com.sun.faces.renderkit.html_basic.LabelRenderer Maven / Gradle / Ivy
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// LabelRenderer.java
package com.sun.faces.renderkit.html_basic;
import java.io.IOException;
import java.util.logging.Level;
import javax.faces.component.NamingContainer;
import javax.faces.component.UIComponent;
import javax.faces.component.UINamingContainer;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import com.sun.faces.renderkit.Attribute;
import com.sun.faces.renderkit.AttributeManager;
import com.sun.faces.renderkit.RenderKitUtils;
import java.util.EnumSet;
import java.util.Set;
import javax.faces.component.search.SearchExpressionContext;
import javax.faces.component.search.SearchExpressionHint;
/** LabelRenderer renders Label element.
. */
public class LabelRenderer extends HtmlBasicInputRenderer {
private static final Attribute[] ATTRIBUTES =
AttributeManager.getAttributes(AttributeManager.Key.OUTPUTLABEL);
private static final String RENDER_END_ELEMENT =
"com.sun.faces.RENDER_END_ELEMENT";
// ---------------------------------------------------------- Public Methods
private static final Set EXPRESSION_HINTS =
EnumSet.of(SearchExpressionHint.RESOLVE_SINGLE_COMPONENT, SearchExpressionHint.IGNORE_NO_RESULT);
@Override
public void encodeBegin(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
ResponseWriter writer = context.getResponseWriter();
assert(writer != null);
String forClientId = null;
String forValue = (String) component.getAttributes().get("for");
if (forValue != null) {
SearchExpressionContext searchExpressionContext =
SearchExpressionContext.createSearchExpressionContext(context, component,
EXPRESSION_HINTS, null);
forClientId = context.getApplication().getSearchExpressionHandler().resolveClientId(
searchExpressionContext, forValue);
if (forClientId == null) {
// it could that the component hasn't been created yet. So
// construct the clientId for component.
forClientId = getForComponentClientId(component, context, forValue);
}
}
// set a temporary attribute on the component to indicate that
// label end element needs to be rendered.
component.getAttributes().put(RENDER_END_ELEMENT, "yes");
writer.startElement("label", component);
writeIdAttributeIfNecessary(context, writer, component);
if (forClientId != null) {
writer.writeAttribute("for", forClientId, "for");
}
RenderKitUtils.renderPassThruAttributes(context,
writer,
component,
ATTRIBUTES);
String styleClass = (String)
component.getAttributes().get("styleClass");
if (null != styleClass) {
writer.writeAttribute("class", styleClass, "styleClass");
}
// render the curentValue as label text if specified.
String value = getCurrentValue(context, component);
if (logger.isLoggable(Level.FINE)) {
logger.fine("Value to be rendered " + value);
}
if (value != null && value.length() != 0) {
Object val = component.getAttributes().get("escape");
boolean escape = (val != null) && Boolean.valueOf(val.toString());
if (escape) {
writer.writeText(value, component, "value");
} else {
writer.write(value);
}
}
writer.flush();
}
@Override
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
// render label end element if RENDER_END_ELEMENT is set.
String render = (String) component.getAttributes().get(
RENDER_END_ELEMENT);
if ("yes".equals(render)) {
component.getAttributes().remove(RENDER_END_ELEMENT);
ResponseWriter writer = context.getResponseWriter();
assert(writer != null);
writer.endElement("label");
}
}
// ------------------------------------------------------- Private Methods
/**
* Builds and returns the clientId of the component that is
* represented by the forValue. Since the component has not been created
* yet, invoking getClientId(context) is not possible.
*
* @param component UIComponent that represents the label
* @param context FacesContext for this request
* @param forValue String representing the "id" of the component
* that this label represents.
*
* @return String clientId of the component represented by the forValue.
*/
protected String getForComponentClientId(UIComponent component,
FacesContext context,
String forValue) {
String result = null;
// ASSUMPTION: The component for which this acts as the label
// as well ths label component are part of the same form.
// locate the nearest NamingContainer and get its clientId.
UIComponent parent = component.getParent();
while (parent != null) {
if (parent instanceof NamingContainer) {
break;
}
parent = parent.getParent();
}
if (parent == null) {
return result;
}
String parentClientId = parent.getClientId(context);
// prepend the clientId of the nearest container to the forValue.
result = parentClientId + UINamingContainer.getSeparatorChar(context) + forValue;
return result;
}
// The testcase for this class is TestRenderResponsePhase.java
} // end of class LabelRenderer