com.github.javaclub.cdl.client.matrix.merger.aggregation.AccumulationAggregationUnit Maven / Gradle / Ivy

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/**
 * Copyright 1999-2015 dangdang.com.
 * 
 * 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 com.github.javaclub.cdl.client.matrix.merger.aggregation;

import java.math.BigDecimal;

import com.github.javaclub.cdl.client.matrix.merger.common.ResultSetUtil;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;

/**
 * 累加聚合单元.
 * 
 * @author zhangliang
 */
@RequiredArgsConstructor
@Slf4j
public final class AccumulationAggregationUnit extends AbstractAggregationUnit {

	private final Class returnType;

	private BigDecimal result;

	@Override
	public void doMerge(final Comparable... values) {
		if (null == values || null == values[0]) {
			return;
		}
		if (null == result) {
			result = new BigDecimal("0");
		}
		result = result.add(new BigDecimal(values[0].toString()));
		log.trace("Accumulation result: {}", result.toString());
	}

	@Override
	public Comparable getResult() {
		return (Comparable) ResultSetUtil.convertValue(result, returnType);
	}
}