com.sun.faces.facelets.impl.IdMapper Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2018 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 com.sun.faces.util.Cache;
import com.sun.faces.util.Util;
import javax.faces.context.FacesContext;
import java.util.concurrent.atomic.AtomicInteger;
/**
* 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());
}
}
}