| /* |
| * 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.giraph.aggregators.matrix; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * The abstract matrix aggregator contains the prefix name of the vector |
| * aggregators that have the values of the rows. It also cashes the names to |
| * avoid creating the same string multiples times. |
| */ |
| public abstract class MatrixSumAggregator { |
| /** |
| * The prefix name of the vector aggregators. The aggregator names are created |
| * as (name0, name1, ...). |
| */ |
| private String name; |
| /** Cache the names of the columns */ |
| private ArrayList<String> names = new ArrayList<>(); |
| |
| /** |
| * Create a new matrix aggregator with the given prefix name for the vector |
| * aggregators. |
| * |
| * @param name the prefix for the row vector aggregators |
| */ |
| public MatrixSumAggregator(String name) { |
| this.name = name; |
| } |
| |
| /** |
| * Get the name of the aggreagator of the row with the index specified. |
| * |
| * @param i the row of the matrix |
| * @return the name of the aggregator |
| */ |
| protected String getRowAggregatorName(int i) { |
| for (int n = names.size(); n <= i; ++n) { |
| names.add(name + n); |
| } |
| return names.get(i); |
| } |
| } |