/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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 org.seasar.teeda.core.render.html;

 import java.io.IOException;

 import java.util.Iterator;

 import javax.faces.component.UIComponent;

 import javax.faces.component.html.HtmlPanelGrid;

 import javax.faces.context.FacesContext;

 import javax.faces.context.ResponseWriter;

 import javax.faces.internal.IgnoreAttribute;

 import org.seasar.teeda.core.JsfConstants;

 import org.seasar.teeda.core.render.AbstractRenderer;

 import org.seasar.teeda.core.util.LoopIterator;

 import org.seasar.teeda.core.util.RendererUtil;

 /**

  * @author manhole

  */

 public class HtmlPanelGridRenderer extends AbstractRenderer {

     public static final String COMPONENT_FAMILY = "javax.faces.Panel";

     public static final String RENDERER_TYPE = "javax.faces.Grid";

     private final IgnoreAttribute ignoreComponent = new IgnoreAttribute();

     {

         ignoreComponent.addAttributeName(JsfConstants.ID_ATTR);

         ignoreComponent.addAttributeName(JsfConstants.HEADER_CLASS_ATTR);

         ignoreComponent.addAttributeName(JsfConstants.FOOTER_CLASS_ATTR);

         ignoreComponent.addAttributeName(JsfConstants.COLUMNS_ATTR);

         ignoreComponent.addAttributeName(JsfConstants.COLUMN_CLASSES_ATTR);

         ignoreComponent.addAttributeName(JsfConstants.ROW_CLASSES_ATTR);

     }

     public void encodeBegin(FacesContext context, UIComponent component)

             throws IOException {

         assertNotNull(context, component);

         if (!component.isRendered()) {

             return;

         }

         encodeHtmlPanelGridBegin(context, (HtmlPanelGrid) component);

     }

     protected void encodeHtmlPanelGridBegin(FacesContext context,

             HtmlPanelGrid htmlPanelGrid) throws IOException {

         ResponseWriter writer = context.getResponseWriter();

         writer.startElement(JsfConstants.TABLE_ELEM, htmlPanelGrid);

         RendererUtil.renderIdAttributeIfNecessary(writer, htmlPanelGrid,

                 getIdForRender(context, htmlPanelGrid));

         renderRemainAttributes(htmlPanelGrid, writer, ignoreComponent);

         // thead

         {

             UIComponent tableHeader = toNullIfNotRendered(htmlPanelGrid

                     .getFacet("header"));

             if (tableHeader != null) {

                 writer.startElement(JsfConstants.THEAD_ELEM, tableHeader);

                 writer.startElement(JsfConstants.TR_ELEM, tableHeader);

                 writer.startElement(JsfConstants.TH_ELEM, tableHeader);

                 RendererUtil.renderAttribute(writer, JsfConstants.COLSPAN_ATTR,

                         new Integer(getColumns(htmlPanelGrid)));

                 writer.writeAttribute(JsfConstants.SCOPE_ATTR,

                         JsfConstants.COLGROUP_VALUE, null);

                 RendererUtil.renderAttribute(writer, JsfConstants.CLASS_ATTR,

                         htmlPanelGrid.getHeaderClass(),

                         JsfConstants.HEADER_CLASS_ATTR);

                 encodeComponent(context, tableHeader);

                 writer.endElement(JsfConstants.TH_ELEM);

                 closeTr(writer);

                 writer.endElement(JsfConstants.THEAD_ELEM);

             }

         }

         // tfoot

         {

             UIComponent tableFooter = toNullIfNotRendered(htmlPanelGrid

                     .getFacet("footer"));

             if (tableFooter != null) {

                 writer.startElement(JsfConstants.TFOOT_ELEM, tableFooter);

                 writer.startElement(JsfConstants.TR_ELEM, tableFooter);

                 writer.startElement(JsfConstants.TD_ELEM, tableFooter);

                 RendererUtil.renderAttribute(writer, JsfConstants.COLSPAN_ATTR,

                         new Integer(getColumns(htmlPanelGrid)));

