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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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package com.sun.faces.facelets.util;

import com.sun.faces.facelets.tag.TagLibrary;
import com.sun.faces.util.Util;

import javax.faces.FacesException;
import javax.faces.view.facelets.Tag;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

/**
 * This TagLibrary exposes the public static
 * methods defined on the functionsClass provided to the constructor
 * as EL functions.
 */
public class FunctionLibrary implements TagLibrary {
    
    public final static String Namespace = "http://java.sun.com/jsp/jstl/functions";
    public final static String XMLNSNamespace = "http://xmlns.jcp.org/jsp/jstl/functions";
    

    private String _namespace;
    private Map functions;

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


    public FunctionLibrary(Class functionsClass, String namespace) {

        Util.notNull("functionsClass", functionsClass);
        Util.notNull("namespace", namespace);

        this._namespace = namespace;

        try {
            Method[] methods = functionsClass.getMethods();
            functions = new HashMap(methods.length, 1.0f);
            for (Method method : methods) {
                if (Modifier.isStatic(method.getModifiers())
                    && Modifier.isPublic(method.getModifiers())) {
                    functions.put(method.getName(), method);
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    // ------------------------------------------------- Methods from TagLibrary

    public boolean containsNamespace(String ns, Tag t) {
        return _namespace.equals(ns);
    }

    public boolean containsTagHandler(String ns, String localName) {
        return false;
    }

    public TagHandler createTagHandler(String ns, String localName,
            TagConfig tag) throws FacesException {
        return null;
    }

    public boolean containsFunction(String ns, String name) {
        return _namespace.equals(ns) && this.functions.containsKey(name);
    }

    public Method createFunction(String ns, String name) {
        if (_namespace.equals(ns)) {
            return this.functions.get(name);
        }
        return null;
    }
    
}