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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.2.20
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package com.sun.faces.facelets.tag.composite;

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

import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.*;
import java.beans.BeanDescriptor;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


public class DeclareFacetHandler extends TagHandlerImpl {

    private static final String[] ATTRIBUTES = {
          "required",
          "displayName",
          "expert",
          "hidden",
          "preferred",
          "shortDescription",
          "default"
    };

    private static final PropertyHandlerManager ATTRIBUTE_MANAGER =
          PropertyHandlerManager.getInstance(ATTRIBUTES);

    private TagAttribute name = null;



    public DeclareFacetHandler(TagConfig config) {
        super(config);
        this.name = this.getRequiredAttribute("name");

        
    }
    
    @SuppressWarnings({"unchecked"})
    public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
        // only process if it's been created
        if (null == parent || 
            (null == (parent = parent.getParent())) ||
            !(ComponentHandler.isNew(parent))) {
            return;
        }
        
        Map componentAttrs = parent.getAttributes();

        CompositeComponentBeanInfo componentBeanInfo = (CompositeComponentBeanInfo)
                componentAttrs.get(UIComponent.BEANINFO_KEY);

        // Get the value of required the name propertyDescriptor
        ValueExpression ve = name.getValueExpression(ctx, String.class);
        String strValue = (String) ve.getValue(ctx);
        BeanDescriptor componentBeanDescriptor = componentBeanInfo.getBeanDescriptor();
        
        Map facetDescriptors = (Map) 
                   componentBeanDescriptor.getValue(UIComponent.FACETS_KEY);
        
        if (facetDescriptors == null) {
            facetDescriptors = new HashMap();
            componentBeanDescriptor.setValue(UIComponent.FACETS_KEY, 
                    facetDescriptors);
        }

        PropertyDescriptor propertyDescriptor;
        try {
            propertyDescriptor = new PropertyDescriptor(strValue, null, null);
        } catch (IntrospectionException ex) {
            throw new  TagException(tag, "Unable to create property descriptor for facet" + strValue, ex);
        }
        facetDescriptors.put(strValue, propertyDescriptor);
        
        for (TagAttribute tagAttribute : this.tag.getAttributes().getAll()) {
            String attributeName = tagAttribute.getLocalName();
            PropertyHandler handler = ATTRIBUTE_MANAGER.getHandler(ctx, attributeName);
            if (handler != null) {
                handler.apply(ctx, attributeName, propertyDescriptor, tagAttribute);
            }

        }
        
        this.nextHandler.apply(ctx, parent);
        
    }

}