* 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() {
        return systemProperties;
    }

    public ProjectBuildingRequest setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = SystemProperties.copyProperties(systemProperties);
        } else {
            this.systemProperties.clear();
        }

        return this;
    }

            this.inactiveProfileIds = inactiveProfileIds;
            return this;
        }

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

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

                  <version>2.4</version>
                  <configuration>
                    <systemProperties>
                      <property>
                        <name>my.property</name>
                        <value>my.value</value>
                      </property>
                    </systemProperties>
                  </configuration>
                </plugin>
            </plugins>
        </pluginManagement>

     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.
     * @return This request, never {@code null}.
     */
    ProjectBuildingRequest setSystemProperties(Properties systemProperties);

    /**
     * Gets the system properties to use for interpolation and profile activation. The system properties are collected

          </excludes>
          <systemProperties>
            <property>
              <name>JAVA_HOME</name>
              <value>${JAVA_HOME}</value>
            </property>
            <property>
              <name>M2_HOME</name>
              <value>${M2_HOME}</value>
            </property>
          </systemProperties>
        </configuration>
      </plugin>
    </plugins>
  </build>

        return setSystemProperties(toMap(systemProperties));
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected
     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.

        return injector.getInstance(Session.class);
    }

    static class DefaultSession extends AbstractSession {

        private final Map<String, String> systemProperties;
        private Instant startTime = Instant.now();

        DefaultSession(RepositorySystemSession session, RepositorySystem repositorySystem, Lookup lookup) {

        }
        return goals;
    }

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

        return systemProperties;
    }

    @Override
    public Properties getUserProperties() {
        if (userProperties == null) {

import javax.inject.Named;
import javax.inject.Singleton;

import java.io.File;
import java.io.IOException;

import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.properties.internal.SystemProperties;
import org.apache.maven.settings.building.DefaultSettingsBuildingRequest;
import org.apache.maven.settings.building.SettingsBuilder;
import org.apache.maven.settings.building.SettingsBuildingException;