if (lookup == null) {
            return customLifecycles != null ? customLifecycles : new HashMap<>();
        }

        // Lifecycles cannot be cached as extensions might add custom lifecycles later in the execution.
        try {
            Map<String, Lifecycle> lifecycles = new HashMap<>(lookup.lookupMap(Lifecycle.class));
            for (org.apache.maven.api.Lifecycle lf : registry) {

            if (allProjects != null) {
                Map<String, Map<String, Map<String, MavenProject>>> map = new HashMap<>();
                allProjects.forEach(project -> map.computeIfAbsent(project.getGroupId(), k -> new HashMap<>())
                        .computeIfAbsent(project.getArtifactId(), k -> new HashMap<>())
                        .put(project.getVersion(), project));
                this.allProjects = map;

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

import java.nio.file.Path;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.api.Artifact;
import org.apache.maven.api.ArtifactCoordinate;
import org.apache.maven.api.di.Named;
import org.apache.maven.api.di.Singleton;

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.impl.model;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

class Graph {

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.impl.resolver;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.api.Language;
import org.apache.maven.api.model.DependencyManagement;

    private List<Profile> activeExternalProfiles;

    private List<ModelProblem> problems;

    DefaultModelBuilderResult() {
        modelIds = new ArrayList<>();
        rawModels = new HashMap<>();
        activePomProfiles = new HashMap<>();
        activeExternalProfiles = new ArrayList<>();
        problems = new ArrayList<>();
    }

    DefaultModelBuilderResult(ModelBuilderResult result) {
        this();

     */
    private final Map<Path, PathType> pathTypes;

    /**
     * Creates an initially empty cache.
     */
    PathModularizationCache() {
        moduleInfo = new HashMap<>();
        pathTypes = new HashMap<>();
    }

    /**
     * Gets module information for the given JAR file or output directory.
     * Module descriptors are read when first requested, then cached.
     */

        }
        return namedLockFactories;
    }

    protected Map<String, NamedLockFactory> createNamedLockFactories() {
        HashMap<String, NamedLockFactory> result = new HashMap<>();
        result.put(NoopNamedLockFactory.NAME, new NoopNamedLockFactory());
        result.put(LocalReadWriteLockNamedLockFactory.NAME, new LocalReadWriteLockNamedLockFactory());

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.impl.resolver.type;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.apache.maven.api.JavaPathType;
import org.apache.maven.api.Language;
import org.apache.maven.api.PathType;

            return systemProperties;
        }

        @Override
        public Map<String, String> getEffectiveProperties(Project project) {
            HashMap<String, String> result = new HashMap<>(getSystemProperties());
            if (project != null) {
                result.putAll(project.getModel().getProperties());
            }
            result.putAll(getUserProperties());