*/
public class Lifecycle {
    public Lifecycle() {}

    public Lifecycle(String id, List<String> phases, Map<String, LifecyclePhase> defaultPhases) {
        this.id = id;
        this.phases = phases;
        this.defaultPhases = defaultPhases;
    }

    public Lifecycle(
            org.apache.maven.api.services.LifecycleRegistry registry, org.apache.maven.api.Lifecycle lifecycle) {
        this.lifecycle = lifecycle;

  xml.namespace="http://maven.apache.org/LIFECYCLE/${version}"
  xml.schemaLocation="http://maven.apache.org/xsd/lifecycle-${version}.xsd">
  <id>lifecycle</id>
  <name>Lifecycle</name>
  <description>
    Configuration of custom lifecycle mappings for the plugin, as generally stored in
    {@code META-INF/maven/lifecycle.xml} in a plugin's jar artifact.
  </description>
  <classes>

    String BEFORE = "before:";
    String AFTER = "after:";
    String AT = "at:";

    /**
     * Name or identifier of this lifecycle.
     *
     * @return the unique identifier for this lifecycle
     */
    @Override
    String id();

    /**
     * Collection of phases for this lifecycle
     */
    Collection<Phase> phases();

    /**
     * Stream of phases containing all child phases recursively.
     */

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugin.lifecycle;

/**
 *
 *         A custom lifecycle mapping definition.
 *
 *
 * @version $Revision$ $Date$
 */
@SuppressWarnings("all")
public class Lifecycle implements java.io.Serializable {

    // --------------------------/
    // - Class/Member Variables -/

)

// LifecycleSys - Bucket lifecycle subsystem.
type LifecycleSys struct{}

// Get - gets lifecycle config associated to a given bucket name.
func (sys *LifecycleSys) Get(bucketName string) (lc *lifecycle.Lifecycle, err error) {
	lc, _, err = globalBucketMetadataSys.GetLifecycleConfig(bucketName)
	return lc, err
}

// NewLifecycleSys - creates new lifecycle system.
func NewLifecycleSys() *LifecycleSys {

We have a lifecycle mapping for the packaging of *jar* below. You see that for this packaging we have a *default* lifecycle and a list of phases where each phase is a comma separated list of goals to run and they are in the form groupId:artifactId:version.

<configuration>
  <lifecycles>
    <lifecycle>
      <id>default</id>
      <phases>
        <process-resources>org.apache.maven.plugins:maven-resources-plugin:resources</process-resources>

        // so that they don't interfere with internally defined lifecycles.

        Map<String, Lifecycle> phaseToLifecycleMap = new HashMap<>();

        for (Lifecycle lifecycle : getLifeCycles()) {
            for (String phase : lifecycle.getPhases()) {
                // The first definition wins.
                Lifecycle original = phaseToLifecycleMap.put(phase, lifecycle);
                if (original != null && logger.isWarnEnabled()) {

    }

    static Lifecycle.Phase phase(
            String name, Lifecycle.Link link1, Lifecycle.Link link2, Lifecycle.Link link3, Lifecycle.Phase... phases) {
        return new DefaultPhase(name, Collections.emptyList(), asList(link1, link2, link3), asList(phases));
    }

    static Lifecycle.Phase phase(String name, Collection<Lifecycle.Link> links, Lifecycle.Phase... phases) {

     *
     * @param lifecycle a lifecycle object.
     */
    public void removeLifecycle(Lifecycle lifecycle) {
        getLifecycles().remove(lifecycle);
    } // -- void removeLifecycle( Lifecycle )

    /**
     * Set the lifecycles field.
     *
     * @param lifecycles a lifecycles object.
     */
    public void setLifecycles(java.util.List<Lifecycle> lifecycles) {
        this.lifecycles = lifecycles;

	case lifecycle.DeleteVersionAction, lifecycle.DeleteAction,
		lifecycle.DeleteRestoredAction, lifecycle.DeleteRestoredVersionAction,
		lifecycle.DeleteAllVersionsAction, lifecycle.DelMarkerDeleteAllVersionsAction:
		success = applyExpiryRule(event, src, obj)
	case lifecycle.TransitionAction, lifecycle.TransitionVersionAction:
		success = applyTransitionRule(event, src, obj)
	}
	return
}