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.exception.ReportComputeException;
  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 java.math.BigDecimal;
  import java.text.DecimalFormat;
  import java.util.List;
  
  /**
   * @author
   * @since 5月23日
   */
  public class FormatNumberFunction implements Function {
  	private final String defaultPattern="#";
  	@Override
  	public Object execute(List<ExpressionData<?>> dataList, Context context,Cell currentCell) {
  		if(dataList==null){
  			return "";
  		}
  		Object obj=null;
  		String pattern=defaultPattern;
  		if(dataList.size()==1){
  			obj = buildExpressionData(dataList.get(0));
  		}else if(dataList.size()>1){
  			obj = buildExpressionData(dataList.get(0));
  			Object patternData=buildExpressionData(dataList.get(1));
  			if(patternData!=null){
  				pattern=patternData.toString();
  			}
  		}
  
  		if(obj==null){
  			throw new ReportComputeException("Function [formatnumber] need a number parameter at least");
  		}else{
  			BigDecimal bigData=Utils.toBigDecimal(obj);
  			DecimalFormat df=new DecimalFormat(pattern);
  			return df.format(bigData.doubleValue());
  		}
  	}
  
  	private Object buildExpressionData(ExpressionData<?> data) {
  		if(data instanceof ObjectListExpressionData){
  			ObjectListExpressionData listExpressionData=(ObjectListExpressionData)data;
  			List<?> list=listExpressionData.getData();
  			if(list.size()>0){
  				return list.get(0);
  			}
  		}else if(data instanceof ObjectExpressionData){
  			return ((ObjectExpressionData)data).getData();
  		}else if(data instanceof BindDataListExpressionData){
  			BindDataListExpressionData bindDataList=(BindDataListExpressionData)data;
  			List<BindData> list=bindDataList.getData();
  			if(list.size()>0){
  				return list.get(0).getValue();
  			}
  		}
  		return null;
  	}
  
  	@Override
  	public String name() {
  		return "formatnumber";
  	}
  }
  