private Map<String, Artifact> reportArtifactMap;

    private Set<Artifact> extensionArtifacts;

    private Map<String, Artifact> extensionArtifactMap;

    private Map<String, Artifact> managedVersionMap;

    private Map<String, MavenProject> projectReferences = new HashMap<>();

    private boolean executionRoot;

    private File parentFile;

    private Map<String, Object> context;

        if (request.getValidationLevel() < ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_2_0) {
            return;
        }

        Map<String, Plugin> plugins = new HashMap<>();
        Map<String, String> versions = new HashMap<>();
        Map<String, String> managedVersions = new HashMap<>();

        for (int i = lineage.size() - 1; i >= 0; i--) {
            Model model = lineage.get(i);

 * under the License.
 */
package org.apache.maven.project;

import javax.inject.Inject;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.maven.MavenTestHelper;
import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
import org.apache.maven.bridge.MavenRepositorySystem;

        throw (T) t; // rely on vacuous cast
    }

    static class LazyMap<K, V> extends AbstractMap<K, V> {
        private final Supplier<Map<K, V>> supplier;
        private volatile Map<K, V> delegate;

        LazyMap(Supplier<Map<K, V>> supplier) {
            this.supplier = supplier;
        }

        @Override
        public Set<Entry<K, V>> entrySet() {

import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.function.UnaryOperator;