*
     * @return the collection of phases in Maven 3 compatible ordering
     */
    default Collection<Phase> v3phases() {
        return phases();
    }

    /**
     * Stream of phases containing all child phases recursively.
     *
     * @return a stream of all phases in this lifecycle, including nested phases
     */
    default Stream<Phase> allPhases() {
        return phases().stream().flatMap(Phase::allPhases);
    }

                            @Override
                            public List<Plugin> plugins() {
                                Map<String, LifecyclePhase> lfPhases = lifecycle.getDefaultLifecyclePhases();
                                LifecyclePhase phase = lfPhases != null ? lfPhases.get(name) : null;
                                if (phase != null) {
                                    Map<String, Plugin> plugins = new LinkedHashMap<>();

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

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

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

                    .filter(a -> phase.equals(a.v3Phase()))
                    .findFirst()
                    .map(Lifecycle.Alias::v4Phase)
                    .orElse(phase);
        }

        private String getResolvedPhase(String phase) {
            return lifecycles.stream()
                    .flatMap(l -> l.aliases().stream())
                    .filter(a -> phase.equals(a.v3Phase()))
                    .findFirst()

        Map<String, String> aliases = lifecycle.getDelegate().aliases().stream()
                .collect(Collectors.toMap(a -> a.v3Phase(), a -> a.v4Phase()));

        if (aliases.containsKey(lifecyclePhase)) {
            lifecyclePhase = PhaseId.of(aliases.get(lifecyclePhase)).phase();
        }

        boolean passed = false;
        for (String phase : lifecycle.getPhases()) {
            boolean include = true;

        Map<String, LifecyclePhase> lphases = getLifecyclePhases();
        if (lphases == null) {
            return null;
        }

        if (lphases.isEmpty()) {
            return Collections.emptyMap();
        }

        Map<String, String> phases = new LinkedHashMap<>();
        for (Map.Entry<String, LifecyclePhase> e : lphases.entrySet()) {
            phases.put(e.getKey(), e.getValue().toString());
        }

                    .flatMap(l -> l.getDelegate().aliases().stream())
                    .filter(a -> phase.getId().equals(a.v3Phase()))
                    .findFirst()
                    .map(a -> a.v4Phase())
                    .orElse(phase.getId());

            List<MojoExecution> forkedExecutions = lifecycleMappings.get(phaseId);

            if (forkedExecutions != null) {

                    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(),

        this.id = lifecycle.id();
        this.phases = registry.computePhases(lifecycle);
        this.defaultPhases = getDefaultPhases(lifecycle);
    }

    // <lifecycle>
    //   <id>clean</id>
    //   <phases>
    //     <phase>pre-clean</phase>
    //     <phase>clean</phase>
    //     <phase>post-clean</phase>
    //   </phases>
    //   <default-phases>

        this.id = id;
    } // -- void setId( String )

    /**
     * Set the phase mappings for this lifecycle.
     *
     * @param phases a phases object.
     */
    public void setPhases(java.util.List<Phase> phases) {
        this.phases = phases;
    } // -- void setPhases( java.util.List )