Legacy Repository System

/**
 * Main legacy repository system implementation providing Maven2 compatibility
 * @Component(role = RepositorySystem.class, hint = "default")
 */
public class LegacyRepositorySystem implements RepositorySystem {
    /**
     * Creates an artifact with the specified coordinates
     * @param groupId artifact group identifier
     * @param artifactId artifact identifier
     * @param version artifact version
     * @param scope dependency scope
     * @param type artifact type (jar, war, etc.)
     * @return created Artifact instance
     */
    public Artifact createArtifact(String groupId, String artifactId, String version, 
                                  String scope, String type);
    
    /**
     * Creates an artifact with classifier
     * @param groupId artifact group identifier
     * @param artifactId artifact identifier
     * @param version artifact version
     * @param scope dependency scope
     * @param type artifact type
     * @param classifier artifact classifier
     * @return created Artifact instance
     */
    public Artifact createArtifactWithClassifier(String groupId, String artifactId, String version,
                                                String type, String classifier);
    
    /**
     * Creates a dependency artifact
     * @param dependency dependency information
     * @return created Artifact instance
     */
    public Artifact createDependencyArtifact(Dependency dependency);
    
    /**
     * Creates the default local repository
     * @return default local ArtifactRepository
     * @throws InvalidRepositoryException if repository creation fails
     */
    public ArtifactRepository createDefaultLocalRepository() throws InvalidRepositoryException;
    
    /**
     * Creates a local repository at the specified path
     * @param localRepositoryPath path to local repository
     * @return local ArtifactRepository
     * @throws InvalidRepositoryException if repository creation fails
     */
    public ArtifactRepository createLocalRepository(String localRepositoryPath) 
                                                   throws InvalidRepositoryException;
    
    /**
     * Creates a local repository from URL
     * @param url repository URL
     * @return local ArtifactRepository
     * @throws InvalidRepositoryException if repository creation fails
     */
    public ArtifactRepository createLocalRepository(URL url) throws InvalidRepositoryException;
    
    /**
     * Creates a default remote repository
     * @return default remote ArtifactRepository
     * @throws InvalidRepositoryException if repository creation fails
     */
    public ArtifactRepository createDefaultRemoteRepository() throws InvalidRepositoryException;
    
    /**
     * Resolves artifacts according to the resolution request
     * @param request artifact resolution request
     * @return resolution result with resolved artifacts
     * @throws ArtifactResolutionException if resolution fails
     */
    public ArtifactResolutionResult resolve(ArtifactResolutionRequest request) 
                                          throws ArtifactResolutionException;
    
    /**
     * Publishes (deploys) an artifact to a repository
     * @param repository target repository
     * @param source source file to publish
     * @param artifact artifact metadata
     * @throws ArtifactNotPublishedException if publication fails
     */
    public void publish(ArtifactRepository repository, File source, Artifact artifact, 
                       ArtifactMetadata metadata) throws ArtifactNotPublishedException;
    
    /**
     * Installs an artifact to the local repository
     * @param repository local repository
     * @param source source file to install
     * @param artifact artifact metadata
     * @throws ArtifactInstallationException if installation fails
     */
    public void install(ArtifactRepository repository, File source, Artifact artifact) 
                       throws ArtifactInstallationException;
    
    /**
     * Injects mirror configurations into repository list
     * @param repositories list of repositories to modify
     * @param mirrors list of mirror configurations
     */
    public void injectMirror(List<ArtifactRepository> repositories, List<Mirror> mirrors);
    
    /**
     * Injects authentication configurations into repository list
     * @param repositories list of repositories to modify
     * @param servers list of server configurations with authentication
     */
    public void injectAuthentication(List<ArtifactRepository> repositories, List<Server> servers);
    
    /**
     * Injects proxy configurations into repository list
     * @param repositories list of repositories to modify
     * @param proxies list of proxy configurations
     */
    public void injectProxy(List<ArtifactRepository> repositories, List<Proxy> proxies);
}

/**
 * Interface for managing Wagon transport protocols
 */
public interface WagonManager {
    /**
     * Role constant for Plexus component lookup
     */
    String ROLE = WagonManager.class.getName();
    
    /**
     * Gets authentication information for a server ID
     * @param id server identifier
     * @return AuthenticationInfo for the server
     */
    AuthenticationInfo getAuthenticationInfo(String id);
    
    /**
     * Gets proxy information for a protocol
     * @param protocol transport protocol
     * @return ProxyInfo for the protocol
     */
    ProxyInfo getProxy(String protocol);
    
