private PluginDescriptor lookupPluginDescriptor()

in src/main/java/org/apache/maven/plugins/help/DescribeMojo.java [287:340]
52 lines of code
9 McCabe index (conditional complexity)

    private PluginDescriptor lookupPluginDescriptor(PluginInfo pi) throws MojoExecutionException, MojoFailureException {
        Plugin forLookup = null;
        if (StringUtils.isNotEmpty(pi.getPrefix())) {
            try {
                forLookup = mojoDescriptorCreator.findPluginForPrefix(pi.getPrefix(), session);
            } catch (NoPluginFoundForPrefixException e) {
                throw new MojoExecutionException("Unable to find the plugin with prefix: " + pi.getPrefix(), e);
            }
        } else if (StringUtils.isNotEmpty(pi.getGroupId()) && StringUtils.isNotEmpty(pi.getArtifactId())) {
            forLookup = new Plugin();
            forLookup.setGroupId(pi.getGroupId());
            forLookup.setArtifactId(pi.getArtifactId());
        }
        if (forLookup == null) {
            String msg = "You must specify either: both 'groupId' and 'artifactId' parameters OR a 'plugin' parameter"
                    + " OR a 'cmd' parameter. For instance:" + LS
                    + "  # mvn help:describe -Dcmd=install" + LS
                    + "or" + LS
                    + "  # mvn help:describe -Dcmd=help:describe" + LS
                    + "or" + LS
                    + "  # mvn help:describe -Dplugin=org.apache.maven.plugins:maven-help-plugin" + LS
                    + "or" + LS
                    + "  # mvn help:describe -DgroupId=org.apache.maven.plugins -DartifactId=maven-help-plugin" + LS
                    + LS
                    + "Try 'mvn help:help -Ddetail=true' for more information.";
            throw new MojoFailureException(msg);
        }

        if (StringUtils.isNotEmpty(pi.getVersion())) {
            forLookup.setVersion(pi.getVersion());
        } else {
            try {
                DefaultPluginVersionRequest versionRequest = new DefaultPluginVersionRequest(forLookup, session);
                versionRequest.setPom(project.getModel());
                PluginVersionResult versionResult = pluginVersionResolver.resolve(versionRequest);
                forLookup.setVersion(versionResult.getVersion());
            } catch (PluginVersionResolutionException e) {
                throw new MojoExecutionException(
                        "Unable to resolve the version of the plugin with prefix: " + pi.getPrefix(), e);
            }
        }

        try {
            return pluginManager.getPluginDescriptor(
                    forLookup, project.getRemotePluginRepositories(), session.getRepositorySession());
        } catch (Exception e) {
            throw new MojoExecutionException(
                    "Error retrieving plugin descriptor for:" + LS + LS + "groupId: '"
                            + groupId + "'" + LS + "artifactId: '" + artifactId + "'" + LS + "version: '" + version
                            + "'" + LS
                            + LS,
                    e);
        }
    }