*
 * This collection is optimized for safe concurrent access over a very small number of elements.
 *
 * This collection and is expected to hold fewer than 10 elements. Each operation is _O(N)_, and so
 * building an instance with _N_ elements is _O(N**2)_.
 */
internal sealed class Tags {
  /**
   * Returns a tags instance that maps [key] to [value]. If [value] is null, this returns a tags

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

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

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

import javax.inject.Singleton;

import java.util.Locale;

import org.apache.maven.model.Activation;
import org.apache.maven.model.ActivationOS;
import org.apache.maven.model.Profile;
import org.apache.maven.model.building.ModelProblemCollector;
import org.apache.maven.model.profile.ProfileActivationContext;
import org.apache.maven.utils.Os;

/**
 * Determines profile activation based on the operating system of the current runtime platform.

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

import java.io.File;
import java.util.List;

import org.apache.maven.model.building.ModelProblem;

/**
 * @deprecated use {@code org.apache.maven.api.services.ProjectBuilder} instead
 */
@Deprecated(since = "4.0.0")
public class ProjectBuildingException extends Exception {

        File f2 = getTestFile("src/test/resources/projects/grandchild-check/child/grandchild/pom.xml");

        getProject(f1);

        // it's the building of the grandchild project, having already cached the child project
        // (but not the parent project), which causes the problem.
        getProject(f2);
    }

import org.apache.maven.lifecycle.internal.TaskSegment;
import org.apache.maven.lifecycle.internal.builder.Builder;

/**
 * <p>
 * A {@link Builder} encapsulates a strategy for building a set of Maven projects. The default strategy in Maven builds
 * the projects serially, but a {@link Builder} can employ any type of concurrency model to build the projects.
 */
@Named("singlethreaded")
@Singleton

import java.io.File;
import java.util.HashMap;
import java.util.Map;

/**
 * Holds all POM files that are known to the reactor. This allows the project builder to resolve imported POMs from the
 * reactor when building another project's effective model.
 */
class ReactorModelPool {

    private final Map<CacheKey, File> pomFiles = new HashMap<>();

    public File get(String groupId, String artifactId, String version) {

import org.apache.maven.api.services.Source;

/**
 * The {@code ModelParser} interface is used to locate and read {@link Model}s from the file system.
 * This allows plugging in additional syntaxes for the main model read by Maven when building a project.
 *
 * @since 4.0.0
 */
@Experimental
@Consumer
@Named
public interface ModelParser extends SpiService {

    /**

 * </ol>
 * <p>
 * Implementations of this interface will be discovered through the Java ServiceLoader mechanism
 * and will be called in sequence during model building.
 * <p>
 * Example usage:
 * <pre>
 * public class CustomModelTransformer implements ModelTransformer {
 *     public Model transformEffectiveModel(Model model) throws ModelTransformerException {

    /**
     * Sets up the search conditions for listing related content entities.
     * Configures wildcard searches for term and content fields, and sets up ordering.
     *
     * @param cb the condition bean for building the query
     * @param relatedContentPager the pager containing search parameters
     */
    protected void setupListCondition(final RelatedContentCB cb, final RelatedContentPager relatedContentPager) {