Paginated view

import com.axemble.vdoc.sdk.exceptions.ModuleException;
import com.axemble.vdoc.sdk.exceptions.SDKException;
import com.axemble.vdoc.sdk.interfaces.IProperty;
import com.axemble.vdoc.sdk.interfaces.IViewController;
import com.axemble.vdoc.sdk.interfaces.IWorkflow;
import com.axemble.vdoc.sdk.interfaces.IWorkflowInstance;
import com.axemble.vdoc.sdk.interfaces.runtime.INavigateContext;
import com.axemble.vdoc.sdk.providers.BaseViewProvider;
import com.axemble.vdp.ui.core.providers.IBasicViewProvider;
import com.axemble.vdp.ui.framework.composites.base.CtlAbstractView;
import com.axemble.vdp.ui.framework.composites.base.models.views.BasicViewModel;
import com.axemble.vdp.ui.framework.composites.base.models.views.ViewModelColumn;
import com.axemble.vdp.ui.framework.composites.base.models.views.ViewModelItem;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

public class DummyViewProvider extends BaseViewProvider implements IBasicViewProvider<IWorkflowInstance> {

    public class ViewParameters {
        public int getCountRowsPerPage() {
            return getView().getRowsPerPage();
        }

        public int getCurrentPageIndex() {
            return getView().getPageIndex();
        }

        public String getCurrentSortedColumn() {
            if (getView().getListView().getCurrentSortingColumn() != null) {
                return getView().getListView().getCurrentSortingColumn().getName();
            }
            return null;
        }

        public int getCurrentSortedColumnOrder() {
            return getView().getListView().getCurrentSortingColumn().getSortingOrder();
        }
    }

    /**
     * The default class logger
     */
    private static final com.axemble.vdoc.sdk.utils.Logger LOG = com.axemble.vdoc.sdk.utils.Logger.getLogger(DummyViewProvider.class);

    protected ViewParameters viewParameters = new ViewParameters();
    
    public DummyViewProvider(INavigateContext context, CtlAbstractView view) {
        super(context, view);
    }

    @Override
    public List<IWorkflowInstance> getVisibleObjects() {
        List<IWorkflowInstance> workflowInstances = new ArrayList<>();
        try {
            IViewController viewController = getWorkflowModule().getViewController(getWorkflowModule().getLoggedOnUserContext());
            viewController.setStart((viewParameters.getCurrentPageIndex() - 1) * viewParameters.getCountRowsPerPage());
            viewController.setCount(viewParameters.getCountRowsPerPage());
            if (viewParameters.getCurrentSortedColumn() != null) {
                viewController.setOrderBy(viewParameters.getCurrentSortedColumn(), getColumnTypeClass(viewParameters.getCurrentSortedColumn()), viewParameters.getCurrentSortedColumnOrder() == 1);
            }
            Collection<IWorkflowInstance> workflowInstancesResult = viewController.evaluate((IWorkflow) getWorkflowModule().getElementByProtocolURI("uri://vdoc/workflow/5"));
            if (workflowInstancesResult != null) {
                workflowInstances.addAll(workflowInstancesResult);
            }
        } catch (ModuleException e) {
            LOG.error(e);
            throw new SDKException(e);
        }
        return workflowInstances;
    }
    
    private Class getColumnTypeClass(String columnName) {
        BasicViewModel<IWorkflowInstance> basicViewModel = (BasicViewModel<IWorkflowInstance>) getModel();
        ViewModelColumn viewModelColumn = basicViewModel.getColumnByName(columnName);
        switch (viewModelColumn.getType()) {
            case ViewModelColumn.TYPE_FLOAT:
                return Float.class;
            case ViewModelColumn.TYPE_INTEGER:
                return Long.class;
            case ViewModelColumn.TYPE_STRING:
                return String.class;
            case ViewModelColumn.TYPE_TIMESTAMP:
                return Date.class;
        }
        return null;
    }

    @Override
    public ViewModelItem fetchLine(IWorkflowInstance iWorkflowInstance) {
        ViewModelItem viewModelItem = new ViewModelItem();
        viewModelItem.setKey(iWorkflowInstance.getProtocolURI());
        viewModelItem.setValue(IProperty.System.REFERENCE, iWorkflowInstance.getValue(IProperty.System.REFERENCE));
        viewModelItem.setValue(IProperty.System.TITLE, iWorkflowInstance.getValue(IProperty.System.TITLE));
        viewModelItem.setValue(IProperty.System.CREATION_DATE, iWorkflowInstance.getValue(IProperty.System.CREATION_DATE));
        viewModelItem.setValue(IProperty.System.CREATOR, iWorkflowInstance.getValue(IProperty.System.CREATOR));
        return viewModelItem;
    }

}