ckan-metadata-publisher-widget/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/MetaDataFieldSkeleton.java

package org.gcube.portlets.widgets.ckandatapublisherwidget.client.ui;

import java.util.Date;
import java.util.List;

import org.gcube.portlets.widgets.ckandatapublisherwidget.client.events.CloseCreationFormEvent;
import org.gcube.portlets.widgets.ckandatapublisherwidget.client.events.CloseCreationFormEventHandler;
import org.gcube.portlets.widgets.ckandatapublisherwidget.client.ui.utils.GcubeDialogExtended;
import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.MetadataFieldWrapper;

import com.github.gwtbootstrap.client.ui.Button;
import com.github.gwtbootstrap.client.ui.CheckBox;
import com.github.gwtbootstrap.client.ui.ControlLabel;
import com.github.gwtbootstrap.client.ui.Controls;
import com.github.gwtbootstrap.client.ui.Icon;
import com.github.gwtbootstrap.client.ui.ListBox;
import com.github.gwtbootstrap.client.ui.Popover;
import com.github.gwtbootstrap.client.ui.TextArea;
import com.github.gwtbootstrap.client.ui.TextBox;
import com.github.gwtbootstrap.client.ui.constants.IconType;
import com.github.gwtbootstrap.datetimepicker.client.ui.DateTimeBox;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.SpanElement;
import com.google.gwt.dom.client.Style.Cursor;
import com.google.gwt.dom.client.Style.Display;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

public class MetaDataFieldSkeleton extends Composite{

	private static MetaDataFieldSkeletonUiBinder uiBinder = GWT
			.create(MetaDataFieldSkeletonUiBinder.class);

	interface MetaDataFieldSkeletonUiBinder extends
	UiBinder<Widget, MetaDataFieldSkeleton> {
	}

	@UiField Element mandatorySymbol;
	@UiField SpanElement name;
	@UiField SimplePanel elementPanel;
	@UiField FlowPanel noteFieldContainer;
	@UiField Popover noteFieldPopover;
	@UiField ControlLabel controlLabel;
	@UiField Controls controls;
	@UiField Icon infoIcon;
	@UiField FocusPanel focusPanelIconContainer;

	private static final String REGEX_IS_NUMBER = "[0-9]+[.]?[0-9]+";

	// the element that holds the value (it could be a checkbox, textbox or listbox, textarea, calendar, two calendars, more calendars)
	private Widget holder;

	// the field this object represents
	private MetadataFieldWrapper field;
	
	// the dialog box for this metadata
	private GcubeDialogExtended dialog;

	// save event bus reference
	private HandlerManager eventBus;

	// the date formatter(s) to use
	private DateTimeFormat format1 = DateTimeFormat.getFormat("yyyy-MM-dd");
	private DateTimeFormat format2 = DateTimeFormat.getFormat("yyyy-MM-dd hh:mm");

	// labels
	private static final String INSERT_TIME_INSTANT_LABEL = "Insert a time instant";
	private static final String INSERT_TIME_START_LABEL = "Insert a start time instant";
	private static final String INSERT_TIME_END_LABEL = "Insert an end time instant";

	// errors
	private static final String MANDATORY_ATTRIBUTE_MISSING = "a mandatory attribute cannot be empty";
	private static final String MALFORMED_ATTRIBUTE = " the inserted value has a wrong format";
	private static final String ADD_NEW_TIME_RANGE = "Add a new Time Range";
	private static final String DELETE_TIME_RANGE = "Delete this Time Range";

	// missing range value
	public static final String MISSING_RANGE_VALUE = "missing";
	private static final String INSERT_MISSING_VALUE = " one or more range values missing";
	private static final String INSERT_MISSING_VALUE_MANDATORY = " one or more range values missing in mandatory field(s)";

	// time range separator
	public static final String RANGE_SEPARATOR_START_END = "/";
	public static final String RANGE_SEPARATOR = ",";

	public MetaDataFieldSkeleton(final MetadataFieldWrapper field, HandlerManager eventBus) throws Exception{
		initWidget(uiBinder.createAndBindUi(this));

		// prepare information
		this.field = field;

		// event bus
		this.eventBus = eventBus;

		// bind
		bind();

		switch(field.getType()){

		case Boolean : 

