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package javax.faces.webapp;
import javax.el.
ELContext;
import javax.el.
ExpressionFactory;
import javax.faces.component.
UIComponent;
import javax.faces.context.
FacesContext;
import javax.servlet.jsp.
JspException;
import javax.servlet.jsp.tagext.
TagSupport;
/**
* <p>Tag implementation that adds an attribute with a specified name
* and String value to the component whose tag it is nested inside,
* if the component does not already contain an attribute with the
* same name. This tag creates no output to the page currently
* being created.</p>
*
* @deprecated The Faces implementation must now provide the
* implementation for this class.
*/
public class
AttributeTag extends
TagSupport {
// ---------------------------------------------------------- Static Members
private static final long
serialVersionUID = -7782950243436672334L;
// ------------------------------------------------------------- Attributes
/**
* <p>The name of the attribute to be created, if not already present.
*/
private
String name = null;
/**
* <p>Set the attribute name.</p>
*
* @param name The new attribute name
*/
public void
setName(
String name) {
this.
name =
name;
}
/**
* <p>The value to be associated with this attribute, if it is created.</p>
*/
private
String value = null;
/**
* <p>Set the attribute value.</p>
*
* @param value The new attribute value
*/
public void
setValue(
String value) {
this.
value =
value;
}
// --------------------------------------------------------- Public Methods
/**
* <p>Register the specified attribute name and value with the
* {@link UIComponent} instance associated with our most immediately
* surrounding {@link UIComponentTag} instance, if this {@link UIComponent}
* does not already have a value for the specified attribute name.</p>
*
* @throws JspException if a JSP error occurs
*/
public int
doStartTag() throws
JspException {
// Locate our parent UIComponentTag
UIComponentClassicTagBase tag =
UIComponentClassicTagBase.
getParentUIComponentClassicTagBase(
pageContext);
if (
tag == null) { // PENDING - i18n
throw new
JspException("Not nested in a UIComponentTag");
}
// Add this attribute if it is not already defined
UIComponent component =
tag.
getComponentInstance();
if (
component == null) { // PENDING - i18n
throw new
JspException("No component associated with UIComponentTag");
}
FacesContext context =
FacesContext.
getCurrentInstance();
ExpressionFactory exprFactory =
context.
getApplication().
getExpressionFactory();
ELContext elContext =
context.
getELContext();
String nameVal = (
String)
exprFactory.
createValueExpression(
elContext,
name,
String.class)
.
getValue(
elContext);
Object valueVal =
exprFactory.
createValueExpression(
elContext,
value,
Object.class)
.
getValue(
elContext);
if (
component.
getAttributes().
get(
nameVal) == null) {
component.
getAttributes().
put(
nameVal,
valueVal);
}
return (
SKIP_BODY);
}
public int
doEndTag() throws
JspException {
this.
release();
return (
EVAL_PAGE);
}
/**
* <p>Release references to any acquired resources.
*/
public void
release() {
this.
name = null;
this.
value = null;
}
}