    /**
     * Downloads an artifact from a repository
     * @param artifact artifact to download
     * @param repository source repository
     * @throws TransferFailedException if transfer fails
     * @throws ResourceDoesNotExistException if artifact doesn't exist
     */
    void getArtifact(Artifact artifact, ArtifactRepository repository) 
                    throws TransferFailedException, ResourceDoesNotExistException;
    
    /**
     * Downloads an artifact from a repository to a destination
     * @param artifact artifact to download
     * @param repository source repository
     * @param destination destination file
     * @throws TransferFailedException if transfer fails
     * @throws ResourceDoesNotExistException if artifact doesn't exist
     */
    void getArtifact(Artifact artifact, ArtifactRepository repository, File destination) 
                    throws TransferFailedException, ResourceDoesNotExistException;
    
    /**
     * Gets the mirror repository for a given repository
     * @param repository original repository
     * @return mirror repository or original if no mirror configured
     */
    ArtifactRepository getMirrorRepository(ArtifactRepository repository);
    
    /**
     * Uploads an artifact to a repository
     * @param source source file to upload
     * @param artifact artifact metadata
     * @param repository target repository
     * @throws TransferFailedException if transfer fails
     */
    void putArtifact(File source, Artifact artifact, ArtifactRepository repository) 
                    throws TransferFailedException;
    
    /**
     * Uploads artifact metadata to a repository
     * @param metadata artifact metadata to upload
     * @param repository target repository
     * @throws TransferFailedException if transfer fails
     */
    void putArtifactMetadata(File metadata, ArtifactMetadata artifactMetadata, 
                           ArtifactRepository repository) throws TransferFailedException;
}

/**
 * Default implementation of WagonManager
 */
public class DefaultWagonManager implements WagonManager {
    /**
     * Gets authentication information for a server ID
     */
    public AuthenticationInfo getAuthenticationInfo(String id);
    
    /**
     * Gets proxy information for a protocol
     */
    public ProxyInfo getProxy(String protocol);
    
    /**
     * Downloads an artifact from a repository
     */
    public void getArtifact(Artifact artifact, ArtifactRepository repository) 
                           throws TransferFailedException, ResourceDoesNotExistException;
    
    /**
     * Gets the mirror repository for a given repository
     */
    public ArtifactRepository getMirrorRepository(ArtifactRepository repository);
    
    /**
     * Uploads an artifact to a repository
     */
    public void putArtifact(File source, Artifact artifact, ArtifactRepository repository) 
                           throws TransferFailedException;
}

/**
 * Interface for managing artifact update checks
 */
public interface UpdateCheckManager {
    /**
     * Role constant for Plexus component lookup
     */
    String ROLE = UpdateCheckManager.class.getName();
    
    /**
     * Checks if an artifact needs to be updated
     * @param artifact artifact to check
     * @param repository repository to check against
     * @param file local file representing the artifact
     * @return true if artifact needs update
     */
    boolean isUpdateRequired(Artifact artifact, ArtifactRepository repository, File file);
    
    /**
     * Records that an artifact was checked for updates
     * @param artifact artifact that was checked
     * @param repository repository that was checked
     * @param file local file representing the artifact
     */
    void touch(Artifact artifact, ArtifactRepository repository, File file);
    
    /**
     * Checks if metadata needs to be updated
     * @param metadata metadata to check
     * @param repository repository to check against
     * @param file local metadata file
     * @return true if metadata needs update
     */
    boolean isUpdateRequired(ArtifactMetadata metadata, ArtifactRepository repository, File file);
    
    /**
     * Records that metadata was checked for updates
     * @param metadata metadata that was checked
     * @param repository repository that was checked
     * @param file local metadata file
     */
    void touch(ArtifactMetadata metadata, ArtifactRepository repository, File file);
}

/**
 * Default implementation of UpdateCheckManager
 */
public class DefaultUpdateCheckManager implements UpdateCheckManager {
    /**
     * Checks if an artifact needs to be updated
     */
    public boolean isUpdateRequired(Artifact artifact, ArtifactRepository repository, File file);
    
    /**
     * Records that an artifact was checked for updates
     */
    public void touch(Artifact artifact, ArtifactRepository repository, File file);
    
    /**
     * Checks if metadata needs to be updated
     */
    public boolean isUpdateRequired(ArtifactMetadata metadata, ArtifactRepository repository, File file);
    