			// its a checkbox
			holder = new CheckBox();

			if(field.getDefaultValue() != null)
				((CheckBox)holder).setValue(Boolean.valueOf(field.getDefaultValue()));
			break;

		case Text:	

			holder = new TextArea();

			if(field.getDefaultValue() != null)
				((TextArea)holder).setText(field.getDefaultValue());

			break;

		case Time:

			holder = new DateTimeBox();

			((DateTimeBox)holder).setAutoClose(true);
			((DateTimeBox)holder).setPlaceholder(INSERT_TIME_INSTANT_LABEL);

			//	check the formatter to be used
			DateTimeFormat formatter = checkFormatterToUse(field.getDefaultValue());
			((DateTimeBox)holder).setFormat(formatter.getPattern());

			if(field.getDefaultValue() != null && !field.getDefaultValue().isEmpty())
				((DateTimeBox)holder).setValue(formatter.parse(field.getDefaultValue()));
			else
				((DateTimeBox)holder).setValue(null);

			break;

		case Time_Interval:

			holder = new FlowPanel();

			DateTimeFormat formatterTimeInterval = checkFormatterToUse(field.getDefaultValue());

			// start and end range date
			DateTimeBox start = new DateTimeBox();
			DateTimeBox end = new DateTimeBox();
			start.setWidth("40%");
			start.getElement().getStyle().setMarginRight(10, Unit.PCT);
			end.setWidth("40%");

			// add two calendars
			((FlowPanel)holder).add(start);
			((FlowPanel)holder).add(end);

			start.setFormat(formatterTimeInterval.getPattern());
			end.setFormat(formatterTimeInterval.getPattern());

			start.setPlaceholder(INSERT_TIME_START_LABEL);
			end.setPlaceholder(INSERT_TIME_END_LABEL);

			if(field.getDefaultValue() != null && !field.getDefaultValue().isEmpty()){
				Date parsedTime = formatterTimeInterval.parse(field.getDefaultValue());
				start.setValue(parsedTime);
				end.setValue(parsedTime);
			}else{
				start.setValue(null);
				end.setValue(null);
			}

			break;

		case Times_ListOf: 

			holder = new FlowPanel();

			// start and end range date
			final VerticalPanel containerRanges = new VerticalPanel();
			containerRanges.setWidth("100%");
			FlowPanel panelFirstRange = new FlowPanel();
			DateTimeBox startFirstRange = new DateTimeBox();
			DateTimeBox endFirstRange = new DateTimeBox();
			startFirstRange.setPlaceholder(INSERT_TIME_START_LABEL);
			endFirstRange.setPlaceholder(INSERT_TIME_END_LABEL);
			startFirstRange.setWidth("40%");
			startFirstRange.getElement().getStyle().setMarginRight(10, Unit.PCT);
			endFirstRange.setWidth("40%");

			final DateTimeFormat formatterTimeIntervalList = checkFormatterToUse(field.getDefaultValue());

			startFirstRange.setFormat(formatterTimeIntervalList.getPattern());
			endFirstRange.setFormat(formatterTimeIntervalList.getPattern());

			if(field.getDefaultValue() != null && !field.getDefaultValue().isEmpty()){
				Date formattedDefaultValueListOf = formatterTimeIntervalList.parse(field.getDefaultValue());
				startFirstRange.setValue(formattedDefaultValueListOf);
				endFirstRange.setValue(formattedDefaultValueListOf);
			}else{
				startFirstRange.setValue(null);
				endFirstRange.setValue(null);
			}

			// Add more button
			Button addRangeButton = new Button();
			addRangeButton.setIcon(IconType.PLUS_SIGN);
			addRangeButton.setTitle(ADD_NEW_TIME_RANGE);

			addRangeButton.addClickHandler(new ClickHandler() {

				@Override
				public void onClick(ClickEvent event) {

					final FlowPanel newRange = new FlowPanel();
					DateTimeBox startNewRange = new DateTimeBox();
					DateTimeBox endNewRange = new DateTimeBox();

					startNewRange.setWidth("40%");
					startNewRange.getElement().getStyle().setMarginRight(10, Unit.PCT);
					endNewRange.setWidth("40%");
					endNewRange.getElement().getStyle().setMarginRight(2, Unit.PCT);

					startNewRange.setFormat(formatterTimeIntervalList.getPattern());
					endNewRange.setFormat(formatterTimeIntervalList.getPattern());

					startNewRange.setPlaceholder(INSERT_TIME_START_LABEL);
					endNewRange.setPlaceholder(INSERT_TIME_END_LABEL);

					if(field.getDefaultValue() != null && !field.getDefaultValue().isEmpty()){
						startNewRange.setValue(formatterTimeIntervalList.parse(field.getDefaultValue()));
						endNewRange.setValue(formatterTimeIntervalList.parse(field.getDefaultValue()));
					}else{
						startNewRange.setValue(null);
						endNewRange.setValue(null);
					}

