/*
* 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.solr.client.solrj.io.eval;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import java.util.Locale;
import org.apache.solr.client.solrj.io.Tuple;
import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
public class RoundEvaluator extends NumberEvaluator {
protected static final long serialVersionUID = 1L;
public RoundEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
super(expression, factory);
if(1 != subEvaluators.size()){
throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting one value but found %d",expression,subEvaluators.size()));
}
}
@Override
public Number evaluate(Tuple tuple) throws IOException {
List<BigDecimal> results = evaluateAll(tuple);
// we're still doing these checks because if we ever add an array-flatten evaluator,
// one found in the constructor could become != 1
if(1 != results.size()){
throw new IOException(String.format(Locale.ROOT,"%s(...) only works with a 1 value but %d were provided", constructingFactory.getFunctionName(getClass()), results.size()));
}
if(null == results.get(0)){
return null;
}
return Math.round(results.get(0).doubleValue());
}
}