* specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.profile.activation;

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

import java.util.Objects;
import java.util.Optional;

import org.apache.maven.api.model.Activation;
import org.apache.maven.api.model.Profile;
import org.apache.maven.model.building.ModelProblemCollector;

     |
     | This profile example uses the JDK version to trigger activation, and provides a JDK-specific repo.
    <profile>
      <id>jdk-1.4</id>

      <activation>
        <jdk>1.4</jdk>
      </activation>

      <repositories>
        <repository>
          <id>jdk14</id>
          <name>Repository for JDK 1.4 builds</name>

                    + ") with new instance from source: " + profile.getSource());
        }

        profilesById.put(profile.getId(), profile);

        Activation activation = profile.getActivation();

        if (activation != null && activation.isActiveByDefault()) {
            activateAsDefault(profileId);
        }
    }

    /* (non-Javadoc)

                                    + " expressions are not supported during profile activation.",
                            locationSupplier.get());
                }
            }
        };
        Optional<Activation> root = Optional.of(activation);
        stk.push(new ActivationFrame("activation", root));

    <profiles>
        <profile>
            <id>two-conditions</id>
            <activation>
                <file>
                    <exists>simple.xml</exists>
                </file>
                <property>
                    <name>myproperty</name>
                    <value>test</value>
                </property>
            </activation>
            <properties>
                <profile.file>activated-1</profile.file>

     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @return The system properties, never {@code null}.
     */
    Properties getSystemProperties();

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

    private static final String JDK_VERSION = System.getProperty("java.version");

    @Override
    public boolean isActive(Profile profile) throws ProfileActivationException {
        Activation activation = profile.getActivation();

        String jdk = activation.getJdk();

        // null case is covered by canDetermineActivation(), so we can do a straight startsWith() here.
        if (jdk.startsWith("[") || jdk.startsWith("(")) {

    /**
     * Determines the profiles which are active in the specified activation context. Active profiles will eventually be
     * injected into the model.
     *
     * @param profiles The profiles whose activation status should be determined, must not be {@code null}.
     * @param context The environmental context used to determine the activation status of a profile, must not be
     *            {@code null}.

 that manages the steps sequence.

 The sequence is divided into 2 phases:

 * phase 1

   ** profile activation: see {{{./apidocs/org/apache/maven/model/profile/activation/package-summary.html}available activators}}.
   Notice that model interpolation hasn't happened yet, then interpolation for file-based activation is limited to
   <<<$\{basedir}>>> (since Maven 3), <<<$\{rootDirectory}>>> (since Maven 4), system properties and user properties

import java.util.Properties;

import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toMap;

/**
 * Describes the environmental context used to determine the activation status of profiles.
 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */
@Deprecated(since = "4.0.0")
public class DefaultProfileActivationContext implements ProfileActivationContext {