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EPOS Database APIs useful to interact with EPOS Metadata Catalogue
There is a newer version: 2.5.21
package metadataapis;

import abstractapis.AbstractAPI;
import commonapis.VersioningStatusAPI;
import model.Category;
import model.CategoryScheme;
import org.epos.eposdatamodel.LinkedEntity;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.UUID;

public class CategorySchemeAPI extends AbstractAPI {

    public CategorySchemeAPI(String entityName, Class edmClass) {
        super(entityName, edmClass);
    }

    @Override
    public LinkedEntity create(org.epos.eposdatamodel.CategoryScheme obj) {

        List returnList = getDbaccess().getOneFromDB(
                obj.getInstanceId(),
                obj.getMetaId(),
                obj.getUid(),
                obj.getVersionId(),
                getEdmClass());

        if(!returnList.isEmpty()){
            obj.setInstanceId(returnList.get(0).getInstanceId());
            obj.setMetaId(returnList.get(0).getMetaId());
            obj.setUid(returnList.get(0).getUid());
            obj.setVersionId(returnList.get(0).getVersionId());
        }

        obj = (org.epos.eposdatamodel.CategoryScheme) VersioningStatusAPI.checkVersion(obj);

        CategoryScheme edmobj = new CategoryScheme();
        edmobj.setVersionId(obj.getVersionId());
        edmobj.setInstanceId(obj.getInstanceId());
        edmobj.setMetaId(obj.getMetaId());

        getDbaccess().updateObject(edmobj);

        edmobj.setUid(Optional.ofNullable(obj.getUid()).orElse(getEdmClass().getSimpleName()+"/"+UUID.randomUUID().toString()));
        edmobj.setName(Optional.ofNullable(obj.getTitle()).orElse(""));
        edmobj.setDescription(Optional.ofNullable(obj.getDescription()).orElse(""));
        edmobj.setCode(Optional.ofNullable(obj.getCode()).orElse(""));
        edmobj.setColor(Optional.ofNullable(obj.getColor()).orElse(""));
        edmobj.setHomepage(Optional.ofNullable(obj.getHomepage()).orElse(""));
        edmobj.setOrderitemnumber(Optional.ofNullable(obj.getOrderitemnumber()).orElse(""));
        edmobj.setLogo(Optional.ofNullable(obj.getLogo()).orElse(""));

        getDbaccess().updateObject(edmobj);

        return new LinkedEntity().entityType(entityName)
                .instanceId(edmobj.getInstanceId())
                .metaId(edmobj.getMetaId())
                .uid(edmobj.getUid());
    }

    @Override
    public org.epos.eposdatamodel.CategoryScheme retrieve(String instanceId) {
        CategoryScheme edmobj = (CategoryScheme) getDbaccess().getOneFromDBByInstanceId(instanceId, CategoryScheme.class).get(0);
        org.epos.eposdatamodel.CategoryScheme o = new org.epos.eposdatamodel.CategoryScheme();


        o.setInstanceId(edmobj.getInstanceId());
        o.setMetaId(edmobj.getMetaId());
        o.setUid(edmobj.getUid());
        o.setTitle(edmobj.getName());
        o.setDescription(edmobj.getDescription());
        o.setCode(edmobj.getCode());
        o.setHomepage(edmobj.getHomepage());
        o.setLogo(edmobj.getLogo());
        o.setColor(edmobj.getColor());
        o.setOrderitemnumber(edmobj.getOrderitemnumber());

        o = (org.epos.eposdatamodel.CategoryScheme) VersioningStatusAPI.retrieveVersion(o);

        return o;
    }

    @Override
    public List retrieveAll() {
        List list = getDbaccess().getAllFromDB(CategoryScheme.class);
        List returnList = new ArrayList<>();
        for(CategoryScheme item : list){
            returnList.add(retrieve(item.getInstanceId()));
        }
        return returnList;
    }

    @Override
    public LinkedEntity retrieveLinkedEntity(String instanceId) {
        CategoryScheme edmobj = (CategoryScheme) getDbaccess().getOneFromDBByInstanceId(instanceId, CategoryScheme.class).get(0);

        LinkedEntity o = new LinkedEntity();
        o.setInstanceId(edmobj.getInstanceId());
        o.setMetaId(edmobj.getMetaId());
        o.setUid(edmobj.getUid());
        o.setEntityType(EntityNames.CATEGORYSCHEME.name());

        return o;
    }
}