content: /*******************************************************************************
   * Copyright 2017 Bstek
   *
   * 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.bstek.ureport.expression.function;
  
  import com.bstek.ureport.Utils;
  import com.bstek.ureport.build.BindData;
  import com.bstek.ureport.build.Context;
  import com.bstek.ureport.expression.model.data.BindDataListExpressionData;
  import com.bstek.ureport.expression.model.data.ExpressionData;
  import com.bstek.ureport.expression.model.data.ObjectExpressionData;
  import com.bstek.ureport.expression.model.data.ObjectListExpressionData;
  import com.bstek.ureport.model.Cell;
  import org.apache.commons.lang3.StringUtils;
  
  import java.math.BigDecimal;
  import java.util.List;
  
  /**
   * @author
   * @since 2016年12月27日
   */
  public class SumFunction implements Function {
  
  	@Override
  	public Object execute(List<ExpressionData<?>> dataList, Context context,Cell currentCell) {
  		if(dataList==null || dataList.size()==0){
  			return null;
  		}
  		Object singleData=null;
  		BigDecimal total=new BigDecimal(0);
  		for(ExpressionData<?> exprData:dataList){
  			if(exprData instanceof ObjectListExpressionData){
  				ObjectListExpressionData listExpr=(ObjectListExpressionData)exprData;
  				List<?> list=listExpr.getData();
  				for(Object obj:list){
  					if(obj==null || StringUtils.isBlank(obj.toString())){
  						continue;
  					}
  					singleData=obj;
  					BigDecimal bigData=Utils.toBigDecimal(obj);
  					total=total.add(bigData);
  				}
  			}else if(exprData instanceof ObjectExpressionData){
  				Object obj=exprData.getData();
  				singleData=obj;
  				if(obj!=null && StringUtils.isNotBlank(obj.toString())){
  					BigDecimal bigData=Utils.toBigDecimal(obj);
  					total=total.add(bigData);
  				}
  			}else if(exprData instanceof BindDataListExpressionData){
  				BindDataListExpressionData data=(BindDataListExpressionData)exprData;
  				List<BindData> bindDataList=data.getData();
  				for(BindData bindData:bindDataList){
  					Object obj=bindData.getValue();
  					if(obj==null || StringUtils.isBlank(obj.toString())){
  						continue;
  					}
  					singleData=obj;
  					BigDecimal bigData=Utils.toBigDecimal(obj);
  					total=total.add(bigData);
  				}
  			}
  		}
  		if(dataList.size()==1){
  			if(singleData==null || singleData.equals("")){
  				return "";
  			}
  		}
  		return total;
  	}
  
  	@Override
  	public String name() {
  		return "sum";
  	}
  }
  