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.date;
  
  import com.bstek.ureport.Utils;
  import com.bstek.ureport.exception.ReportComputeException;
  import com.bstek.ureport.expression.function.Function;
  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 java.util.Calendar;
  import java.util.Date;
  import java.util.List;
  
  /**
   * @author
   * @since 1月22日
   */
  public abstract class CalendarFunction implements Function{
  	protected Calendar buildCalendar(List<ExpressionData<?>> dataList) {
  		Date date=new Date();
  		if(dataList!=null && dataList.size()>0){
  			ExpressionData<?> data=dataList.get(0);
  			if(data instanceof ObjectListExpressionData){
  				ObjectListExpressionData listData=(ObjectListExpressionData)data;
  				List<?> list=listData.getData();
  				if(list==null || list.size()!=1){
  					throw new ReportComputeException("Function [day] first parameter need a data of Date.");
  				}
  				Object obj=list.get(0);
  				if(obj==null){
  					throw new ReportComputeException("Function [day] first parameter can not be null.");
  				}
  				date=Utils.toDate(obj);
  			}else if(data instanceof ObjectExpressionData){
  				ObjectExpressionData objData=(ObjectExpressionData)data;
  				Object obj=objData.getData();
  				if(obj==null){
  					throw new ReportComputeException("Function [day] first parameter can not be null.");
  				}
  				date=Utils.toDate(obj);
  			}else{
  				throw new ReportComputeException("Function [day] first parameter need a data of Date.");
  			}
  		}
  		Calendar c=Calendar.getInstance();
  		c.setTime(date);
  		return c;
  	}
  }
  