| /* |
| * 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.util.Map; |
| import java.util.Arrays; |
| import java.io.IOException; |
| |
| |
| /** |
| * Abstract {@link ValueSource} implementation which wraps multiple ValueSources |
| * and applies an extendible float function to their values. |
| **/ |
| 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, FunctionValues[] valsArr) throws IOException; |
| /** |
| * Called by {@link FunctionValues#exists} for each document. |
| * |
| * Default impl returns true if <em>all</em> of the specified <code>values</code> |
| * {@link FunctionValues#exists} for the specified doc, else false. |
| * |
| * @see FunctionValues#exists |
| * @see MultiFunction#allExists |
| */ |
| protected boolean exists(int doc, FunctionValues[] valsArr) throws IOException { |
| return MultiFunction.allExists(doc, 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 FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| final FunctionValues[] valsArr = new FunctionValues[sources.length]; |
| for (int i=0; i<sources.length; i++) { |
| valsArr[i] = sources[i].getValues(context, readerContext); |
| } |
| |
| return new FloatDocValues(this) { |
| @Override |
| public float floatVal(int doc) throws IOException { |
| return func(doc, valsArr); |
| } |
| public boolean exists(int doc) throws IOException { |
| return MultiFloatFunction.this.exists(doc, valsArr); |
| } |
| @Override |
| public String toString(int doc) throws IOException { |
| return MultiFunction.toString(name(), valsArr, doc); |
| } |
| }; |
| } |
| |
| @Override |
| public void createWeight(Map context, IndexSearcher 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); |
| } |
| } |