protected UpdateScmResult executeUpdateCommand()

in maven-scm-providers/maven-scm-provider-local/src/main/java/org/apache/maven/scm/provider/local/command/update/LocalUpdateCommand.java [50:121]
54 lines of code
13 McCabe index (conditional complexity)

    protected UpdateScmResult executeUpdateCommand(ScmProviderRepository repo, ScmFileSet fileSet, ScmVersion version)
            throws ScmException {
        LocalScmProviderRepository repository = (LocalScmProviderRepository) repo;

        if (version != null) {
            throw new ScmException("The local scm doesn't support tags.");
        }

        File root = new File(repository.getRoot());

        String module = repository.getModule();

        File source = new File(root, module);

        File baseDestination = fileSet.getBasedir();

        if (!baseDestination.exists()) {
            throw new ScmException("The working directory doesn't exist (" + baseDestination.getAbsolutePath() + ").");
        }

        if (!root.exists()) {
            throw new ScmException("The base directory doesn't exist (" + root.getAbsolutePath() + ").");
        }

        if (!source.exists()) {
            throw new ScmException("The module directory doesn't exist (" + source.getAbsolutePath() + ").");
        }

        if (!baseDestination.exists() && !baseDestination.isDirectory()) {
            throw new ScmException("The destination directory isn't a directory or doesn't exist ("
                    + baseDestination.getAbsolutePath() + ").");
        }

        List<ScmFile> updatedFiles;

        try {
            if (logger.isInfoEnabled()) {
                logger.info("Updating '" + baseDestination.getAbsolutePath() + "' from '" + source.getAbsolutePath()
                        + "'.");
            }

            List<File> fileList = FileUtils.getFiles(source.getAbsoluteFile(), "**", null);
            updatedFiles = update(source, baseDestination, fileList);

            // process deletions in repository
            LocalScmMetadataUtils metadataUtils = new LocalScmMetadataUtils();
            LocalScmMetadata originalMetadata = metadataUtils.readMetadata(baseDestination);
            if (originalMetadata != null) {
                LocalScmMetadata newMetadata = metadataUtils.buildMetadata(source);
                for (Iterator<String> it =
                                originalMetadata.getRepositoryFileNames().iterator();
                        it.hasNext(); ) {
                    String filename = it.next();
                    if (!newMetadata.getRepositoryFileNames().contains(filename)) {
                        File localFile = new File(baseDestination, filename);
                        if (localFile.exists()) {
                            localFile.delete();
                            updatedFiles.add(new ScmFile("/" + filename, ScmFileStatus.UPDATED));
                        }
                    }
                }
            }

            // rewrite metadata file
            metadataUtils.writeMetadata(baseDestination, metadataUtils.buildMetadata(source));

        } catch (IOException ex) {
            throw new ScmException("Error while checking out the files.", ex);
        }

        return new LocalUpdateScmResult(null, updatedFiles);
    }