Java example of how to write a very basic OMERO importer (see https://www.openmicroscopy.org/community/viewtopic.php?f=6&t=1062)

simpler_importer.java

import ome.formats.OMEROMetadataStoreClient;
import ome.formats.importer.IObservable;
import ome.formats.importer.IObserver;
import ome.formats.importer.ImportCandidates;
import ome.formats.importer.ImportConfig;
import ome.formats.importer.ImportContainer;
import ome.formats.importer.ImportEvent;
import static ome.formats.importer.ImportEvent.IMPORT_DONE;
import ome.formats.importer.ImportLibrary;
import ome.formats.importer.OMEROWrapper;
import ome.formats.importer.cli.ErrorHandler;

public class simple_importer {

    public static ImportConfig config(String[] args) throws Exception {

        try {
            final String host = args[0];
            final Integer port = Integer.valueOf(args[1]);
            final String username = args[2];
            final String password = args[3];
            final Long datasetId = Long.valueOf(args[4]);
            final String atLeastOneFile = args[5];

            final ImportConfig config = new ImportConfig();
            config.email.set("");
            config.sendFiles.set(true);
            config.sendReport.set(false);
            config.contOnError.set(false);
            config.debug.set(false);
            config.hostname.set(host);
            config.port.set(port);
            config.username.set(username);
            config.password.set(password);
            config.targetClass.set("omero.model.Dataset");
            config.targetId.set(datasetId);

            return config;

        } catch (Exception e) {
            System.err.println("Usage: simple_importer host port user pass id file1 [file2 ...]");
            System.err.println("---------------------------------------------------------------");
            throw e;
        }

    }

    public static void main(String[] args) throws Exception {

        ImportConfig config = config(args);
        OMEROMetadataStoreClient store = config.createStore();

        final String[] paths = new String[args.length-5];
        System.arraycopy(args, 5, paths, 0, args.length-5);

        try {
            OMEROWrapper reader = new OMEROWrapper(config);
            ImportLibrary library = new ImportLibrary(store, reader);
            ErrorHandler handler = new ErrorHandler(config);

            IObserver status = new IObserver() {
                public void update(IObservable importLibrary, ImportEvent event) {
                    if (event instanceof IMPORT_DONE) {
                        IMPORT_DONE ev = (IMPORT_DONE) event;
                        System.err.println("Imported pixels:");
                        for (omero.model.Pixels p : ev.pixels) {
                            System.out.println(p.getId().getValue());
                        }
                    }
                }
            };
            library.addObserver(status);

            ImportCandidates candidates = new ImportCandidates(reader, paths, handler);
            boolean success = library.importCandidates(config, candidates);
            if (!success) {
                System.err.println("Failed");
            }
        } finally {
            store.logout();
        }
    }
}