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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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package com.sun.faces.facelets.tag.jsf.core;

import com.sun.faces.facelets.tag.TagHandlerImpl;
import com.sun.faces.facelets.tag.jsf.CompositeComponentTagHandler;

import javax.faces.application.Resource;
import javax.faces.component.ActionSource;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.view.ActionSource2AttachedObjectHandler;
import javax.faces.view.facelets.*;
import java.io.IOException;

/**
 * Register an ActionListener instance on the UIComponent associated with the
 * closest parent UIComponent custom action.  See tag
 * documentation.
 *
 * @author Jacob Hookom
 * @see javax.faces.event.ActionListener
 * @see javax.faces.component.ActionSource
 */
public abstract class ActionListenerHandlerBase extends TagHandlerImpl
      implements ActionSource2AttachedObjectHandler {

    /**
     * @param config
     */
    public ActionListenerHandlerBase(TagConfig config) {
        super(config);
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext,
     *      javax.faces.component.UIComponent)
     */
    public void apply(FaceletContext ctx, UIComponent parent)
          throws IOException {
        if (null == parent || !(ComponentHandler.isNew(parent))) {
            return;
        }

        if (parent instanceof ActionSource) {
            applyAttachedObject(ctx.getFacesContext(), parent);
        } else if (parent.getAttributes()
              .containsKey(Resource.COMPONENT_RESOURCE_KEY)) {
            if (null == getFor()) {
                // PENDING(): I18N
                throw new TagException(this.tag,
                                       "actionListener tags nested within composite components must have a non-null \"for\" attribute");
            }
            // Allow the composite component to know about the target
            // component.
            CompositeComponentTagHandler.getAttachedObjectHandlers(parent)
                  .add(this);

        } else {
            throw new TagException(this.tag,
                                   "Parent is not of type ActionSource, type is: "
                                   + parent);
        }
    }

    public abstract void applyAttachedObject(FacesContext context, UIComponent parent);


    public String getFor() {
        String result = null;
        TagAttribute attr = this.getAttribute("for");

        if (null != attr) {
            if (attr.isLiteral()) {
                result = attr.getValue();
            } else {
                FacesContext context = FacesContext.getCurrentInstance();
                FaceletContext ctx = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
                result = (String)attr.getValueExpression(ctx, String.class).getValue(ctx);
            }
        }
        return result;

    }

}