*   <li>If the value is null, get the value from the context.</li>
     *   <li>If the value is null, but the context contains the expression, don't replace the expression string
     *       with the value, and continue to find other expressions.</li>
     *   <li>If the value is null, get it from the model properties.</li>
     * </ul>
     */

                }
            }
            this.value = ALIASES.getProperty(value, value);
        }

        @Override
        public int getType() {
            return STRING_ITEM;
        }

        @Override
        public boolean isNull() {
            return value == null || value.isEmpty();
        }

        /**
         * Returns a comparable value for a qualifier.
         * <p>

            return ValidationReportLevel.valueOf(level.toUpperCase(Locale.ENGLISH));
        } catch (IllegalArgumentException e) {
            logger.warn(
                    "Invalid value specified for property {}: '{}'. Supported values are (case insensitive): {}",
                    MAVEN_PLUGIN_VALIDATION_KEY,
                    level,
                    Arrays.toString(ValidationReportLevel.values()));

        RecursionInterceptor recursionInterceptor = createRecursionInterceptor(request);
        return value -> {
            if (value != null && value.contains("${")) {
                String c = cache.get(value);
                if (c == null) {
                    try {
                        c = interpolator.interpolate(value, recursionInterceptor);
                    } catch (InterpolationException e) {

                .flatMap(properties -> properties.entrySet().stream())
                .filter(e -> e.getValue() != null)
                .collect(Collectors.toMap(
                        e -> String.valueOf(e.getKey()), e -> String.valueOf(e.getValue()), (k1, k2) -> k2));
    }

    private String getUserAgent() {
        String version = runtimeInformation.getMavenVersion();
        version = version.isEmpty() ? version : "/" + version;

        Map<String, Object> configProperties =
                systemSessionFactory.newRepositorySession(request).getConfigProperties();
        assertEquals(String.valueOf(Float.MAX_VALUE), configProperties.get("aether.priority.FileTransporterFactory"));
        assertEquals(String.valueOf(Float.MAX_VALUE), configProperties.get("aether.priority.ApacheTransporterFactory"));
        properties.remove("maven.resolver.transport");

        // wagon

append(descriptionOf(value)); append("L>"); } else if (value instanceof Float) { append('<'); append(descriptionOf(value)); append("F>"); } else if (value.getClass().isArray()) { appendValueList("[",", ","]", new ArrayIterator(value)); } else { append('<'); append(descriptionOf(value)); append('>'); } return this; } private String descriptionOf(Object value) { try { return valueOf(value); } catch (Exception e) { return value.getClass().getName() + "@" + Integer.toHexString(value.hashCode()); } } @Override...

    }

    public void setActive(boolean active) {
        setActiveString(String.valueOf(active));
    }

    public int getPort() {
        return (getPortString() != null) ? Integer.parseInt(getPortString()) : 8080;
    }

    public void setPort(int port) {
        setPortString(String.valueOf(port));
    }
          </code>
        </codeSegment>
        <codeSegment>

     * If no module is found, or if module information cannot be extracted, then this constructor
     * builds an empty map.
     *
     * <p>If the {@code resolve} parameter value is {@code false}, then some or all map values may
     * be null instead of the actual module name. This option can avoid the cost of reading module
     * descriptors when only the modules existence needs to be verified.</p>
     *

        List<String> versions = getProjects()
                .getOrDefault(artifact.getGroupId(), Collections.emptyMap())
                .getOrDefault(artifact.getArtifactId(), Collections.emptyMap())
                .values()
                .stream()
                .map(MavenProject::getVersion)
                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
        if (!versions.isEmpty()) {