htmlnewspapertablerenderer.java

一个使用struts+hibernate+spring开发的完的网站源代码。

     * Render table headers and footers.
     */
    private void renderFacet(FacesContext facesContext, ResponseWriter writer, HtmlNewspaperTable newspaperTable, boolean header) throws IOException {
        int columnCount = countColumns(newspaperTable);
        boolean hasColumnFacet = hasFacet(newspaperTable, header);
        UIComponent facet = header ? newspaperTable.getHeader() : newspaperTable.getFooter();
        
        // quit if there's nothing to draw
        if(facet == null && !hasColumnFacet) return;
        
        // start the row block
        HtmlRendererUtils.writePrettyLineSeparator(facesContext);
        String elemName = header ? HTML.THEAD_ELEM : HTML.TFOOT_ELEM;
        writer.startElement(elemName, newspaperTable);
        
        // fetch the style
        String styleClass;
        if(header) styleClass = getHeaderClass(newspaperTable);
        else styleClass = getFooterClass(newspaperTable);
        
        // write the header row and column headers
        if(header) {
            if (facet != null) renderTableHeaderOrFooterRow(facesContext, writer, newspaperTable, facet, styleClass, HTML.TD_ELEM, columnCount);
            if (hasColumnFacet) renderColumnHeaderOrFooterRow(facesContext, writer, newspaperTable, styleClass, header);
        // write the footer row and column footers
        } else {
            if (hasColumnFacet) renderColumnHeaderOrFooterRow(facesContext, writer, newspaperTable, styleClass, header);
            if (facet != null) renderTableHeaderOrFooterRow(facesContext, writer, newspaperTable, facet, styleClass, HTML.TD_ELEM, columnCount);
        }
        
        // end the row block
        writer.endElement(elemName);
    }
    
    /**
     * Renders the table header or footer row. This is one giant cell that spans
     * the entire table header or footer.
     */
    private void renderTableHeaderOrFooterRow(FacesContext facesContext, ResponseWriter writer,
        HtmlNewspaperTable newspaperTable, UIComponent facet, String styleClass, String colElementName, int tableColumns)
        throws IOException {

        // start the row
        HtmlRendererUtils.writePrettyLineSeparator(facesContext);
        writer.startElement(HTML.TR_ELEM, newspaperTable);
        writer.startElement(colElementName, newspaperTable);
        if(styleClass != null) writer.writeAttribute(HTML.CLASS_ATTR, styleClass, null);
        if(colElementName.equals(HTML.TH_ELEM)) writer.writeAttribute(HTML.SCOPE_ATTR, HTML.SCOPE_COLGROUP_VALUE, null);

        // span all the table's columns
        int totalColumns = newspaperTable.getNewspaperColumns() * tableColumns;
        if(newspaperTable.getSpacer() != null) totalColumns = totalColumns + getNewspaperColumns() - 1;
        writer.writeAttribute(HTML.COLSPAN_ATTR, new Integer(totalColumns), null);

        // write the actual cell contents
        if(facet != null) RendererUtils.renderChild(facesContext, facet);
        
        // finish
        writer.endElement(colElementName);
        writer.endElement(HTML.TR_ELEM);
    }


    /**
     * Renders the column header or footer row.
     */
    private void renderColumnHeaderOrFooterRow(FacesContext facesContext,
        ResponseWriter writer, HtmlNewspaperTable newspaperTable, String styleClass, boolean header)
        throws IOException {

        HtmlRendererUtils.writePrettyLineSeparator(facesContext);
        writer.startElement(HTML.TR_ELEM, newspaperTable);
        int newspaperColumns = newspaperTable.getNewspaperColumns();
        for(int nc = 0; nc < newspaperColumns; nc++) {
            for(Iterator it = newspaperTable.getChildren().iterator(); it.hasNext(); ) {
                UIComponent uiComponent = (UIComponent)it.next();
                if(!(uiComponent instanceof UIColumn)) continue;
                UIColumn column = (UIColumn)uiComponent;
                if(!column.isRendered()) continue;
                // get the component to render
                UIComponent facet = null;
                if(header) facet = column.getHeader();
                else facet = column.getFooter();
                // do the rendering of the cells
                renderColumnHeaderOrFooterCell(facesContext, writer, column, styleClass, facet);
            }

