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

import java.util.Properties;

/**
 * @since 3.2.3
 */
public class SystemProperties {
    /**
     * Thread-safe System.properties copy implementation.
     */
    public static void addSystemProperties(Properties props) {
        props.putAll(getSystemProperties());
    }

    /**

    public Properties getSystemProperties() {
        if (systemProperties == null) {
            systemProperties = new Properties();
        }

        return systemProperties;
    }

    @Override
    public DefaultModelBuildingRequest setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = new Properties();
            synchronized (

        this.userHomeDirectory = requireNonNull(userHomeDirectory);

        this.userProperties = requireNonNull(userProperties);
        this.systemProperties = requireNonNull(systemProperties);
        this.topDirectory = requireNonNull(topDirectory);
        this.rootDirectory = rootDirectory;
        this.coreExtensions = coreExtensions;
        this.ciInfo = ciInfo;

                    Map<String, String> systemProperties,
                    Instant startTime,
                    Path topDirectory,
                    Path rootDirectory) {
                this.userProperties = Map.copyOf(userProperties);
                this.systemProperties = Map.copyOf(systemProperties);
                Map<String, String> cp = new HashMap<>(systemProperties);
                cp.putAll(userProperties);

            this.inactiveProfileIds = inactiveProfileIds;
            return this;
        }

        public ModelBuilderRequestBuilder systemProperties(Map<String, String> systemProperties) {
            this.systemProperties = systemProperties;
            return this;
        }

        public ModelBuilderRequestBuilder userProperties(Map<String, String> userProperties) {

    public Properties getSystemProperties() {
        if (systemProperties == null) {
            systemProperties = new Properties();
        }

        return systemProperties;
    }

    @Override
    public DefaultSettingsBuildingRequest setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = new Properties();

        }
        systemProperties.setProperty(Constants.MAVEN_VERSION_MAJOR, versionElements[0]);
        systemProperties.setProperty(Constants.MAVEN_VERSION_MINOR, versionElements[1]);
        systemProperties.setProperty(Constants.MAVEN_VERSION_PATCH, versionElements[2]);
        systemProperties.setProperty(Constants.MAVEN_VERSION_SNAPSHOT, Boolean.toString(snapshot));

     */
    @SuppressWarnings("unchecked")
    public DefaultProfileActivationContext setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = Collections.unmodifiableMap((Map) systemProperties);
        } else {
            this.systemProperties = Collections.emptyMap();
        }

        return this;
    }

    /**

        activator = null;
    }

    protected ProfileActivationContext newContext(final Properties userProperties, final Properties systemProperties) {
        DefaultProfileActivationContext context = new DefaultProfileActivationContext();
        return context.setUserProperties(userProperties).setSystemProperties(systemProperties);
    }

    protected void assertActivation(boolean active, Profile profile, ProfileActivationContext context) {

                or(paths::getProperty, prefix("cli.", commandLine::getOptionValue), systemProperties::getProperty);

        Path mavenConf;
        if (systemProperties.getProperty(MAVEN_INSTALLATION_CONF) != null) {
            mavenConf = fileSystem.getPath(systemProperties.getProperty(MAVEN_INSTALLATION_CONF));
        } else if (systemProperties.getProperty("maven.conf") != null) {