fix #409 .

ureport2-core/src/main/java/com/bstek/ureport/Utils.java

@@ -82,7 +82,7 @@ public static Connection getBuildinConnection(String name){
 
 	public static List<Cell> fetchTargetCells(Cell cell,Context context,String cellName){
 		while(!context.isCellPocessed(cellName)){
-			context.getReportBuilder().buildCell(context, null);
+			context.getReportBuilder().buildCellExactly(context, cellName);
 		}
 		List<Cell> leftCells=fetchCellsByLeftParent(context,cell, cellName);
 		List<Cell> topCells=fetchCellsByTopParent(context,cell, cellName);

ureport2-core/src/main/java/com/bstek/ureport/build/Context.java

@@ -266,6 +266,10 @@ public List<Cell> nextUnprocessedCells(){
 		}
 		return targetCellsList;
 	}
+
+	public List<Cell> getUnprocessedCells(String cellName){
+		return unprocessedCellsMap.remove(cellName);
+	}
 
 	public Object evalExpr(String expression){
 		return new ElCompute().doCompute(expression);

ureport2-core/src/main/java/com/bstek/ureport/build/ReportBuilder.java

@@ -116,7 +116,21 @@ public void buildCell(Context context,List<Cell> cells){
 			}
 		}
 	}
-
+
+	public void buildCellExactly(Context context, String cellName) {
+		List<Cell> cells = context.getUnprocessedCells(cellName);
+		Cell cell = cells.get(0);
+		Cell leftParent = cell.getLeftParentCell();
+		Cell topParent = cell.getTopParentCell();
+		if (leftParent != null && !leftParent.isProcessed()) {
+			buildCellExactly(context, leftParent.getName());
+		}
+		if (topParent != null && !topParent.isProcessed()) {
+			buildCellExactly(context, topParent.getName());
+		}
+		buildCell(context, cells);
+	}
+
 	private Map<String,Dataset> buildDatasets(ReportDefinition reportDefinition,Map<String,Object> parameters,ApplicationContext applicationContext){
 		Map<String,Dataset> datasetMap=new HashMap<String,Dataset>();
 		List<DatasourceDefinition> datasources=reportDefinition.getDatasources();

ureport2-core/src/main/java/com/bstek/ureport/expression/model/expr/cell/CellObjectExpression.java

@@ -37,7 +37,7 @@ public CellObjectExpression(String property) {
 	@Override
 	protected ExpressionData<?> compute(Cell cell, Cell currentCell,Context context) {
 		while(!context.isCellPocessed(cell.getName())){
-			context.getReportBuilder().buildCell(context, null);
+			context.getReportBuilder().buildCellExactly(context, cell.getName());
 		}
 		if(StringUtils.isNotBlank(property)){
 			Object obj=Utils.getProperty(cell, property);

ureport2-core/src/main/java/com/bstek/ureport/expression/model/expr/cell/CellValueExpression.java

@@ -31,7 +31,7 @@ public class CellValueExpression extends BaseExpression{
 	@Override
 	protected ExpressionData<?> compute(Cell cell, Cell currentCell,Context context) {
 		while(!context.isCellPocessed(cell.getName())){
-			context.getReportBuilder().buildCell(context, null);
+			context.getReportBuilder().buildCellExactly(context, cell.getName());
 		}
 		return new ObjectExpressionData(cell.getData());
 	}

ureport2-core/src/main/java/com/bstek/ureport/expression/model/expr/set/CellCoordinateExpression.java

@@ -66,7 +66,7 @@ public boolean supportPaging(){
 	@Override
 	protected ExpressionData<?> compute(Cell cell,Cell currentCell, Context context) {
 		while(!context.isCellPocessed(cellName)){
-			context.getReportBuilder().buildCell(context, null);
+			context.getReportBuilder().buildCellExactly(context, cellName);
 		}
 		List<Cell> leftCellList = buildLeftCells(cell, context);
 		List<Cell> topCellList=buildTopCells(cell, context);
@@ -121,7 +121,7 @@ private List<Cell> buildLeftCells(Cell cell, Context context) {
 		for(CellCoordinate coordinate:leftCoordinates){
 			String name=coordinate.getCellName();
 			while(!context.isCellPocessed(name)){
-				context.getReportBuilder().buildCell(context, null);
+				context.getReportBuilder().buildCellExactly(context, name);
 			}
 			if(targetLeftCell==null){
 				if(coordinate.getCoordinateType().equals(CoordinateType.relative)){
@@ -207,7 +207,7 @@ private List<Cell> buildTopCells(Cell cell, Context context) {
 		for(CellCoordinate coordinate:topCoordinates){
 			String name=coordinate.getCellName();
 			while(!context.isCellPocessed(name)){
-				context.getReportBuilder().buildCell(context, null);
+				context.getReportBuilder().buildCellExactly(context, name);
 			}
 			if(cellList==null){
 				if(coordinate.getCoordinateType().equals(CoordinateType.relative)){

ureport2-core/src/main/java/com/bstek/ureport/expression/model/expr/set/WholeCellExpression.java

@@ -42,7 +42,7 @@ public boolean supportPaging(){
 	@Override
 	protected ExpressionData<?> compute(Cell cell, Cell currentCell,Context context) {
 		while(!context.isCellPocessed(cellName)){
-			context.getReportBuilder().buildCell(context, null);
+			context.getReportBuilder().buildCellExactly(context, cellName);
 		}
 		List<Cell> cells=context.getReport().getCellsMap().get(cellName);
 		List<Object> list=new ArrayList<Object>();