    /**
     * Records that metadata was checked for updates
     */
    public void touch(ArtifactMetadata metadata, ArtifactRepository repository, File file);
}

/**
 * Interface for resolving conflicts between artifact versions
 */
public interface ConflictResolver {
    /**
     * Role constant for Plexus component lookup
     */
    String ROLE = ConflictResolver.class.getName();
    
    /**
     * Resolves conflict between two resolution nodes
     * @param node1 first conflicting node
     * @param node2 second conflicting node
     * @return ResolutionNode representing the resolved choice
     * @throws ConflictResolverException if resolution fails
     */
    ResolutionNode resolveConflict(ResolutionNode node1, ResolutionNode node2) 
                                  throws ConflictResolverException;
}

/**
 * Factory for creating conflict resolver instances
 */
public interface ConflictResolverFactory {
    /**
     * Role constant for Plexus component lookup
     */
    String ROLE = ConflictResolverFactory.class.getName();
    
    /**
     * Creates a conflict resolver by hint
     * @param hint resolver type hint
     * @return ConflictResolver instance
     * @throws ConflictResolverNotFoundException if resolver not found
     */
    ConflictResolver getConflictResolver(String hint) throws ConflictResolverNotFoundException;
}

/**
 * Chooses the nearest version in the dependency tree
 */
public class NearestConflictResolver implements ConflictResolver {
    public ResolutionNode resolveConflict(ResolutionNode node1, ResolutionNode node2);
}

/**
 * Chooses the newest version among conflicting artifacts
 */
public class NewestConflictResolver implements ConflictResolver {
    public ResolutionNode resolveConflict(ResolutionNode node1, ResolutionNode node2);
}

/**
 * Chooses the oldest version among conflicting artifacts
 */
public class OldestConflictResolver implements ConflictResolver {
    public ResolutionNode resolveConflict(ResolutionNode node1, ResolutionNode node2);
}

/**
 * Chooses the farthest version in the dependency tree
 */
public class FarthestConflictResolver implements ConflictResolver {
    public ResolutionNode resolveConflict(ResolutionNode node1, ResolutionNode node2);
}

import org.apache.maven.repository.legacy.LegacyRepositorySystem;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.repository.ArtifactRepository;

// Create repository system instance
LegacyRepositorySystem repositorySystem = new LegacyRepositorySystem();

// Create local repository
try {
    ArtifactRepository localRepo = repositorySystem.createDefaultLocalRepository();
    System.out.println("Local repository: " + localRepo.getUrl());
    
    // Create remote repository
    ArtifactRepository remoteRepo = repositorySystem.createDefaultRemoteRepository();
    System.out.println("Remote repository: " + remoteRepo.getUrl());
    
} catch (InvalidRepositoryException e) {
    System.err.println("Repository creation failed: " + e.getMessage());
}

// Create artifacts
Artifact artifact = repositorySystem.createArtifact(
    "org.apache.commons",
    "commons-lang3", 
    "3.12.0",
    "compile",
    "jar"
);

Artifact classifiedArtifact = repositorySystem.createArtifactWithClassifier(
    "org.apache.commons",
    "commons-lang3",
    "3.12.0", 
    "jar",
    "sources"
);

// Resolve artifacts
ArtifactResolutionRequest request = new ArtifactResolutionRequest();
request.setArtifact(artifact);
request.setLocalRepository(localRepository);
request.setRemoteRepositories(Arrays.asList(remoteRepository));

try {
    ArtifactResolutionResult result = repositorySystem.resolve(request);
    
    if (result.isSuccess()) {
        System.out.println("Artifact resolved successfully");
        Set<Artifact> resolvedArtifacts = result.getArtifacts();
        System.out.println("Resolved " + resolvedArtifacts.size() + " artifacts");
    } else {
        System.err.println("Resolution failed");
        for (Exception exception : result.getExceptions()) {
            System.err.println("  " + exception.getMessage());
        }
    }
    
} catch (ArtifactResolutionException e) {
    System.err.println("Resolution error: " + e.getMessage());
}

import org.apache.maven.settings.Mirror;
import org.apache.maven.settings.Server;

// Configure mirrors
List<Mirror> mirrors = new ArrayList<>();
Mirror centralMirror = new Mirror();
centralMirror.setId("central-mirror");
centralMirror.setMirrorOf("central");
centralMirror.setUrl("https://repo.company.com/maven2/");
mirrors.add(centralMirror);

