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.model.expr;
  
  import com.bstek.ureport.build.BindData;
  import com.bstek.ureport.build.Context;
  import com.bstek.ureport.expression.model.Operator;
  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.util.ArrayList;
  import java.util.List;
  
  /**
   * @author
   * @since 1月15日
   */
  public class JoinExpression extends BaseExpression {
  	private static final long serialVersionUID = -9045259827109781135L;
  	private List<Operator> operators;
  	private List<BaseExpression> expressions;
  
  	public JoinExpression(List<Operator> operators, List<BaseExpression> expressions) {
  		this.operators = operators;
  		this.expressions = expressions;
  	}
  	@Override
  	protected ExpressionData<?> compute(Cell cell,Cell currentCell,Context context) {
  		if(expressions.size()==1){
  			return expressions.get(0).compute(cell, currentCell,context);
  		}
  		List<Object> list=new ArrayList<Object>();
  		for(int i=0;i<expressions.size();i++){
  			BaseExpression expression=expressions.get(i);
  			ExpressionData<?> data=expression.execute(cell, currentCell,context);
  			Object obj=null;
  			if(data instanceof ObjectExpressionData){
  				ObjectExpressionData d=(ObjectExpressionData)data;
  				obj=d.getData();
  			}else if(data instanceof ObjectListExpressionData){
  				ObjectListExpressionData d=(ObjectListExpressionData)data;
  				obj=d.getData();
  			}else if(data instanceof BindDataListExpressionData){
  				BindDataListExpressionData dataList=(BindDataListExpressionData)data;
  				List<BindData> bindList=dataList.getData();
  				if(bindList.size()==1){
  					BindData bindData=bindList.get(0);
  					obj=bindData.getValue();
  				}else{
  					StringBuilder sb=new StringBuilder();
  					for(BindData bd:bindList){
  						if(sb.length()>0){
  							sb.append(",");
  						}
  						sb.append(bd.getValue());
  					}
  					obj=sb.toString();
  				}
  			}
  			if(obj==null){
  				obj="";
  			}
  			list.add(obj);
  		}
  		String str=null;
  		for(int i=0;i<list.size();i++){
  			Object data=list.get(i);
  			if(str==null){
  				if(data instanceof String){
  					str="\""+data+"\"";
  					//str=""+data+"";
  				}else{
  					str=""+data+"";
  				}
  			}else{
  				Operator op=operators.get(i-1);
  				if(data instanceof String){
  					str+=""+op+"\""+data+"\"";
  					//str+=""+op+""+data+"";
  				}else{
  					str+=""+op+""+data+"";
  				}
  			}
  		}
  		Object obj=context.evalExpr(str);
  		return new ObjectExpressionData(obj);
  	}
  	public List<BaseExpression> getExpressions() {
  		return expressions;
  	}
  }
  