/*
* 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.lucene.queries.function.valuesource;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.FloatDocValues;
import org.apache.lucene.search.IndexSearcher;
import java.io.IOException;
import java.util.Map;
/**
* <code>LinearFloatFunction</code> implements a linear function over
* another {@link org.apache.lucene.queries.function.ValueSource}.
* <br>
* Normally Used as an argument to a {@link org.apache.lucene.queries.function.FunctionQuery}
*
*
*/
public class RangeMapFloatFunction extends ValueSource {
protected final ValueSource source;
protected final float min;
protected final float max;
protected final float target;
protected final Float defaultVal;
public RangeMapFloatFunction(ValueSource source, float min, float max, float target, Float def) {
this.source = source;
this.min = min;
this.max = max;
this.target = target;
this.defaultVal = def;
}
@Override
public String description() {
return "map(" + source.description() + "," + min + "," + max + "," + target + ")";
}
@Override
public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
final FunctionValues vals = source.getValues(context, readerContext);
return new FloatDocValues(this) {
@Override
public float floatVal(int doc) {
float val = vals.floatVal(doc);
return (val>=min && val<=max) ? target : (defaultVal == null ? val : defaultVal);
}
@Override
public String toString(int doc) {
return "map(" + vals.toString(doc) + ",min=" + min + ",max=" + max + ",target=" + target + ")";
}
};
}
@Override
public void createWeight(Map context, IndexSearcher searcher) throws IOException {
source.createWeight(context, searcher);
}
@Override
public int hashCode() {
int h = source.hashCode();
h ^= (h << 10) | (h >>> 23);
h += Float.floatToIntBits(min);
h ^= (h << 14) | (h >>> 19);
h += Float.floatToIntBits(max);
h ^= (h << 13) | (h >>> 20);
h += Float.floatToIntBits(target);
if (defaultVal != null)
h += defaultVal.hashCode();
return h;
}
@Override
public boolean equals(Object o) {
if (RangeMapFloatFunction.class != o.getClass()) return false;
RangeMapFloatFunction other = (RangeMapFloatFunction)o;
return this.min == other.min
&& this.max == other.max
&& this.target == other.target
&& this.source.equals(other.source)
&& (this.defaultVal == other.defaultVal || (this.defaultVal != null && this.defaultVal.equals(other.defaultVal)));
}
}