerContext) throws IOException {
return DocValues.getNumeric(readerContext.reader(), field);
}
@Override
public boolean equals(Object o) {
if (o.getClass() != DoubleFieldSource.class) return false;
DoubleFieldSource other = (DoubleFieldSource) o;
return super.equals(other);
}
@Override
public int hashCode() {
int h = Double.class.hashCode();
h += super.hashCode();
return h;
}
}