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* and Distribution License("CDDL") (collectively, the "License"). You
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package com.sun.webui.jsf.renderkit.widget;
import com.sun.webui.jsf.component.Widget;
import com.sun.webui.theme.Theme;
import com.sun.webui.jsf.util.JavaScriptUtilities;
import com.sun.webui.jsf.util.ThemeUtilities;
import java.io.IOException;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* This class provides common methods for widget renderers.
*
* Renderers extending this class are expected to output JSON containing
* key-value pairs of component properties. The JSON object given to the widget
* may contain further key-value pairs of properties or an HTML string. This
* base class shall ensure that all properties are obtained and rendered at the
* appropriate time.
*/
abstract public class RendererBase extends Renderer {
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Renderer methods
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Render the beginning of the specified UIComponent to the output stream or
* writer associated with the response we are creating.
*
* Note: This method is used to gather component properties and JavaScript
* includes. The actual rendering is defered to the encodeEnd method. This
* helps ensure that default properties and JavaScript includes have been
* gathered from all subcomponents. Thus, default properties are rendered
* using a single script tag and JavaScript includes are rendered before
* any widgets are instantiated.
*
* @param context FacesContext for the current request.
* @param component UIComponent to be rendered.
*
* @exception IOException if an input/output error occurs.
* @exception NullPointerException if context or component is null.
*/
@Override
public void encodeBegin(FacesContext context, UIComponent component)
throws IOException {
// Do nothing...
}
/**
* Render the children of the specified UIComponent to the output stream or
* writer associated with the response we are creating.
*
* @param context FacesContext for the current request.
* @param component UIComponent to be rendered.
*
* @exception IOException if an input/output error occurs.
* @exception NullPointerException if context or component is null.
*/
@Override
public void encodeChildren(FacesContext context, UIComponent component)
throws IOException {
// Do nothing... Children are rendered when obtaining component
// properties via the encodeBegin method.
}
/**
* Render the ending of the specified UIComponent to the output stream or
* writer associated with the response we are creating.
*
* Note: This method is used to render JSON properties. If the component
* does not have a parent of type Widget, JavaScript is also rendered to
* instantiate a Dojo widget. JavaScript includes and default properties
* are only rendered if and only if the component does not have an ancestor
* of type Widget. Thus, this ensures that default properties are rendered
* using a single script tag and JavaScript includes are rendered before
* any widgets are instantiated.
*
* @param context FacesContext for the current request.
* @param component UIComponent to be rendered.
*
* @exception IOException if an input/output error occurs.
* @exception NullPointerException if context or component is null.
*/
@Override
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException {
if (context == null || component == null) {
throw new NullPointerException();
}
if (!component.isRendered()) {
return;
}
// Get writer.
ResponseWriter writer = context.getResponseWriter();
String widgetType = ((Widget) component).getWidgetType();
boolean isSubComponent = component.getParent() instanceof Widget;
// Render for JSF facets, but not subcomponents.
if (!isSubComponent && widgetType != null) {
// Render temporary place holder to position widget in page --
// ultimately replaced by document fragment.
writer.startElement("span", component);
writer.writeAttribute("id", component.getClientId(context), null);
writer.endElement("span");
// Render enclosing tag -- must be located after div.
writer.write("\n");
writer.startElement("script", component);
writer.writeAttribute("type", "text/javascript", null);
writer.write("\n");
// Render JavaScript to instantiate Dojo widget.
writer.write(JavaScriptUtilities.getModule("widget.*"));
writer.write("\n");
writer.write(JavaScriptUtilities.getModuleName(
"widget.common.createWidget"));
writer.write("(");
}
try {
// Always render properties.
writer.write(getProperties(context, component).toString(
JavaScriptUtilities.INDENT_FACTOR));
} catch (JSONException e) {
e.printStackTrace();
}
// Render for JSF facets, but not subcomponents.
if (!isSubComponent && widgetType != null) {
// Render enclosing tag.
writer.write(");\n");
writer.endElement("script");
writer.write("\n");
}
}
/**
* Return a flag indicating whether this Renderer is responsible
* for rendering the children the component it is asked to render.
* The default implementation returns false.
*/
@Override
public boolean getRendersChildren() {
return true;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Property methods
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* This method may be used to add attribute name/value pairs to the given
* JSONObject.
*
* @param names Array of attribute names to be passed through.
* @param component UIComponent to be rendered.
* @param json JSONObject to add name/value pairs to.
*
* @exception IOException if an input/output error occurs
*/
protected void addAttributeProperties(String names[], UIComponent component,
JSONObject json) throws JSONException {
if (names == null) {
return;
}
Map attributes = component.getAttributes();
for (int i = 0; i < names.length; i++) {
Object value = attributes.get(names[i]);
if (value != null && value instanceof Integer) {
if (((Integer) value).intValue() == Integer.MIN_VALUE) {
continue;
}
}
json.put(names[i], value);
}
}
/**
* Get the Dojo modules required to instantiate the widget.
*
* @param context FacesContext for the current request.
* @param component UIComponent to be rendered.
*/
abstract protected JSONArray getModules(FacesContext context,
UIComponent component) throws JSONException;
/**
* Helper method to obtain component properties.
*
* @param context FacesContext for the current request.
* @param component UIComponent to be rendered.
*/
abstract protected JSONObject getProperties(FacesContext context,
UIComponent component) throws IOException, JSONException;
/**
* This method may be used to set core name/value pairs for the given
* JSONObject.
*
* @param context FacesContext for the current request.
* @param component UIComponent to be rendered.
* @param json JSONObject to add name/value pairs to.
*
* @exception IOException if an input/output error occurs
*/
protected void setCoreProperties(FacesContext context, UIComponent component,
JSONObject json) throws JSONException {
json.put("id", component.getClientId(context)).put("_modules", getModules(context, component)).put("_widgetType", ((Widget) component).getWidgetType());
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Private methods
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Helper method to get Theme objects.
private Theme getTheme() {
return ThemeUtilities.getTheme(FacesContext.getCurrentInstance());
}
}
