Adds fist part of "Distribution" on RDA export model.

dmp-backend/web/src/main/java/eu/eudat/models/data/rda/DatasetDistributionRDAExportModel.java

 package eu.eudat.models.data.rda;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
 import java.util.List;
 
 public class DatasetDistributionRDAExportModel {
 	private String access_url;
 	private String available_till;
-	private int byte_size;
+	private String byte_size;
 	private String data_access; // Allowed values: open / shared / closed
 	private String description;
 	private String download_url;
@@ -28,10 +30,10 @@ public class DatasetDistributionRDAExportModel {
 		this.available_till = available_till;
 	}
 
-	public int getByte_size() {
+	public String getByte_size() {
 		return byte_size;
 	}
-	public void setByte_size(int byte_size) {
+	public void setByte_size(String byte_size) {
 		this.byte_size = byte_size;
 	}
 
@@ -84,38 +86,8 @@ public class DatasetDistributionRDAExportModel {
 		this.title = title;
 	}
 
-	public DatasetDistributionRDAExportModel fromDataModel(String key, Object value) {
-		DatasetDistributionRDAExportModel distributionModel = new DatasetDistributionRDAExportModel();
-		switch (key) {
-			case "access_url":
-				distributionModel.setAccess_url(value.toString());
-				break;
-			case "available_till":
-				distributionModel.setAvailable_till(value.toString());
-				break;
-			case "byte_size":
-				try { distributionModel.setByte_size(Integer.parseInt(value.toString())); }
-				catch (NumberFormatException e) { e.printStackTrace(); }
-				break;
-			case "data_access":
-				distributionModel.setData_access(value.toString());
-				break;
-			case "description":
-				distributionModel.setDescription(value.toString());
-				break;
-			case "download_url":
-				distributionModel.setDownload_url(value.toString());
-				break;
-			case "format":
-				break;
-			case "host":
-				break;
-			case "license":
-				break;
-			case "title":
-				distributionModel.setTitle(value.toString());
-				break;
-		}
-		return distributionModel;
+	@JsonIgnore
+	public boolean isValid() {
+		return title != null || data_access != null;
 	}
 }

dmp-backend/web/src/main/java/eu/eudat/models/data/rda/DatasetRDAExportModel.java

@@ -194,6 +194,9 @@ public class DatasetRDAExportModel {
 		/*--------- Building data_quality_assurance. ---------*/
 		datasetRDAExportModel.setData_quality_assurance(buildDataQualityAssurance(datasetDescriptionJson, templateIdsToValues, dataset.getProfile().getDefinition()));
 
+		/*--------- Building distribution. ---------*/
+		datasetRDAExportModel.setDistribution(buildDistribution(datasetDescriptionJson, templateIdsToValues, dataset.getProfile().getDefinition()));
+
 		/*--------- Building keywords. ---------*/
 		datasetRDAExportModel.setKeyword(buildKeywords(datasetDescriptionJson, templateIdsToValues, dataset.getProfile().getDefinition()));
 
@@ -232,6 +235,32 @@ public class DatasetRDAExportModel {
 		return dataQualityAssuranceList;
 	}
 
+	private List<DatasetDistributionRDAExportModel> buildDistribution(JSONObject datasetDescriptionJson, Map<String, Object> templateIdsToValues, String datasetProfileDefinition) {
+		DatasetDistributionRDAExportModel distributionModel = new DatasetDistributionRDAExportModel();
+		distributionModel.setAccess_url(buildSingleProperties("dataset.distribution.access_url", datasetDescriptionJson, templateIdsToValues));
+		distributionModel.setAvailable_till(buildSingleProperties("dataset.distribution.available_till", datasetDescriptionJson, templateIdsToValues));
+		distributionModel.setByte_size(buildSingleProperties("dataset.distribution.byte_size", datasetDescriptionJson, templateIdsToValues));
+		distributionModel.setData_access(buildSingleProperties("dataset.distribution.data_access", datasetDescriptionJson, templateIdsToValues));
+		distributionModel.setDescription(buildSingleProperties("dataset.distribution.description", datasetDescriptionJson, templateIdsToValues));
+		distributionModel.setDownload_url(buildSingleProperties("dataset.distribution.download_url", datasetDescriptionJson, templateIdsToValues));
+		distributionModel.setTitle(buildSingleProperties("dataset.distribution.title", datasetDescriptionJson, templateIdsToValues));
+
+		/*--------- Building format. ---------*/
+
+
+		// We currently support the return of only one distribution.
+		List<DatasetDistributionRDAExportModel> distributionList = new LinkedList<>();
+		if (distributionModel.isValid()) {
+			distributionList.add(distributionModel);
+		} else {
+			DatasetDistributionRDAExportModel model = new DatasetDistributionRDAExportModel();
+			model.setDescription("Distribution data was not valid");
+			distributionList.add(model);
+		}
+
+		return distributionList;
+	}
+
 	private List<String> buildKeywords(JSONObject datasetDescriptionJson, Map<String, Object> templateIdsToValues, String datasetProfileDefinition) {
 		List<RdaField> keywordFields = getRDAFieldsFromJson(datasetDescriptionJson, new String[]{"dataset.keyword"}, datasetProfileDefinition);
 		for (RdaField rdaField : keywordFields) {