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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<String,String> 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<String,String> {
private AtomicInteger counter = new AtomicInteger(0);
// ------------------------------------------ Methods from Cache.Factory
@Override
public String newInstance(String arg) throws InterruptedException {
return 't' + Integer.toString(counter.incrementAndGet());
}
}
}