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.Utils;
  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.expression.model.data.ObjectListExpressionData;
  import com.bstek.ureport.expression.model.expr.set.CellExpression;
  import com.bstek.ureport.model.Cell;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author
   * @since 1月21日
   */
  public class RelativeCellExpression extends CellExpression {
  	private static final long serialVersionUID = 8826396779392348224L;
  	public RelativeCellExpression(String cellName) {
  		super(cellName);
  	}
  	@Override
  	public boolean supportPaging(){
  		return false;
  	}
  	@Override
  	protected ExpressionData<?> compute(Cell cell,Cell currentCell, Context context) {
  		List<Cell> targetCells=Utils.fetchTargetCells(currentCell, context, cellName);
  		int size=targetCells.size();
  		if(size==0){
  			throw new ReportComputeException("Unknow cell "+cellName);
  		}else if(size==1){
  			return new ObjectExpressionData(targetCells.get(0).getData());
  		}else{
  			Cell targetCell=null;
  			for(Cell c:targetCells){
  				if(c.getRow()==currentCell.getRow() || c.getColumn()==currentCell.getColumn()){
  					targetCell=c;
  					break;
  				}
  			}
  			if(targetCell!=null){
  				return new ObjectExpressionData(targetCell.getData());
  			}else{
  				List<Object> list=new ArrayList<Object>();
  				for(Cell c:targetCells){
  					list.add(c.getData());
  				}
  				return new ObjectListExpressionData(list);
  			}
  		}
  	}
  }
  