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 * 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
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package org.apache.lucene.queries.function.valuesource;

import org.apache.lucene.index.LeafReaderContext;
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;

RangeMapFloatFunction implements a map function over another ValueSource whose values fall within min and max inclusive to target.
Normally Used as an argument to a FunctionQuery
/** * <code>RangeMapFloatFunction</code> implements a map function over * another {@link ValueSource} whose values fall within min and max inclusive to target. * <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 ValueSource target; protected final ValueSource defaultVal; public RangeMapFloatFunction(ValueSource source, float min, float max, float target, Float def) { this(source, min, max, new ConstValueSource(target), def == null ? null : new ConstValueSource(def)); } public RangeMapFloatFunction(ValueSource source, float min, float max, ValueSource target, ValueSource 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.description() + "," + (defaultVal == null ? "null" : defaultVal.description()) + ")"; } @Override public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { final FunctionValues vals = source.getValues(context, readerContext); final FunctionValues targets = target.getValues(context, readerContext); final FunctionValues defaults = (this.defaultVal == null) ? null : defaultVal.getValues(context, readerContext); return new FloatDocValues(this) { @Override public float floatVal(int doc) throws IOException { float val = vals.floatVal(doc); return (val>=min && val<=max) ? targets.floatVal(doc) : (defaultVal == null ? val : defaults.floatVal(doc)); } @Override public String toString(int doc) throws IOException { return "map(" + vals.toString(doc) + ",min=" + min + ",max=" + max + ",target=" + targets.toString(doc) + ",defaultVal=" + (defaults == null ? "null" : (defaults.toString(doc))) + ")"; } }; } @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 += target.hashCode(); 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.equals(other.target) && this.source.equals(other.source) && (this.defaultVal == other.defaultVal || (this.defaultVal != null && this.defaultVal.equals(other.defaultVal))); } }