| /* |
| * 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.math.MathContext; |
| import java.util.Locale; |
| |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| public class ModuloEvaluator extends RecursiveNumericEvaluator implements TwoValueWorker { |
| protected static final long serialVersionUID = 1L; |
| |
| public ModuloEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{ |
| super(expression, factory); |
| |
| if(2 != containedEvaluators.size()){ |
| throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting two values but found %d",expression, containedEvaluators.size())); |
| } |
| } |
| |
| // override to give a slightly better error message than the default |
| @Override |
| public Object doWork(Object ... values) throws IOException{ |
| if(2 != values.length){ |
| String message = null; |
| if(1 == values.length){ |
| message = String.format(Locale.ROOT,"%s(...) only works with a 2 values (numerator,denominator) but 1 was provided", constructingFactory.getFunctionName(getClass())); |
| } |
| else{ |
| message = String.format(Locale.ROOT,"%s(...) only works with a 2 values (numerator,denominator) but %d were provided", constructingFactory.getFunctionName(getClass()), values.length); |
| } |
| throw new IOException(message); |
| } |
| |
| return doWork(values[0], values[1]); |
| } |
| |
| |
| @Override |
| public Object doWork(Object first, Object second) throws IOException{ |
| if(null == first){ |
| throw new IOException(String.format(Locale.ROOT,"Unable to %s(...) with a null numerator", constructingFactory.getFunctionName(getClass()))); |
| } |
| |
| if(null == second){ |
| throw new IOException(String.format(Locale.ROOT,"Unable to %s(...) with a null denominator", constructingFactory.getFunctionName(getClass()))); |
| } |
| |
| BigDecimal numerator = (BigDecimal)first; |
| BigDecimal denominator = (BigDecimal)second; |
| |
| if(0 == denominator.compareTo(BigDecimal.ZERO)){ |
| throw new IOException(String.format(Locale.ROOT,"Unable to %s(...) with a 0 denominator", constructingFactory.getFunctionName(getClass()))); |
| } |
| |
| return numerator.remainder(denominator, MathContext.DECIMAL64); |
| } |
| } |