Java tutorial
/********************************************************************************** * $URL: https://source.sakaiproject.org/contrib/ufp/usermembership/trunk/tool/src/java/org/sakaiproject/umem/tool/jsf/HtmlSortHeaderRenderer.java $ * $Id: HtmlSortHeaderRenderer.java 4381 2007-03-21 11:25:54Z nuno@ufp.pt $ *********************************************************************************** * * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 The Sakai Foundation * * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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. * **********************************************************************************/ /* * Based very slightly on org.apache.myfaces.custom.sortheader.HtmlSortHeaderRenderer * and HtmlSortHeaderRenderer.java from jholtzman@berkeley.edu * (Only about a half-dozen lines of code are in common.) * * The original file's license header is below. */ /* * Copyright 2004 The Apache Software Foundation. * * 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.sakaiproject.umem.tool.jsf; import java.io.IOException; import javax.faces.component.UIComponent; import javax.faces.component.html.HtmlGraphicImage; import javax.faces.context.FacesContext; import javax.faces.context.ResponseWriter; import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.myfaces.component.UserRoleUtils; import org.apache.myfaces.component.html.ext.HtmlDataTable; import org.apache.myfaces.custom.sortheader.HtmlCommandSortHeader; import org.apache.myfaces.shared_impl.renderkit.html.HTML; import org.apache.myfaces.shared_impl.renderkit.html.HtmlLinkRendererBase; /** * Based on org.apache.myfaces.custom.sortheader.HtmlSortHeaderRenderer. * Modified to better distinguish the current sort column and to use an image * file to indicate direction. * @author <a href="mailto:jholtzman@berkeley.edu">Josh Holtzman </a> */ public class HtmlSortHeaderRenderer extends HtmlLinkRendererBase { private static final Log log = LogFactory.getLog(HtmlSortHeaderRenderer.class); public final static String CURRENT_SORT_STYLE = "currentSort"; public final static String NOT_CURRENT_SORT_STYLE = "notCurrentSort"; public void encodeBegin(FacesContext facesContext, UIComponent component) throws IOException { // If this is a currently sorted sort header, always give it the // "currentSort" CSS style class try { if (component instanceof HtmlCommandSortHeader) { HtmlCommandSortHeader sortHeader = (HtmlCommandSortHeader) component; String styleClass = StringUtils.trimToNull(getStyleClass(facesContext, component)); String newStyleClass; String unStyleClass; if (sortHeader.findParentDataTable().getSortColumn().equals(sortHeader.getColumnName())) { newStyleClass = CURRENT_SORT_STYLE; unStyleClass = NOT_CURRENT_SORT_STYLE; } else { newStyleClass = NOT_CURRENT_SORT_STYLE; unStyleClass = CURRENT_SORT_STYLE; } if (StringUtils.indexOf(styleClass, newStyleClass) == -1) { if (StringUtils.indexOf(styleClass, unStyleClass) != -1) { styleClass = StringUtils.replace(styleClass, unStyleClass, newStyleClass); } else if (styleClass != null) { styleClass = (new StringBuilder(styleClass)).append(' ').append(newStyleClass).toString(); } else { styleClass = newStyleClass; } sortHeader.setStyleClass(styleClass); } } } catch (Exception e) { log.warn("Exception occurred in HtmlSortHeaderRenderer:" + e.getMessage()); } super.encodeBegin(facesContext, component); // check for NP } public void encodeEnd(FacesContext facesContext, UIComponent component) throws IOException { try { if (log.isDebugEnabled()) log.debug("encodeEnd rendering " + component); if (!UserRoleUtils.isEnabledOnUserRole(component)) { super.encodeEnd(facesContext, component); } else { HtmlCommandSortHeader sortHeader = (HtmlCommandSortHeader) component; HtmlDataTable dataTable = sortHeader.findParentDataTable(); if (sortHeader.isArrow() && sortHeader.getColumnName().equals(dataTable.getSortColumn())) { ResponseWriter writer = facesContext.getResponseWriter(); writer.write(HTML.NBSP_ENTITY); HtmlGraphicImage image = new HtmlGraphicImage(); // String path = // facesContext.getExternalContext().getRequestContextPath(); if (dataTable.isSortAscending()) { // image.setValue(path + "/images/sortascending.gif"); image.setValue("/library/image/sakai/sortascending.gif"); image.setAlt("Sort by title ascending"); image.setTitle("Sort by title ascending"); } else { // image.setValue(path + "/images/sortdescending.gif"); image.setValue("/library/image/sakai/sortdescending.gif"); image.setAlt("Sort by title descending"); image.setTitle("Sort by title descending"); } writer.startElement(HTML.IMG_ELEM, image); writer.writeURIAttribute("src", image.getValue(), null); writer.writeAttribute("alt", image.getAlt(), null); writer.writeAttribute("title", image.getTitle(), null); writer.endElement(HTML.IMG_ELEM); } super.encodeEnd(facesContext, component); } } catch (Exception e) { log.warn("Exception occurred in HtmlSortHeaderRenderer:" + e.getMessage()); } } }