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package com.sun.faces.facelets.impl;

import javax.faces.context.FacesContext;

import com.sun.faces.util.Util;

/**
 * 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();

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

    IdMapper() {
    }

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

    public String getAliasedId(String id) {
        return "R" + 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));
    }
}
