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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.composite;

import javax.faces.component.UIComponent;
import javax.faces.view.facelets.*;
import java.util.Map;


public class RenderFacetHandler extends ComponentHandler {

    // Supported attribute names
    private static final String NAME_ATTRIBUTE = "name";
    private static final String REQUIRED_ATTRIBUTE = "required";

    // Attributes

    // This attribute is required.
    TagAttribute name;

    // This attribute is not required.  If not defined, then assume the facet
    // isn't necessary.
    TagAttribute required;


    // ------------------------------------------------------------ Constructors


    public RenderFacetHandler(ComponentConfig config) {
        super(config);
        name = this.getRequiredAttribute(NAME_ATTRIBUTE);
        required = this.getAttribute(REQUIRED_ATTRIBUTE);
    }


    // ------------------------------------------------- Methods from TagHandler


    @Override
    public void onComponentPopulated(FaceletContext ctx, UIComponent c, UIComponent parent) {

        UIComponent compositeParent =
              UIComponent.getCurrentCompositeComponent(ctx.getFacesContext());
        if (compositeParent == null) {
            return;
        }
        boolean requiredValue =
              ((this.required != null) && this.required.getBoolean(ctx));
        String nameValue = this.name.getValue(ctx);

        if (compositeParent.getFacetCount() == 0 && requiredValue) {
            throwRequiredException(ctx, nameValue, compositeParent);
        }

        Map facetMap = compositeParent.getFacets();
        c.getAttributes().put(UIComponent.FACETS_KEY, nameValue);
        if (requiredValue && !facetMap.containsKey(nameValue)) {
            throwRequiredException(ctx, nameValue, compositeParent);
        }

    }


    // --------------------------------------------------------- Private Methods


    private void throwRequiredException(FaceletContext ctx,
                                        String name,
                                        UIComponent compositeParent) {

        throw new TagException(this.tag,
                               "Unable to find facet named '"
                               + name
                               + "' in parent composite component with id '"
                               + compositeParent .getClientId(ctx.getFacesContext())
                               + '\'');

    }

}