/**
* 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;
public abstract class DualFloatFunction extends ValueSource {
protected final ValueSource a;
protected final ValueSource b;
/**
* @param a the base.
* @param b the exponent.
*/
public DualFloatFunction(ValueSource a, ValueSource b) {
this.a = a;
this.b = b;
}
protected abstract String name();
protected abstract float func(int doc, DocValues aVals, DocValues bVals);
public String description() {
return name() + "(" + a.description() + "," + b.description() + ")";
}
public DocValues getValues(Map context, IndexReader reader) throws IOException {
final DocValues aVals = a.getValues(context, reader);
final DocValues bVals = b.getValues(context, reader);
return new DocValues() {
public float floatVal(int doc) {
return func(doc, aVals, bVals);
}
public int intVal(int doc) {
return (int)floatVal(doc);
}
public long longVal(int doc) {
return (long)floatVal(doc);
}
public double doubleVal(int doc) {
return floatVal(doc);
}
public String strVal(int doc) {
return Float.toString(floatVal(doc));
}
public String toString(int doc) {
return name() + '(' + aVals.toString(doc) + ',' + bVals.toString(doc) + ')';
}
};
}
@Override
public void createWeight(Map context, Searcher searcher) throws IOException {
a.createWeight(context,searcher);
b.createWeight(context,searcher);
}
public int hashCode() {
int h = a.hashCode();
h ^= (h << 13) | (h >>> 20);
h += b.hashCode();
h ^= (h << 23) | (h >>> 10);
h += name().hashCode();
return h;
}
public boolean equals(Object o) {
if (this.getClass() != o.getClass()) return false;
DualFloatFunction other = (DualFloatFunction)o;
return this.a.equals(other.a)
&& this.b.equals(other.b);
}
}