The Maven Team
 -----

Configuration levels in maven

 In maven configuration control happens on four differ levels: the site level, the group level,
 the project level, and the user level. On the site level you can configure maven for all users
 utilizing the local installation, the group level allows configuration management for all the projects
 that belong to the same group, the project level allows configuration management at

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<!--
  | Improvements:
  |
  | o add specification element to a field, this would be more a technical description of
  |   what is allowed in the field.
  |
  | o validators: there could be several levels of validation. Simple type validation could
  |   be done with a regex, but we need inter-field validation and rules which could be
  |   dealt with by something like drools.
  |

import org.eclipse.aether.impl.MetadataGenerator;
import org.eclipse.aether.impl.MetadataGeneratorFactory;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven GA level metadata generator factory.
 */
@Named(VersionsMetadataGeneratorFactory.NAME)
@Singleton
public class VersionsMetadataGeneratorFactory implements MetadataGeneratorFactory {
    public static final String NAME = "versions";

                projectPrefixValueSource =
                        new ProblemDetectingValueSource(projectPrefixValueSource, PREFIX_POM, PREFIX_PROJECT, problems);
            }

            prefixlessObjectBasedValueSource = new ObjectBasedValueSource(model);
            if (request.getValidationLevel() >= ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_2_0) {

import java.nio.file.Path;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;

import org.apache.maven.api.metadata.Metadata;
import org.apache.maven.api.metadata.Plugin;

/**
 * Maven G level metadata.
 */
final class PluginsMetadata extends MavenMetadata {
    static final class PluginInfo {
        final String groupId;

        private final String artifactId;

import org.apache.maven.api.metadata.Metadata;
import org.apache.maven.api.metadata.Versioning;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.ArtifactProperties;

/**
 * Maven GA level metadata.
 */
final class VersionsMetadata extends MavenMetadata {

    private final Artifact artifact;

    VersionsMetadata(Artifact artifact, Date timestamp) {

            throws ModelBuilderException {
        Model model;
        problems.setSource(modelSource.getLocation());
        try {
            boolean strict = request.getValidationLevel() >= ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_2_0;

            try (InputStream is = modelSource.openStream()) {
                model = modelProcessor.read(XmlReaderRequest.builder()
                        .strict(strict)

        config.setUserProperties(userProperties);
        config.setValidationLevel(
                lenientValidation
                        ? ModelBuildingRequest.VALIDATION_LEVEL_MAVEN_2_0
                        : ModelBuildingRequest.VALIDATION_LEVEL_STRICT);

        DefaultRepositorySystemSession repoSession = MavenTestHelper.createSession(repositorySystem);
        LocalRepository localRepo =

     * users to migrate their projects.
     */
    int VALIDATION_LEVEL_MAVEN_2_0 = 20;

    /**
     * Denotes validation as performed by Maven 3.0. This validation level is meant for existing projects.
     */
    int VALIDATION_LEVEL_MAVEN_3_0 = 30;

    /**
     * Denotes validation as performed by Maven 3.1. This validation level is meant for existing projects.

import org.eclipse.aether.impl.MetadataGenerator;
import org.eclipse.aether.impl.MetadataGeneratorFactory;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven G level metadata generator factory.
 */
@Named(PluginsMetadataGeneratorFactory.NAME)
@Singleton
public class PluginsMetadataGeneratorFactory implements MetadataGeneratorFactory {
    public static final String NAME = "plugins";