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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.compiler;

import com.sun.faces.facelets.el.CompositeFunctionMapper;
import com.sun.faces.facelets.tag.TagLibrary;
import com.sun.faces.el.ELContextImpl;

import javax.el.FunctionMapper;
import javax.el.ELContext;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletHandler;
import javax.faces.context.FacesContext;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Map;

final class NamespaceHandler extends FunctionMapper implements FaceletHandler {

    private final TagLibrary library;
    private final Map ns;
    private FaceletHandler next;
    
    public NamespaceHandler(FaceletHandler next, TagLibrary library, Map ns) {
        this.library = library;
        this.ns = ns;
        this.next = next;
    }

    public void apply(FaceletContext ctx, UIComponent parent)
            throws IOException {
        FunctionMapper orig = ctx.getFunctionMapper();
        pushMapper(ctx.getFacesContext(), this);
        ctx.setFunctionMapper(new CompositeFunctionMapper(this, orig));
        try {
            next.apply(ctx, parent);
        } finally {
            ctx.setFunctionMapper(orig);
        }
    }

    public Method resolveFunction(String prefix, String localName) {
        String uri = (String) this.ns.get(prefix);
        if (uri != null) {
            return this.library.createFunction(uri, localName);
        }
        return null;
    }


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


    private void pushMapper(FacesContext ctx, FunctionMapper mapper) {

        ELContext elContext = ctx.getELContext();
        if (elContext instanceof ELContextImpl) {
            ((ELContextImpl) elContext).setFunctionMapper(mapper);
        }

    }

}