private final String v3Phase;
        private final String v4Phase;

        DefaultAlias(String v3Phase, String v4Phase) {
            this.v3Phase = v3Phase;
            this.v4Phase = v4Phase;
        }

        @Override
        public String v3Phase() {
            return v3Phase;
        }

        @Override
        public String v4Phase() {
            return v4Phase;
        }

    }

    /**
     * A phase alias, mostly used to support the Maven 3 phases which are mapped
     * to dynamic phases in Maven 4.
     */
    interface Alias {
        String v3Phase();

        String v4Phase();
    }

    /**
     * A link from a phase to another phase, consisting of a type which can be
     * {@link Kind#BEFORE} or {@link Kind#AFTER}, and a {@link Pointer} to
     * another phase.

                    Lifecycle original = phaseToLifecycleMap.put(alias.v3Phase(), lifecycle);
                    if (original != null && logger.isWarnEnabled()) {
                        logger.warn(
                                "Duplicated lifecycle phase {}. Defined in {} but also in {}",
                                alias.v3Phase(),
                                original.getId(),