            // draw the spacer facet
            if(nc < newspaperColumns - 1) renderSpacerCell(facesContext, writer, newspaperTable);
        }
        writer.endElement(HTML.TR_ELEM);
    }

    /**
     * Renders a cell in the column header or footer.
     */
    private void renderColumnHeaderOrFooterCell(FacesContext facesContext, ResponseWriter writer,
        UIColumn uiColumn, String styleClass, UIComponent facet) throws IOException {

        writer.startElement(HTML.TH_ELEM, uiColumn);
        if(styleClass != null) writer.writeAttribute(HTML.CLASS_ATTR, styleClass, null);
        if(facet != null) RendererUtils.renderChild(facesContext, facet);
        writer.endElement(HTML.TH_ELEM);
    }
    
    /**
     * Renders a spacer between adjacent newspaper columns.
     */
    private void renderSpacerCell(FacesContext facesContext, ResponseWriter writer,
        HtmlNewspaperTable newspaperTable) throws IOException {
        if(newspaperTable.getSpacer() == null) return;
        
        writer.startElement(HTML.TD_ELEM, newspaperTable);
        RendererUtils.renderChild(facesContext, newspaperTable.getSpacer());
        writer.endElement(HTML.TD_ELEM);
    }

    /**
     * Gets the style class for the table header.
     */
    private static String getHeaderClass(HtmlNewspaperTable newspaperTable) {
        if(newspaperTable instanceof HtmlDataTable) {
            return ((HtmlDataTable)newspaperTable).getHeaderClass();
        } else {
            return (String)newspaperTable.getAttributes().get(JSFAttr.HEADER_CLASS_ATTR);
        }
    }
    /**
     * Gets the style class for the table footer.
     */
    private static String getFooterClass(HtmlNewspaperTable newspaperTable) {
        if(newspaperTable instanceof HtmlDataTable) {
            return ((HtmlDataTable)newspaperTable).getFooterClass();
        } else {
            return (String)newspaperTable.getAttributes().get(JSFAttr.FOOTER_CLASS_ATTR);
        }
    }

    /**
     * Gets styles for the specified component.
     */
    public static Styles getStyles(HtmlNewspaperTable newspaperTable) {
        String rowClasses;
        String columnClasses;
        if(newspaperTable instanceof HtmlDataTable) {
            rowClasses = ((HtmlDataTable)newspaperTable).getRowClasses();
            columnClasses = ((HtmlDataTable)newspaperTable).getColumnClasses();
        } else {
            rowClasses = (String)newspaperTable.getAttributes().get(JSFAttr.ROW_CLASSES_ATTR);
            columnClasses = (String)newspaperTable.getAttributes().get(JSFAttr.COLUMN_CLASSES_ATTR);
        }
        return new Styles(rowClasses, columnClasses);
    }

    /**
     * Class manages the styles from String lists.
     */
    private static class Styles {

        private String[] _columnStyle;
        private String[] _rowStyle;

        Styles(String rowStyles, String columnStyles) {
            _rowStyle = (rowStyles == null)
                ? ArrayUtils.EMPTY_STRING_ARRAY
                : StringUtils.trim(
                    StringUtils.splitShortString(rowStyles, ','));
            _columnStyle = (columnStyles == null)
                ? ArrayUtils.EMPTY_STRING_ARRAY
                : StringUtils.trim(
                    StringUtils.splitShortString(columnStyles, ','));
        }

        public String getRowStyle(int idx) {
            if(!hasRowStyle()) {
                return null;
            }
            return _rowStyle[idx % _rowStyle.length];
        }

        public String getColumnStyle(int idx) {
            if(!hasColumnStyle()) {
                return null;
            }
            return _columnStyle[idx % _columnStyle.length];
        }

        public boolean hasRowStyle() {
            return _rowStyle.length > 0;
        }

        public boolean hasColumnStyle() {
            return _columnStyle.length > 0;
        }
    }
}