package org.apache.solr.search.function;
/**
* 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.
*/
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Searcher;
import java.util.Map;
import java.util.Arrays;
import java.io.IOException;
/**
*
*
**/ // a simple function of multiple sources
public abstract class MultiFloatFunction extends ValueSource {
protected final ValueSource[] sources;
public MultiFloatFunction(ValueSource[] sources) {
this.sources = sources;
}
abstract protected String name();
abstract protected float func(int doc, DocValues[] valsArr);
@Override
public String description() {
StringBuilder sb = new StringBuilder();
sb.append(name()).append('(');
boolean firstTime=true;
for (ValueSource source : sources) {
if (firstTime) {
firstTime=false;
} else {
sb.append(',');
}
sb.append(source);
}
sb.append(')');
return sb.toString();
}
@Override
public DocValues getValues(Map context, IndexReader reader) throws IOException {
final DocValues[] valsArr = new DocValues[sources.length];
for (int i=0; i<sources.length; i++) {
valsArr[i] = sources[i].getValues(context, reader);
}
return new DocValues() {
@Override
public float floatVal(int doc) {
return func(doc, valsArr);
}
@Override
public int intVal(int doc) {
return (int)floatVal(doc);
}
@Override
public long longVal(int doc) {
return (long)floatVal(doc);
}
@Override
public double doubleVal(int doc) {
return (double)floatVal(doc);
}
@Override
public String strVal(int doc) {
return Float.toString(floatVal(doc));
}
@Override
public String toString(int doc) {
StringBuilder sb = new StringBuilder();
sb.append(name()).append('(');
boolean firstTime=true;
for (DocValues vals : valsArr) {
if (firstTime) {
firstTime=false;
} else {
sb.append(',');
}
sb.append(vals.toString(doc));
}
sb.append(')');
return sb.toString();
}
};
}
@Override
public void createWeight(Map context, Searcher searcher) throws IOException {
for (ValueSource source : sources)
source.createWeight(context, searcher);
}
@Override
public int hashCode() {
return Arrays.hashCode(sources) + name().hashCode();
}
@Override
public boolean equals(Object o) {
if (this.getClass() != o.getClass()) return false;
MultiFloatFunction other = (MultiFloatFunction)o;
return this.name().equals(other.name())
&& Arrays.equals(this.sources, other.sources);
}
}