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

import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.IndexSearcher;

import java.io.IOException;
import java.util.Map;

A function with a single argument
/** A function with a single argument */
public abstract class SingleFunction extends ValueSource { protected final ValueSource source; public SingleFunction(ValueSource source) { this.source = source; } protected abstract String name(); @Override public String description() { return name() + '(' + source.description() + ')'; } @Override public int hashCode() { return source.hashCode() + name().hashCode(); } @Override public boolean equals(Object o) { if (this.getClass() != o.getClass()) return false; SingleFunction other = (SingleFunction)o; return this.name().equals(other.name()) && this.source.equals(other.source); } @Override public void createWeight(Map context, IndexSearcher searcher) throws IOException { source.createWeight(context, searcher); } }