public void scan()

in indexer-core/src/main/java/org/apache/maven/index/DefaultNexusIndexer.java [269:321]
46 lines of code
6 McCabe index (conditional complexity)

    public void scan(
            final IndexingContext context,
            final String fromPath,
            final ArtifactScanningListener listener,
            final boolean update)
            throws IOException {
        final File repositoryDirectory = context.getRepository();
        if (repositoryDirectory == null) {
            // nothing to scan
            return;
        }

        if (!repositoryDirectory.exists()) {
            throw new IOException("Repository directory " + repositoryDirectory + " does not exist");
        }

        // always use temporary context when reindexing
        final File tmpDir = Files.createTempDirectory(context.getId() + "-tmp").toFile();
        IndexingContext tmpContext = null;
        try {
            final FSDirectory directory = FSDirectory.open(tmpDir.toPath());
            if (update) {
                IndexUtils.copyDirectory(context.getIndexDirectory(), directory);
            }
            tmpContext = new DefaultIndexingContext(
                    context.getId() + "-tmp", //
                    context.getRepositoryId(), //
                    context.getRepository(), //
                    directory, //
                    context.getRepositoryUrl(), //
                    context.getIndexUpdateUrl(), //
                    context.getIndexCreators(), //
                    true);

            scanner.scan(new ScanningRequest(
                    tmpContext, //
                    new DefaultScannerListener(
                            tmpContext, indexerEngine,
                            update, listener),
                    fromPath));

            tmpContext.updateTimestamp(true);
            context.replace(tmpContext.getIndexDirectory());
        } catch (Exception ex) {
            throw new IOException("Error scanning context " + context.getId() + ": " + ex, ex);
        } finally {
            if (tmpContext != null) {
                tmpContext.close(true);
            }

            FileUtils.deleteDirectory(tmpDir);
        }
    }