| /* |
| * 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.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; |
| |
| /** |
| * Abstract {@link ValueSource} implementation which wraps two ValueSources |
| * and applies an extendible float function to their values. |
| **/ |
| public abstract class DualFloatFunction extends ValueSource { |
| protected final ValueSource a; |
| protected final ValueSource b; |
| |
| /** |
| * @param a the base. |
| * @param b the exponent. |
| */ |
| public DualFloatFunction(ValueSource a, ValueSource b) { |
| this.a = a; |
| this.b = b; |
| } |
| |
| protected abstract String name(); |
| protected abstract float func(int doc, FunctionValues aVals, FunctionValues bVals) throws IOException; |
| |
| @Override |
| public String description() { |
| return name() + "(" + a.description() + "," + b.description() + ")"; |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| final FunctionValues aVals = a.getValues(context, readerContext); |
| final FunctionValues bVals = b.getValues(context, readerContext); |
| return new FloatDocValues(this) { |
| @Override |
| public float floatVal(int doc) throws IOException { |
| return func(doc, aVals, bVals); |
| } |
| /** |
| * True if and only if <em>all</em> of the wrapped {@link FunctionValues} |
| * <code>exists</code> for the specified doc |
| */ |
| @Override |
| public boolean exists(int doc) throws IOException { |
| return MultiFunction.allExists(doc, aVals, bVals); |
| } |
| @Override |
| public String toString(int doc) throws IOException { |
| return name() + '(' + aVals.toString(doc) + ',' + bVals.toString(doc) + ')'; |
| } |
| }; |
| } |
| |
| @Override |
| public void createWeight(Map context, IndexSearcher searcher) throws IOException { |
| a.createWeight(context,searcher); |
| b.createWeight(context,searcher); |
| } |
| |
| @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; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this.getClass() != o.getClass()) return false; |
| DualFloatFunction other = (DualFloatFunction)o; |
| return this.a.equals(other.a) |
| && this.b.equals(other.b); |
| } |
| } |