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.build.Context;
  import com.bstek.ureport.exception.ReportComputeException;
  import com.bstek.ureport.expression.model.data.ExpressionData;
  import com.bstek.ureport.expression.model.data.ObjectExpressionData;
  import com.bstek.ureport.model.Cell;
  
  import java.text.SimpleDateFormat;
  import java.util.Calendar;
  import java.util.Date;
  import java.util.List;
  
  /**
   * @author
   * @since 1月22日
   */
  public class DateFunction extends CalendarFunction {
  	private String pattern="yyyy-MM-dd HH:mm:ss";
  	@Override
  	public Object execute(List<ExpressionData<?>> dataList, Context context,Cell currentCell) {
  		SimpleDateFormat sd=new SimpleDateFormat(pattern);
  		Date date=new Date();
  		if(dataList.size()==1){
  			ExpressionData<?> data=dataList.get(0);
  			sd=buildPattern(data);
  		}
  		if(dataList.size()==2){
  			Calendar c = buildCalendar(dataList);
  			date=c.getTime();
  			ExpressionData<?> data=dataList.get(1);
  			sd=buildPattern(data);
  		}
  		return sd.format(date);
  	}
  
  	private SimpleDateFormat buildPattern(ExpressionData<?> data) {
  		SimpleDateFormat sd=null;
  		if(data instanceof ObjectExpressionData){
  			ObjectExpressionData objectData=(ObjectExpressionData)data;
  			String newPattern=(String)objectData.getData();
  			sd=new SimpleDateFormat(newPattern);
  		}else{
  			throw new ReportComputeException("Unknow date format pattern:"+data.getData());
  		}
  		return sd;
  	}
  
  	@Override
  	public String name() {
  		return "date";
  	}
  }
  