import java.util.Optional;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Event sent by maven during various phases of the build process.
 * Such events can be listened to using {@link Listener}s objects
 * registered in the {@link Session}.
 *
 * @since 4.0.0
 */
@Experimental
public interface Event {

    /**
     * Gets the type of the event.

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.api;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;

/**
 * Version constraint for dependency.
 * Constraint is either a range ("[1,2)") or recommended version ("1.0").

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.api;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Immutable;

import static org.apache.maven.api.ExtensibleEnums.language;

/**
 * Language.
 * <p>

import java.util.Optional;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.cli.Options;

/**
 * Defines the options specific to the Maven upgrade tool.
 * This interface extends the general {@link Options} interface, adding upgrade-specific configuration options.
 *
 * @since 4.0.0
 */
@Experimental
public interface UpgradeOptions extends Options {
    /**

import java.util.List;
import java.util.Objects;

import org.apache.maven.api.ArtifactCoordinates;
import org.apache.maven.api.RemoteRepository;
import org.apache.maven.api.Session;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Immutable;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.NotThreadSafe;
import org.apache.maven.api.annotations.Nullable;

import org.apache.maven.api.Service;
import org.apache.maven.api.Session;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Builds the effective toolchains from a user toolchains file and/or an installation toolchains file.
 *
 * @since 4.0.0
 */
@Experimental
public interface ToolchainsBuilder extends Service {

    /**

import org.apache.maven.api.annotations.Consumer;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.di.Named;

/**
 * Component able to contribute to Maven session user properties. This SPI component is invoked
 * very early, while there is no session created yet.
 *
 * @since 4.0.0
 */
@Experimental
@Consumer
@Named
public interface PropertyContributor extends SpiService {
    /**

import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Used if your Mojo needs to fork a <a href="/ref/3.0.4/maven-core/lifecycles.html">lifecycle</a>.
 *
 * @since 4.0.0
 */
@Experimental
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Inherited

 * under the License.
 */
package org.apache.maven.api.cache;

import java.util.List;
import java.util.function.Function;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.services.Request;
import org.apache.maven.api.services.Result;

/**
 * Interface for caching request results in Maven. This cache implementation provides

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

import org.apache.maven.api.Service;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Service for detecting and providing information about the operating system (OS)
 * on which the application is running.
 * <p>