| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.pregelix.core.jobgen; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory; |
| import edu.uci.ics.pregelix.core.jobgen.provider.NormalizedKeyComputerFactoryProvider; |
| import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory; |
| |
| @SuppressWarnings({ "rawtypes", "unchecked" }) |
| public class JobGenUtil { |
| |
| /** |
| * get normalized key factory for an iteration, to sort messages iteration |
| * 1: asc order iteration 2: desc order |
| * |
| * @param iteration |
| * @param keyClass |
| * @return |
| */ |
| public static INormalizedKeyComputerFactory getINormalizedKeyComputerFactory(int iteration, Class keyClass) { |
| return NormalizedKeyComputerFactoryProvider.INSTANCE.getAscINormalizedKeyComputerFactory(keyClass); |
| } |
| |
| /** |
| * get comparator for an iteration, to sort messages iteration 1: asc order |
| * iteration 0: desc order |
| * |
| * @param iteration |
| * @param keyClass |
| * @return |
| */ |
| public static IBinaryComparatorFactory getIBinaryComparatorFactory(int iteration, Class keyClass) { |
| return new WritableComparingBinaryComparatorFactory(keyClass); |
| } |
| |
| /** |
| * get the B-tree scan order for an iteration iteration 1: desc order, |
| * backward scan iteration 2: asc order, forward scan |
| * |
| * @param iteration |
| * @return |
| */ |
| public static boolean getForwardScan(int iteration) { |
| return true; |
| } |
| |
| } |