org.apache.lucene.queries.function.valuesource.SimpleFloatFunction 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.LeafReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.FloatDocValues;
/** A simple float function with a single argument */
public abstract class SimpleFloatFunction extends SingleFunction {
public SimpleFloatFunction(ValueSource source) {
super(source);
}
protected abstract float func(int doc, FunctionValues vals) throws IOException;
@Override
public FunctionValues getValues(Map context, LeafReaderContext readerContext)
throws IOException {
final FunctionValues vals = source.getValues(context, readerContext);
return new FloatDocValues(this) {
@Override
public float floatVal(int doc) throws IOException {
return func(doc, vals);
}
@Override
public String toString(int doc) throws IOException {
return name() + '(' + vals.toString(doc) + ')';
}
};
}
}