                 RendererUtil.renderAttribute(writer, JsfConstants.CLASS_ATTR,

                         htmlPanelGrid.getFooterClass(),

                         JsfConstants.FOOTER_CLASS_ATTR);

                 encodeComponent(context, tableFooter);

                 writer.endElement(JsfConstants.TD_ELEM);

                 closeTr(writer);

                 writer.endElement(JsfConstants.TFOOT_ELEM);

             }

         }

     }

     public void encodeChildren(FacesContext context, UIComponent component)

             throws IOException {

         assertNotNull(context, component);

         if (!component.isRendered()) {

             return;

         }

         encodeHtmlPanelGridChildren(context, (HtmlPanelGrid) component);

     }

     protected void encodeHtmlPanelGridChildren(FacesContext context,

             HtmlPanelGrid htmlPanelGrid) throws IOException {

         ResponseWriter writer = context.getResponseWriter();

         writer.startElement(JsfConstants.TBODY_ELEM, htmlPanelGrid);

         LoopIterator rowClasses = toStyleLoopIterator(htmlPanelGrid

                 .getRowClasses());

         LoopIterator columnClasses = toStyleLoopIterator(htmlPanelGrid

                 .getColumnClasses());

         final int maxColumns = getColumns(htmlPanelGrid);

         final int initialPosition = 0;

         int position = initialPosition;

         boolean trTagOpening = false;

         for (Iterator itChild = getRenderedChildrenIterator(htmlPanelGrid); itChild

                 .hasNext();) {

             UIComponent child = (UIComponent) itChild.next();

             if (position == initialPosition) {

                 openTr(writer, htmlPanelGrid, rowClasses, columnClasses);

                 trTagOpening = true;

             }

             encodeBodyRowColumn(context, child, writer, columnClasses);

             position++;

             if (maxColumns <= position) {

                 position = initialPosition;

                 closeTr(writer);

                 trTagOpening = false;

             }

         }

         if (trTagOpening) {

             closeTr(writer);

             trTagOpening = false;

         }

         writer.endElement(JsfConstants.TBODY_ELEM);

     }

     private void openTr(ResponseWriter writer, HtmlPanelGrid htmlPanelGrid,

             LoopIterator rowClasses, LoopIterator columnClasses)

             throws IOException {

         writer.startElement(JsfConstants.TR_ELEM, htmlPanelGrid);

         if (rowClasses.hasNext()) {

             RendererUtil.renderAttribute(writer, JsfConstants.CLASS_ATTR,

                     rowClasses.next(), JsfConstants.ROW_CLASSES_ATTR);

         }

         columnClasses.reset();

     }

     private void closeTr(ResponseWriter writer) throws IOException {

         writer.endElement(JsfConstants.TR_ELEM);

     }

     private void encodeBodyRowColumn(FacesContext context,

             UIComponent component, ResponseWriter writer, Iterator columnClasses)

             throws IOException {

         writer.startElement(JsfConstants.TD_ELEM, component);

         if (columnClasses.hasNext()) {

             RendererUtil.renderAttribute(writer, JsfConstants.CLASS_ATTR,

                     columnClasses.next(), JsfConstants.COLUMN_CLASSES_ATTR);

         }

         encodeComponent(context, component);

         writer.endElement(JsfConstants.TD_ELEM);

     }

     public void encodeEnd(FacesContext context, UIComponent component)

             throws IOException {

         assertNotNull(context, component);

         if (!component.isRendered()) {

             return;

         }

         encodeHtmlPanelGridEnd(context, (HtmlPanelGrid) component);

     }

     protected void encodeHtmlPanelGridEnd(FacesContext context,

             HtmlPanelGrid htmlPanelGrid) throws IOException {

         ResponseWriter writer = context.getResponseWriter();

         writer.endElement(JsfConstants.TABLE_ELEM);

     }

     public boolean getRendersChildren() {

         return true;

     }

     private int getColumns(HtmlPanelGrid htmlPanelGrid) {

         int columns = htmlPanelGrid.getColumns();

         if (columns <= 0) {

             columns = 1;

         }

         return columns;

     }

 }