org.apache.solr.search.function.MaxFloatFunction 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.solr.search.function;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Searcher;
import java.io.IOException;
import java.util.Map;
/**
* Returns the max of a ValueSource and a float
* (which is useful for "bottoming out" another function at 0.0,
* or some positive number).
*
* Normally Used as an argument to a {@link FunctionQuery}
*
* @version $Id: MaxFloatFunction.java 816202 2009-09-17 14:08:13Z yonik $
*/
public class MaxFloatFunction extends ValueSource {
protected final ValueSource source;
protected final float fval;
public MaxFloatFunction(ValueSource source, float fval) {
this.source = source;
this.fval = fval;
}
public String description() {
return "max(" + source.description() + "," + fval + ")";
}
public DocValues getValues(Map context, IndexReader reader) throws IOException {
final DocValues vals = source.getValues(context, reader);
return new DocValues() {
public float floatVal(int doc) {
float v = vals.floatVal(doc);
return v < fval ? fval : v;
}
public int intVal(int doc) {
return (int)floatVal(doc);
}
public long longVal(int doc) {
return (long)floatVal(doc);
}
public double doubleVal(int doc) {
return (double)floatVal(doc);
}
public String strVal(int doc) {
return Float.toString(floatVal(doc));
}
public String toString(int doc) {
return "max(" + vals.toString(doc) + "," + fval + ")";
}
};
}
@Override
public void createWeight(Map context, Searcher searcher) throws IOException {
source.createWeight(context, searcher);
}
public int hashCode() {
int h = Float.floatToIntBits(fval);
h = (h >>> 2) | (h << 30);
return h + source.hashCode();
}
public boolean equals(Object o) {
if (MaxFloatFunction.class != o.getClass()) return false;
MaxFloatFunction other = (MaxFloatFunction)o;
return this.fval == other.fval
&& this.source.equals(other.source);
}
}