MinFrequency.java
- /*
- * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
- *
- * 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 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.gradoop.flink.algorithms.fsm.transactional.tle.functions;
- import org.apache.flink.api.common.functions.MapFunction;
- import org.gradoop.flink.algorithms.fsm.transactional.common.FSMConfig;
- import java.math.BigDecimal;
- /**
- * Calculates the min frequency based on a configured min support.
- */
- public class MinFrequency implements MapFunction<Long, Long> {
- /**
- * FSM configuration
- */
- private final FSMConfig fsmConfig;
- /**
- * Constructor.
- * @param fsmConfig FSM configuration
- */
- public MinFrequency(FSMConfig fsmConfig) {
- this.fsmConfig = fsmConfig;
- }
- @Override
- public Long map(Long count) throws Exception {
- return BigDecimal.valueOf(count)
- .multiply(
- BigDecimal.valueOf(fsmConfig.getMinSupport())
- .setScale(2, BigDecimal.ROUND_HALF_UP)
- )
- .setScale(0, BigDecimal.ROUND_UP)
- .longValue();
- }
- }