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.ReportException;
  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.codehaus.jackson.map.ObjectMapper;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * @author
   * @since 1月3日
   */
  public class JsonFunction implements Function {
  
  	@Override
  	public Object execute(List<ExpressionData<?>> dataList, Context context,Cell currentCell){
  		if(dataList.size()!=2){
  			return null;
  		}
  		String obj = buildData(dataList.get(0));
  		String property=buildData(dataList.get(1));
  
  		if(obj==null || property==null || obj.equals("") || property.equals("")){
  			return null;
  		}
  		ObjectMapper mapper=new ObjectMapper();
  		try{
  			Map<?,?> map=mapper.readValue(obj, HashMap.class);
  			return Utils.getProperty(map, property);
  		}catch(Exception ex){
  			throw new ReportException(ex);
  		}
  	}
  
  	private String buildData(ExpressionData<?> exprData) {
  		String obj=null;
  		if(exprData instanceof ObjectExpressionData){
  			ObjectExpressionData objData=(ObjectExpressionData)exprData;
  			Object data=objData.getData();
  			if(data!=null){
  				obj=data.toString();
  			}
  		}else if(exprData instanceof ObjectListExpressionData){
  			ObjectListExpressionData listData=(ObjectListExpressionData)exprData;
  			List<?> list=listData.getData();
  			if(list.size()==1){
  				Object data=list.get(0);
  				if(data!=null){
  					obj=data.toString();
  				}
  			}
  		}else if(exprData instanceof BindDataListExpressionData){
  			BindDataListExpressionData listData=(BindDataListExpressionData)exprData;
  			List<BindData> list=listData.getData();
  			if(list.size()==1){
  				Object data=list.get(0).getValue();
  				if(data!=null){
  					obj=data.toString();
  				}
  			}
  		}
  		return obj;
  	}
  
  	@Override
  	public String name() {
  		return "json";
  	}
  }
  