// Apply mirror configuration
List<ArtifactRepository> repositories = Arrays.asList(centralRepo, otherRepo);
repositorySystem.injectMirror(repositories, mirrors);

// Configure authentication
List<Server> servers = new ArrayList<>();
Server server = new Server();
server.setId("central-mirror");
server.setUsername("user");
server.setPassword("password");
servers.add(server);

// Apply authentication configuration
repositorySystem.injectAuthentication(repositories, servers);

System.out.println("Mirror and authentication configured");

import org.apache.maven.repository.legacy.WagonManager;
import org.apache.maven.repository.legacy.DefaultWagonManager;
import org.apache.maven.wagon.authentication.AuthenticationInfo;
import org.apache.maven.wagon.proxy.ProxyInfo;

// Use wagon manager for transport operations
WagonManager wagonManager = new DefaultWagonManager();

// Get authentication info
AuthenticationInfo authInfo = wagonManager.getAuthenticationInfo("server-id");
if (authInfo != null) {
    System.out.println("Authentication configured for server");
}

// Get proxy info
ProxyInfo proxyInfo = wagonManager.getProxy("http");
if (proxyInfo != null) {
    System.out.println("Proxy configured: " + proxyInfo.getHost());
}

// Download artifact
try {
    wagonManager.getArtifact(artifact, repository);
    System.out.println("Artifact downloaded successfully");
} catch (TransferFailedException | ResourceDoesNotExistException e) {
    System.err.println("Download failed: " + e.getMessage());
}

import org.apache.maven.repository.legacy.UpdateCheckManager;
import org.apache.maven.repository.legacy.DefaultUpdateCheckManager;

// Manage update checks
UpdateCheckManager updateManager = new DefaultUpdateCheckManager();
File localArtifactFile = new File(localRepo.getBasedir(), "path/to/artifact.jar");

// Check if update is required
boolean updateRequired = updateManager.isUpdateRequired(artifact, remoteRepository, localArtifactFile);

if (updateRequired) {
    System.out.println("Artifact needs update");
    // Perform update...
    
    // Record that we checked
    updateManager.touch(artifact, remoteRepository, localArtifactFile);
} else {
    System.out.println("Artifact is up to date");
}

import org.apache.maven.repository.legacy.resolver.conflict.ConflictResolver;
import org.apache.maven.repository.legacy.resolver.conflict.NearestConflictResolver;
import org.apache.maven.repository.legacy.resolver.conflict.NewestConflictResolver;

// Use different conflict resolution strategies
ConflictResolver nearestResolver = new NearestConflictResolver();
ConflictResolver newestResolver = new NewestConflictResolver();

// Resolve conflicts between nodes
ResolutionNode node1 = // ... create first conflicting node
ResolutionNode node2 = // ... create second conflicting node

try {
    ResolutionNode nearestChoice = nearestResolver.resolveConflict(node1, node2);
    ResolutionNode newestChoice = newestResolver.resolveConflict(node1, node2);
    
    System.out.println("Nearest resolver chose: " + nearestChoice.getArtifact());
    System.out.println("Newest resolver chose: " + newestChoice.getArtifact());
    
} catch (ConflictResolverException e) {
    System.err.println("Conflict resolution failed: " + e.getMessage());
}

public void performRepositoryOperations() {
    try {
        // Initialize repository system
        LegacyRepositorySystem repoSystem = new LegacyRepositorySystem();
        
        // Set up repositories
        ArtifactRepository localRepo = repoSystem.createDefaultLocalRepository();
        ArtifactRepository remoteRepo = repoSystem.createDefaultRemoteRepository();
        
        // Configure mirrors and authentication
        configureMirrorsAndAuth(repoSystem, Arrays.asList(remoteRepo));
        
        // Create and resolve artifact
        Artifact artifact = repoSystem.createArtifact(
            "junit", "junit", "4.13.2", "test", "jar"
        );
        
        ArtifactResolutionRequest request = new ArtifactResolutionRequest();
        request.setArtifact(artifact);
        request.setLocalRepository(localRepo);
        request.setRemoteRepositories(Arrays.asList(remoteRepo));
        
        ArtifactResolutionResult result = repoSystem.resolve(request);
        
        if (result.isSuccess()) {
            // Install to local repository
            File artifactFile = artifact.getFile();
            repoSystem.install(localRepo, artifactFile, artifact);
            System.out.println("Artifact installed successfully");
        }
        
    } catch (Exception e) {
        System.err.println("Repository operation failed: " + e.getMessage());
    }
}