jsf核心编程源码

package com.corejsf; import java.io.IOException; import java.util.Map; import java.util.logging.Level; import java.util.logging.Logger; import javax.faces.component.UIComponent; import javax.faces.context.ExternalContext; import javax.faces.context.FacesContext; import javax.faces.context.ResponseWriter; import javax.faces.event.ActionEvent; import javax.faces.model.SelectItem; import javax.faces.render.Renderer; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; // Renderer for the UITabbedPane component public class TabbedPaneRenderer extends Renderer { private static Logger logger = Logger.getLogger("com.corejsf.util"); // By default, getRendersChildren() returns false, so encodeChildren() // won't be invoked unless we override getRendersChildren() to return true public boolean getRendersChildren() { return true; } // The decode method gets the value of the request parameter whose name // is the client Id of the tabbedpane component. The request parameter // is encoded as a hidden field by encodeHiddenField, which is called by // encodeEnd. The value for the parameter is set by JavaScript generated // by the encodeTab method. It is the name of a facet or a JSP page. // The decode method uses the request parameter value to set the // tabbedpane component's content attribute. // Finally, decode() queues an action event that's fired to registered // listeners in the Invoke Application phase of the JSF lifecycle. Action // listeners can be specified with the <corejsf:tabbedpane>'s actionListener // attribute or with <f:actionListener> tags in the body of the // <corejsf:tabbedpane> tag. public void decode(FacesContext context, UIComponent component) { Map<String, String> requestParams = context.getExternalContext().getRequestParameterMap(); String clientId = component.getClientId(context); String content = (String) (requestParams.get(clientId)); if (content != null && !content.equals("")) { UITabbedPane tabbedPane = (UITabbedPane) component; tabbedPane.setContent(content); } component.queueEvent(new ActionEvent(component)); } // The encodeBegin method writes the starting <table> HTML element // with the CSS class specified by the <corejsf:tabbedpane>'s styleClass // attribute (if supplied) public void encodeBegin(FacesContext context, UIComponent component) throws java.io.IOException { ResponseWriter writer = context.getResponseWriter(); writer.startElement("table", component); String styleClass = (String) component.getAttributes().get("styleClass"); if (styleClass != null) writer.writeAttribute("class", styleClass, null); writer.write("\n"); // to make generated HTML easier to read } // encodeChildren() is invoked by the JSF implementation after encodeBegin(). // The children of the <corejsf:tabbedpane> component are UISelectItem // components, set with one or more <f:selectItem> tags or a single // <f:selectItems> tag in the body of <corejsf:tabbedpane> public void encodeChildren(FacesContext context, UIComponent component) throws java.io.IOException { // if the tabbedpane component has no children, this method is still // called if (component.getChildCount() == 0) { return; } ResponseWriter writer = context.getResponseWriter(); writer.startElement("thead", component); writer.startElement("tr", component); writer.startElement("th", component); writer.startElement("table", component); writer.startElement("tbody", component); writer.startElement("tr", component); for (SelectItem item : com.corejsf.util.Renderers.getSelectItems(component)) encodeTab(context, writer, item, component); writer.endElement("tr"); writer.endElement("tbody"); writer.endElement("table"); writer.endElement("th"); writer.endElement("tr"); writer.endElement("thead"); writer.write("\n"); // to make generated HTML easier to read } // encodeEnd() is invoked by the JSF implementation after encodeChildren(). // encodeEnd() writes the table body and encodes the tabbedpane's content // in a single table row. // The content for the tabbed pane can be specified as either a URL for // a JSP page or a facet name, so encodeEnd() checks to see if it's a facet; // if so, it encodes it; if not, it includes the JSP page public void encodeEnd(FacesContext context, UIComponent component) throws java.io.IOException { ResponseWriter writer = context.getResponseWriter(); UITabbedPane tabbedPane = (UITabbedPane) component; String content = tabbedPane.getContent(); writer.startElement("tbody", component); writer.startElement("tr", component); writer.startElement("td", component); if (content != null) { UIComponent facet = component.getFacet(content); if (facet != null) { if (facet.isRendered()) { facet.encodeBegin(context); if (facet.getRendersChildren()) facet.encodeChildren(context); facet.encodeEnd(context); } } else includePage(context, component); } writer.endElement("td"); writer.endElement("tr"); writer.endElement("tbody"); // Close off the column, row, and table elements writer.endElement("table"); encodeHiddenField(context, writer, component); } // The encodeHiddenField method is called at the end of encodeEnd(). // See the decode method for an explanation of the field and its value. private void encodeHiddenField(FacesContext context, ResponseWriter writer, UIComponent component) throws java.io.IOException { // write hidden field whose name is the tabbedpane's client Id writer.startElement("input", component); writer.writeAttribute("type", "hidden", null); writer.writeAttribute("name", component.getClientId(context), null); writer.endElement("input"); } // encodeTab, which is called by encodeChildren, encodes an HTML anchor // element with an onclick attribute which sets the value of the hidden // field encoded by encodeHiddenField and submits the tabbedpane's enclosing // form. See the decode method for more information about the hidden field. // encodeTab also writes out a class attribute for each tab corresponding // to either the tabClass attribute (for unselected tabs) or the // selectedTabClass attribute (for the selected tab). private void encodeTab(FacesContext context, ResponseWriter writer, SelectItem item, UIComponent component) throws java.io.IOException { String tabText = getLocalizedTabText(component, item.getLabel()); String content = (String) item.getValue(); writer.startElement("td", component); writer.startElement("a", component); writer.writeAttribute("href", "#", "href"); String clientId = component.getClientId(context); String formId = com.corejsf.util.Renderers.getFormId(context, component); writer.writeAttribute("onclick", // write value for hidden field whose name is the tabbedpane's client Id "document.forms['" + formId + "']['" + clientId + "'].value='" + content + "'; " + // submit form in which the tabbedpane resides "document.forms['" + formId + "'].submit(); ", null); UITabbedPane tabbedPane = (UITabbedPane) component; String selectedContent = tabbedPane.getContent(); String tabClass = null; if (content.equals(selectedContent)) tabClass = (String) component.getAttributes().get("selectedTabClass")