com.sun.faces.facelets.impl.IdMapper Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jakarta.faces Show documentation
EE4J Compatible Implementation for Jakarta Faces API
The newest version!
/*
 * 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.impl;

import java.util.concurrent.atomic.AtomicInteger;

import com.sun.faces.util.Cache;
import com.sun.faces.util.Util;

import jakarta.faces.context.FacesContext;

/**
 * Used to provide aliases to Facelets generated unique IDs with tend to be womewhat long.
 */
public class IdMapper {

    private static final String KEY = IdMapper.class.getName();

    private Cache idCache = new Cache<>(new IdGen());

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

    IdMapper() {
    }

    // ---------------------------------------------------------- Public Methods

    public String getAliasedId(String id) {

        return idCache.get(id);

    }

    public static void setMapper(FacesContext ctx, IdMapper mapper) {

        Util.notNull("ctx", ctx);
        if (mapper == null) {
            ctx.getAttributes().remove(KEY);
        } else {
            ctx.getAttributes().put(KEY, mapper);
        }

    }

    public static IdMapper getMapper(FacesContext ctx) {

        Util.notNull("ctx", ctx);
        return (IdMapper) ctx.getAttributes().get(KEY);

    }

    // ---------------------------------------------------------- Nested Classes

    private static final class IdGen implements Cache.Factory {

        private AtomicInteger counter = new AtomicInteger(0);

        // ------------------------------------------ Methods from Cache.Factory

        @Override
        public String newInstance(String arg) throws InterruptedException {

            return 't' + Integer.toString(counter.incrementAndGet());

        }

    }
}