this.versionScheme = versionScheme;
    }

    @Override
    public PluginVersionResult resolve(PluginVersionRequest request) throws PluginVersionResolutionException {
        PluginVersionResult result = resolveFromProject(request);

        if (result == null) {
            ConcurrentMap<Key, PluginVersionResult> cache = getCache(request);
            Key key = getKey(request);
            result = cache.get(key);

import org.apache.maven.plugin.version.PluginVersionResult;
import org.eclipse.aether.repository.ArtifactRepository;

/**
 */
public class PluginVersionResolverStub implements PluginVersionResolver {

    @Override
    public PluginVersionResult resolve(PluginVersionRequest request) throws PluginVersionResolutionException {
        return new PluginVersionResult() {
            @Override

 */
package org.apache.maven.plugin.version.internal;

import org.apache.maven.plugin.version.PluginVersionResult;
import org.eclipse.aether.repository.ArtifactRepository;

/**
 * Describes the result of a plugin version resolution request.
 *
 * @since 3.0
 */
class DefaultPluginVersionResult implements PluginVersionResult {

    private String version;

    private ArtifactRepository repository;