Plugin Registry

/**
 * Plugin mapping information for groupId directories
 * Maps plugin prefixes to artifactIds for Maven plugin resolution
 */
public class Plugin implements Serializable, Cloneable {
  // Constructors
  public Plugin();
  
  // Plugin identification
  public String getName();
  public void setName(String name);
  public String getPrefix();
  public void setPrefix(String prefix);
  public String getArtifactId();
  public void setArtifactId(String artifactId);
  
  // Object operations
  public Plugin clone();
}

import org.apache.maven.artifact.repository.metadata.Plugin;

// Create plugin mapping for compiler plugin
Plugin compilerPlugin = new Plugin();
compilerPlugin.setName("Apache Maven Compiler Plugin");
compilerPlugin.setPrefix("compiler");
compilerPlugin.setArtifactId("maven-compiler-plugin");

// Create plugin mapping for surefire plugin
Plugin surefirePlugin = new Plugin();
surefirePlugin.setName("Maven Surefire Plugin");
surefirePlugin.setPrefix("surefire");
surefirePlugin.setArtifactId("maven-surefire-plugin");

// Plugin properties
System.out.println("Plugin name: " + compilerPlugin.getName());
System.out.println("Plugin prefix: " + compilerPlugin.getPrefix());
System.out.println("Plugin artifactId: " + compilerPlugin.getArtifactId());

// Plugin management methods in Metadata class
public List<Plugin> getPlugins();
public void setPlugins(List<Plugin> plugins);
public void addPlugin(Plugin plugin);
public void removePlugin(Plugin plugin);

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.artifact.repository.metadata.Plugin;
import java.util.List;

// Create groupId-level metadata
Metadata groupMetadata = new Metadata();
groupMetadata.setGroupId("org.apache.maven.plugins");

// Add compiler plugin
Plugin compilerPlugin = new Plugin();
compilerPlugin.setName("Apache Maven Compiler Plugin");
compilerPlugin.setPrefix("compiler");
compilerPlugin.setArtifactId("maven-compiler-plugin");
groupMetadata.addPlugin(compilerPlugin);

// Add surefire plugin
Plugin surefirePlugin = new Plugin();
surefirePlugin.setName("Maven Surefire Plugin");
surefirePlugin.setPrefix("surefire");
surefirePlugin.setArtifactId("maven-surefire-plugin");
groupMetadata.addPlugin(surefirePlugin);

// Add failsafe plugin
Plugin failsafePlugin = new Plugin();
failsafePlugin.setName("Maven Failsafe Plugin");
failsafePlugin.setPrefix("failsafe");
failsafePlugin.setArtifactId("maven-failsafe-plugin");
groupMetadata.addPlugin(failsafePlugin);

// Access plugin list
List<Plugin> plugins = groupMetadata.getPlugins();
System.out.println("Number of plugins: " + plugins.size());

// Find plugin by prefix
for (Plugin plugin : plugins) {
    if ("compiler".equals(plugin.getPrefix())) {
        System.out.println("Found compiler plugin: " + plugin.getArtifactId());
        break;
    }
}

// Remove a plugin
groupMetadata.removePlugin(failsafePlugin);

// When user runs: mvn compiler:compile
// Maven resolves this to: org.apache.maven.plugins:maven-compiler-plugin

// Step 1: Look in org.apache.maven.plugins group metadata
Metadata groupMetadata = readGroupMetadata("org.apache.maven.plugins");

// Step 2: Find plugin with prefix "compiler"
Plugin resolvedPlugin = null;
for (Plugin plugin : groupMetadata.getPlugins()) {
    if ("compiler".equals(plugin.getPrefix())) {
        resolvedPlugin = plugin;
        break;
    }
}

// Step 3: Use resolved artifactId
if (resolvedPlugin != null) {
    String artifactId = resolvedPlugin.getArtifactId(); // "maven-compiler-plugin"
    // Maven can now load: org.apache.maven.plugins:maven-compiler-plugin
}

// Local metadata with some plugins
Metadata localMetadata = new Metadata();
localMetadata.setGroupId("org.apache.maven.plugins");

Plugin compilerPlugin = new Plugin();
compilerPlugin.setPrefix("compiler");
compilerPlugin.setArtifactId("maven-compiler-plugin");
localMetadata.addPlugin(compilerPlugin);

// Remote metadata with additional plugins
Metadata remoteMetadata = new Metadata();
remoteMetadata.setGroupId("org.apache.maven.plugins");

Plugin surefirePlugin = new Plugin();
surefirePlugin.setPrefix("surefire");
surefirePlugin.setArtifactId("maven-surefire-plugin");
remoteMetadata.addPlugin(surefirePlugin);

// Merge remote plugins into local metadata
boolean changed = localMetadata.merge(remoteMetadata);
if (changed) {
    // Local metadata now contains both compiler and surefire plugins
    System.out.println("Plugins merged successfully");
    System.out.println("Total plugins: " + localMetadata.getPlugins().size());
}