properties.put(
                MavenArtifactProperties.CONSTITUTES_BUILD_PATH,
                String.valueOf(this.pathTypes.contains(JavaPathType.CLASSES)));
        this.properties = Collections.unmodifiableMap(properties);
    }

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

    @Override
    public String getId() {
        return id();
    }

    @Override

        return list != null ? Collections.unmodifiableList(list) : Collections.emptyList();
    }

    private static Map<String, String> unmodifiable(Map<String, String> map) {
        return map != null ? Collections.unmodifiableMap(map) : Collections.emptyMap();
    }

    private static Map<String, String> toMap(Properties properties) {
        if (properties != null && !properties.isEmpty()) {
            return properties.entrySet().stream()

                        delegate.getMojoDescriptor().getPluginDescriptor().getDependencyNode();
                DefaultNode node = new DefaultNode(session, resolverNode, false);
                return Collections.unmodifiableMap(node.stream()
                        .filter(Objects::nonNull)
                        .map(Node::getDependency)
                        .filter(Objects::nonNull)

        Map<K, V> onlyOnRight,
        Map<K, V> onBoth,
        Map<K, ValueDifference<V>> differences) {
      this.onlyOnLeft = unmodifiableMap(onlyOnLeft);
      this.onlyOnRight = unmodifiableMap(onlyOnRight);
      this.onBoth = unmodifiableMap(onBoth);
      this.differences = unmodifiableMap(differences);
    }

    @Override
    public boolean areEqual() {

        Map<K, V> onlyOnRight,
        Map<K, V> onBoth,
        Map<K, ValueDifference<V>> differences) {
      this.onlyOnLeft = unmodifiableMap(onlyOnLeft);
      this.onlyOnRight = unmodifiableMap(onlyOnRight);
      this.onBoth = unmodifiableMap(onBoth);
      this.differences = unmodifiableMap(differences);
    }

    @Override
    public boolean areEqual() {

import static java.lang.Double.NEGATIVE_INFINITY;
import static java.lang.Double.NaN;
import static java.lang.Double.POSITIVE_INFINITY;
import static java.util.Arrays.sort;
import static java.util.Collections.unmodifiableMap;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.primitives.Doubles;
import com.google.common.primitives.Ints;

        } else {
            properties.setProperty(key, value);
        }
    }

    @Override
    public Map<String, String> getProperties(Project project) {
        return Collections.unmodifiableMap(
                new PropertiesAsMap(((DefaultProject) project).getProject().getProperties()));
    }

    @Override
    public Optional<Project> getExecutionProject(Project project) {

        }
        for ( Entry<String, List<String>> entry : map.entrySet() ) {
            entry.setValue(Collections.unmodifiableList(entry.getValue()));
        }
        return ( this.headerFields = Collections.unmodifiableMap(map) );
    }


    @Override
    public Map<String, List<String>> getHeaderFields () {
        if ( this.headerFields != null )
            return this.headerFields;
        handshake();

  public Map<K, Long> asMap() {
    Map<K, Long> result = asMap;
    return (result == null) ? asMap = createAsMap() : result;
  }

  private Map<K, Long> createAsMap() {
    return Collections.unmodifiableMap(map);
  }

  /** Returns true if this map contains a mapping for the specified key. */
  public boolean containsKey(Object key) {
    return map.containsKey(key);
  }

  /**

  public Map<K, Long> asMap() {
    Map<K, Long> result = asMap;
    return (result == null) ? asMap = createAsMap() : result;
  }

  private Map<K, Long> createAsMap() {
    return Collections.unmodifiableMap(
        Maps.transformValues(
            map,
            new Function<AtomicLong, Long>() {
              @Override
              public Long apply(AtomicLong atomic) {
                return atomic.get();