/*
* $Id: AttributeTag.java,v 1.19 2007/04/27 22:00:11 ofung Exp $
*/
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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;
}
}