| /* |
| * 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.rya.api.function.aggregation; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static java.util.Objects.requireNonNull; |
| |
| import java.math.BigInteger; |
| |
| import org.apache.rya.api.model.VisibilityBindingSet; |
| import org.openrdf.model.Literal; |
| import org.openrdf.model.Value; |
| import org.openrdf.model.datatypes.XMLDatatypeUtil; |
| import org.openrdf.model.impl.IntegerLiteralImpl; |
| import org.openrdf.query.algebra.MathExpr.MathOp; |
| import org.openrdf.query.algebra.evaluation.ValueExprEvaluationException; |
| import org.openrdf.query.algebra.evaluation.util.MathUtil; |
| import org.openrdf.query.impl.MapBindingSet; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import edu.umd.cs.findbugs.annotations.DefaultAnnotation; |
| import edu.umd.cs.findbugs.annotations.NonNull; |
| |
| /** |
| * Add to the {@link AggregationState}'s sum if the child Binding Set contains the binding name |
| * that is being summed by the {@link AggregationElement}. |
| */ |
| @DefaultAnnotation(NonNull.class) |
| public final class SumFunction implements AggregationFunction { |
| private static final Logger log = LoggerFactory.getLogger(SumFunction.class); |
| |
| @Override |
| public void update(final AggregationElement aggregation, final AggregationState state, final VisibilityBindingSet childBindingSet) { |
| checkArgument(aggregation.getAggregationType() == AggregationType.SUM, "The SumFunction only accepts SUM AggregationElements."); |
| requireNonNull(state); |
| requireNonNull(childBindingSet); |
| |
| // Only add values to the sum if the child contains the binding that we are summing. |
| final String aggregatedName = aggregation.getAggregatedBindingName(); |
| if(childBindingSet.hasBinding(aggregatedName)) { |
| final MapBindingSet result = state.getBindingSet(); |
| final String resultName = aggregation.getResultBindingName(); |
| final boolean newBinding = !result.hasBinding(resultName); |
| |
| // Get the starting number for the sum. |
| Literal sum; |
| if(newBinding) { |
| sum = new IntegerLiteralImpl(BigInteger.ZERO); |
| } else { |
| sum = (Literal) state.getBindingSet().getValue(resultName); |
| } |
| |
| // Add the child binding set's value if it is a numeric literal. |
| final Value childValue = childBindingSet.getValue(aggregatedName); |
| if(childValue instanceof Literal) { |
| final Literal childLiteral = (Literal) childValue; |
| if (childLiteral.getDatatype() != null && XMLDatatypeUtil.isNumericDatatype(childLiteral.getDatatype())) { |
| try { |
| sum = MathUtil.compute(sum, childLiteral, MathOp.PLUS); |
| } catch (final ValueExprEvaluationException e) { |
| log.error("A problem was encountered while updating a Sum Aggregation. This binding set will be ignored: " + childBindingSet); |
| return; |
| } |
| } |
| } |
| |
| // Update the state to include the new sum. |
| result.addBinding(resultName, sum); |
| } |
| } |
| } |