package org.apache.lucene.queries.function.valuesource;
/*
* 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.AtomicReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.IndexSearcher;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
* Converts individual ValueSource instances to leverage the FunctionValues *Val functions that work with multiple values,
* i.e. {@link org.apache.lucene.queries.function.FunctionValues#doubleVal(int, double[])}
*/
//Not crazy about the name, but...
public class VectorValueSource extends MultiValueSource {
protected final List<ValueSource> sources;
public VectorValueSource(List<ValueSource> sources) {
this.sources = sources;
}
public List<ValueSource> getSources() {
return sources;
}
@Override
public int dimension() {
return sources.size();
}
public String name() {
return "vector";
}
@Override
public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
int size = sources.size();
// special-case x,y and lat,lon since it's so common
if (size==2) {
final FunctionValues x = sources.get(0).getValues(context, readerContext);
final FunctionValues y = sources.get(1).getValues(context, readerContext);
return new FunctionValues() {
@Override
public void byteVal(int doc, byte[] vals) {
vals[0] = x.byteVal(doc);
vals[1] = y.byteVal(doc);
}
@Override
public void shortVal(int doc, short[] vals) {
vals[0] = x.shortVal(doc);
vals[1] = y.shortVal(doc);
}
@Override
public void intVal(int doc, int[] vals) {
vals[0] = x.intVal(doc);
vals[1] = y.intVal(doc);
}
@Override
public void longVal(int doc, long[] vals) {
vals[0] = x.longVal(doc);
vals[1] = y.longVal(doc);
}
@Override
public void floatVal(int doc, float[] vals) {
vals[0] = x.floatVal(doc);
vals[1] = y.floatVal(doc);
}
@Override
public void doubleVal(int doc, double[] vals) {
vals[0] = x.doubleVal(doc);
vals[1] = y.doubleVal(doc);
}
@Override
public void strVal(int doc, String[] vals) {
vals[0] = x.strVal(doc);
vals[1] = y.strVal(doc);
}
@Override
public String toString(int doc) {
return name() + "(" + x.toString(doc) + "," + y.toString(doc) + ")";
}
};
}
final FunctionValues[] valsArr = new FunctionValues[size];
for (int i = 0; i < size; i++) {
valsArr[i] = sources.get(i).getValues(context, readerContext);
}
return new FunctionValues() {
@Override
public void byteVal(int doc, byte[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].byteVal(doc);
}
}
@Override
public void shortVal(int doc, short[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].shortVal(doc);
}
}
@Override
public void floatVal(int doc, float[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].floatVal(doc);
}
}
@Override
public void intVal(int doc, int[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].intVal(doc);
}
}
@Override
public void longVal(int doc, long[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].longVal(doc);
}
}
@Override
public void doubleVal(int doc, double[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].doubleVal(doc);
}
}
@Override
public void strVal(int doc, String[] vals) {
for (int i = 0; i < valsArr.length; i++) {
vals[i] = valsArr[i].strVal(doc);
}
}
@Override
public String toString(int doc) {
StringBuilder sb = new StringBuilder();
sb.append(name()).append('(');
boolean firstTime = true;
for (FunctionValues 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, IndexSearcher searcher) throws IOException {
for (ValueSource source : sources)
source.createWeight(context, searcher);
}
@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 boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof VectorValueSource)) return false;
VectorValueSource that = (VectorValueSource) o;
return sources.equals(that.sources);
}
@Override
public int hashCode() {
return sources.hashCode();
}
}