Examples of Migrate

eu.planets_project.services.migrate.Migrate

Migration This is the generic migration interface for digital object format conversion services. In Planets we have settled on the term Migration for this, but it should be noted that this is slightly inconsistent with the OAIS terminology. In OAIS terms, a service that implements this interface is providing a Transformation service. In contrast, OAIS Migration covers to a range of operations which exactly preserve the bitstream (e.g. Refresh) as well as those that do not (e.g. Transformation). Those other OAIS Migration operations cannot be mapped onto stateless services, as they explicitly involve managing copies of the bitstream (i.e. managing global state). Therefore, this misalignment of terminology does not cause a major problem within the Planets frameworks, as all other OAIS Migrations would actually be implemented at the Workflow level. Note that although this interface only maps digital objects one-to-one, the intension is that resources composed of multiple bitstreams should be contained as new digital object types, and so many-to-one, one-to-many, and many-to-many transformations can be implemented using this interface by defining suitable composite digital object types along with appropriate format URIs. A Migration Service: - Supports service description to facilitate discovery. - Allows multiple input formats and output formats to be dealt with be the same service. - Allows parameters to be discovered and submitted to control the migration. - Allows digital objects composed of more than one file/bitstream. - Allows Files/bitstreams passed by value OR by reference. @author Fabian Steeg (fabian.steeg@uni-koeln.de), Andrew Jackson

      try {
        url = new URL(URL_XCDLEXTRACTOR);
        
        Service service = Service.create(url, new QName(PlanetsServices.NS,
                Migrate.NAME));
          Migrate extractor = service.getPort(Migrate.class);
          
          //the service's input
          byte[] array = FileUtils.readFileToByteArray(f1);
          
          //the service call and it's result
            DigitalObject digitalObject = extractor.migrate(
                    new DigitalObject.Builder(Content.byValue(array))
                            .build(), null, null, null).getDigitalObject();
            byte[] results = IOUtils.toByteArray(digitalObject.getContent().getInputStream());
      String xcdl = new String(results,"UTF-8");

            service = Service.create(wsdlLocation, Migrate.QNAME);
        } catch(WebServiceException e) {
            throw new PlatoServiceException("Error creating web service.", e);
        }
        
        Migrate m = (Migrate) service.getPort(Migrate.class);
        
        // create digital object that contains our sample object
        DigitalObject dob = new DigitalObject.Builder( Content.byValue(sampleObject.getData().getData()) ).title("data").build();


        FormatRegistry formatRegistry = FormatRegistryFactory.getFormatRegistry();


        // create Planets URI from extension
        URI sourceFormat = formatRegistry.createExtensionUri(sampleObject.getFormatInfo().getDefaultExtension());
        
        URI targetFormat;
        try {
            targetFormat = new URI(action.getTargetFormat());
        } catch (URISyntaxException e) {
            throw new PlatoServiceException("Error in target format.", e);
        }
        
        List<Parameter> serviceParams = getParameters(action.getParamByName("settings"));
        
        if (serviceParams.size() <= 0) {
            serviceParams = null;
        }
        
        // perform migration
        MigrateResult result = m.migrate(dob, sourceFormat, targetFormat, serviceParams);


        MigrationResult migrationResult = new MigrationResult();
        migrationResult.setSuccessful((result != null) && (result.getDigitalObject() != null));


        if (migrationResult.isSuccessful()) {

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Examples of Migrate

Examples of eu.planets_project.services.migrate.Migrate

Examples of eu.planets_project.services.migrate.Migrate