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.util.ArrayList;
  import java.util.List;
  
  /**
   * @author
   * @since 9月5日
   */
  public class GetFunction implements Function {
  
  	@Override
  	public Object execute(List<ExpressionData<?>> dataList, Context context,Cell currentCell) {
  		int index=1;
  		String propertyName=null;
  		List<Object> list= new ArrayList<Object>();
  		if(dataList.size()==1){
  			buildList(dataList.get(0),list);
  		}else if(dataList.size()==2){
  			buildList(dataList.get(0),list);
  			index = buildIndex(dataList.get(1));
  		}else if(dataList.size()==3){
  			buildList(dataList.get(0),list);
  			index = buildIndex(dataList.get(1));
  			ExpressionData<?> d=dataList.get(2);
  			if(d instanceof ObjectExpressionData){
  				ObjectExpressionData exprData=(ObjectExpressionData)d;
  				Object obj=exprData.getData();
  				if(obj!=null){
  					propertyName=obj.toString();
  				}
  			}
  		}
  		Object obj=null;
  		if(list.size()>0){
  			if(index<=list.size()){
  				obj = list.get(index-1);
  			}else{
  				obj = list.get(list.size()-1);
  			}
  		}
  		if(StringUtils.isNotBlank(propertyName)){
  			obj=Utils.getProperty(obj, propertyName);
  		}
  		return obj;
  	}
  
  	private int buildIndex(ExpressionData<?> d) {
  		int index=1;
  		if(d instanceof ObjectExpressionData){
  			ObjectExpressionData exprData=(ObjectExpressionData)d;
  			Object obj=exprData.getData();
  			if(obj!=null){
  				index=Utils.toBigDecimal(obj).intValue();
  			}
  		}
  		return index;
  	}
  
  	private void buildList(ExpressionData<?> d, List<Object> list) {
  		if(d instanceof ObjectExpressionData){
  			ObjectExpressionData exprData=(ObjectExpressionData)d;
  			list.add(exprData.getData());
  		}else if(d instanceof ObjectListExpressionData){
  			ObjectListExpressionData listData=(ObjectListExpressionData)d;
  			list.addAll(listData.getData());
  		}else if(d instanceof BindDataListExpressionData){
  			BindDataListExpressionData listData=(BindDataListExpressionData)d;
  			for(BindData bindData:listData.getData()){
  				list.addAll(bindData.getDataList());
  			}
  		}
  	}
  
  	@Override
  	public String name() {
  		return "get";
  	}
  }
  