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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.
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/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.facelets.el;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import com.sun.faces.facelets.util.ReflectionUtil;

import jakarta.el.FunctionMapper;

/**
 * Default implementation of the FunctionMapper
 *
 * @author Jacob Hookom
 * @version $Id$
 * @see java.lang.reflect.Method
 * @see jakarta.el.FunctionMapper
 */
public final class DefaultFunctionMapper extends FunctionMapper implements Externalizable {

    private static final long serialVersionUID = 1L;

    private Map functions = null;

    /*
     * (non-Javadoc)
     *
     * @see jakarta.el.FunctionMapper#resolveFunction(java.lang.String, java.lang.String)
     */
    @Override
    public Method resolveFunction(String prefix, String localName) {
        if (functions != null) {
            Function f = (Function) functions.get(prefix + ':' + localName);
            return f.getMethod();
        }
        return null;
    }

    public void addFunction(String prefix, String localName, Method m) {
        if (functions == null) {
            functions = new HashMap();
        }
        Function f = new Function(prefix, localName, m);
        synchronized (this) {
            functions.put(prefix + ':' + localName, f);
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput)
     */
    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeObject(functions);
    }

    /*
     * (non-Javadoc)
     *
     * @see java.io.Externalizable#readExternal(java.io.ObjectInput)
     */
    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        functions = (Map) in.readObject();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(128);
        sb.append("FunctionMapper[\n");
        for (Iterator itr = functions.values().iterator(); itr.hasNext();) {
            sb.append(itr.next()).append('\n');
        }
        sb.append(']');
        return sb.toString();
    }

    private static class Function implements Externalizable {

        private static final long serialVersionUID = 1L;

        protected transient Method m;

        protected String owner;

        protected String name;

        protected String[] types;

        protected String prefix;

        protected String localName;

        /**
         *
         */
        public Function(String prefix, String localName, Method m) {
            if (localName == null) {
                throw new NullPointerException("LocalName cannot be null");
            }
            if (m == null) {
                throw new NullPointerException("Method cannot be null");
            }
            this.prefix = prefix;
            this.localName = localName;
            this.m = m;
        }

        public Function() {
            // for serialization
        }

        /*
         * (non-Javadoc)
         *
         * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput)
         */
        @Override
        public void writeExternal(ObjectOutput out) throws IOException {
            out.writeUTF(prefix != null ? prefix : "");
            out.writeUTF(localName);
            out.writeUTF(m.getDeclaringClass().getName());
            out.writeUTF(m.getName());
            out.writeObject(ReflectionUtil.toTypeNameArray(m.getParameterTypes()));
        }

        /*
         * (non-Javadoc)
         *
         * @see java.io.Externalizable#readExternal(java.io.ObjectInput)
         */
        @Override
        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {

            prefix = in.readUTF();
            if ("".equals(prefix)) {
                prefix = null;
            }
            localName = in.readUTF();
            owner = in.readUTF();
            name = in.readUTF();
            types = (String[]) in.readObject();
        }

        public Method getMethod() {
            if (m == null) {
                try {
                    Class t = ReflectionUtil.forName(owner);
                    Class[] p = ReflectionUtil.toTypeArray(types);
                    m = t.getMethod(name, p);
                } catch (ClassNotFoundException | NoSuchMethodException | SecurityException e) {
                    e.printStackTrace();
                }
            }
            return m;
        }

        public boolean matches(String prefix, String localName) {
            if (this.prefix != null) {
                if (prefix == null) {
                    return false;
                }
                if (!this.prefix.equals(prefix)) {
                    return false;
                }
            }
            return this.localName.equals(localName);
        }

        /*
         * (non-Javadoc)
         *
         * @see java.lang.Object#equals(java.lang.Object)
         */
        @Override
        public boolean equals(Object obj) {
            if (obj instanceof Function) {
                return hashCode() == obj.hashCode();
            }
            return false;
        }

        /*
         * (non-Javadoc)
         *
         * @see java.lang.Object#hashCode()
         */
        @Override
        public int hashCode() {
            return (prefix + localName).hashCode();
        }

        @Override
        public String toString() {
            StringBuilder sb = new StringBuilder(32);
            sb.append("Function[");
            if (prefix != null) {
                sb.append(prefix).append(':');
            }
            sb.append(name).append("] ");
            sb.append(m);
            return sb.toString();
        }
    }
}