/*
* 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.analytics.util.valuesource;
import java.io.IOException;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.solr.search.QueryContext;
import org.apache.solr.search.function.FuncValues;
import org.apache.solr.search.function.ValueSource;
import org.apache.solr.search.function.funcvalues.DoubleFuncValues;
/**
* Abstract {@link ValueSource} implementation which wraps two ValueSources
* and applies an extendible double function to their values.
**/
public abstract class DualDoubleFunction extends ValueSource {
protected final ValueSource a;
protected final ValueSource b;
public DualDoubleFunction(ValueSource a, ValueSource b) {
this.a = a;
this.b = b;
}
protected abstract String name();
protected abstract double func(int doc, FuncValues aVals, FuncValues bVals);
@Override
public String description() {
return name() + "(" + a.description() + "," + b.description() + ")";
}
@Override
public FuncValues getValues(QueryContext context, AtomicReaderContext readerContext) throws IOException {
final FuncValues aVals = a.getValues(context, readerContext);
final FuncValues bVals = b.getValues(context, readerContext);
return new DoubleFuncValues(this) {
@Override
public double doubleVal(int doc) {
return func(doc, aVals, bVals);
}
@Override
public boolean exists(int doc) {
return aVals.exists(doc) & bVals.exists(doc);
}
@Override
public String toString(int doc) {
return name() + '(' + aVals.toString(doc) + ',' + bVals.toString(doc) + ')';
}
};
}
@Override
public void createWeight(QueryContext context) throws IOException {
a.createWeight(context);
b.createWeight(context);
}
@Override
public boolean equals(Object o) {
if (getClass() != o.getClass()) return false;
DualDoubleFunction other = (DualDoubleFunction)o;
return this.a.equals(other.a)
&& this.b.equals(other.b);
}
@Override
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;
}
}