					// delete button
					Button deleteRangeButton = new Button("", IconType.MINUS_SIGN, new ClickHandler() {

						@Override
						public void onClick(ClickEvent event) {

							newRange.removeFromParent();

						}
					});
					deleteRangeButton.setTitle(DELETE_TIME_RANGE);

					newRange.add(startNewRange);
					newRange.add(endNewRange);
					newRange.add(deleteRangeButton);
					containerRanges.add(newRange);

				}
			});

			// add calendars and plus sign
			panelFirstRange.add(startFirstRange);
			panelFirstRange.add(endFirstRange);
			containerRanges.add(panelFirstRange);

			// add the vertical panel first, then the button
			((FlowPanel)holder).add(containerRanges);
			((FlowPanel)holder).add(addRangeButton);

			break;

		case Number:

			holder = new TextBox();

			if(field.getDefaultValue() != null)
				((TextBox)holder).setText(field.getDefaultValue());

			break;

		case String:

			// it could be a listbox or a textbox according to the vocabulary fields
			if(field.getVocabulary() == null || field.getVocabulary().isEmpty()){

				// textbox
				holder = new TextBox();

				if(field.getDefaultValue() != null)
					((TextBox)holder).setText(field.getDefaultValue());

			}else{

				// listbox
				holder = new ListBox(field.isMultiSelection());

				// if it is not mandatory, add a disabled option
				if(!field.getMandatory()){
					((ListBox)holder).addItem("Select " + field.getFieldName());
					((ListBox)holder).setSelectedValue("Select " + field.getFieldName());
					((ListBox)holder).getElement().getElementsByTagName("option").getItem(0).setAttribute("disabled", "disabled");
				}

				// get vocabulary fields
				List<String> vocabulary = field.getVocabulary();

				for (String term : vocabulary) {

					((ListBox)holder).addItem(term);

				}

				// set default value
				if(field.getDefaultValue() != null)
					((ListBox)holder).setSelectedValue(field.getDefaultValue());

			}

			break;

		default: return;

		}

		// add custom css properties
		controls.addStyleName("form-controls-custom");
		controlLabel.addStyleName("form-control-label-custom");

		// save the name
		name.setInnerText(field.getFieldName() + ":");

		// check if it is mandatory
		if(!field.getMandatory())
			mandatorySymbol.getStyle().setDisplay(Display.NONE);

		// add to the elementPanel
		elementPanel.add(holder);

		// set holder width
		if(holder.getClass().equals(ListBox.class))
			holder.setWidth("96%");
		else
			holder.setWidth("95%");

		// set the notes, if any, and the popover
		if(field.getNote() != null && !field.getNote().isEmpty()){
			noteFieldPopover.setText(new HTML("<p style='color:initial'>" + field.getNote() +"</p>").getHTML());
			noteFieldPopover.setHeading(new HTML("<b>" + field.getFieldName() +"</b>").getHTML());
			infoIcon.getElement().getStyle().setCursor(Cursor.HELP);
			noteFieldPopover.setHtml(true);
			noteFieldContainer.setVisible(true);
		}else{
			noteFieldContainer.setVisible(false);
		}

		// add a resize handler to center the dialog box if it's not null
		Window.addResizeHandler(new ResizeHandler() {

			@Override
			public void onResize(ResizeEvent event) {

				if(dialog != null)
					dialog.center();

			}
		});

	}

	/**
	 * Check if we need to use format1 or format2
	 * @param defaultValue
	 * @return format2 is returned as default
	 */
	private DateTimeFormat checkFormatterToUse(String defaultValue) {
		if(defaultValue == null || defaultValue.isEmpty())
			return format2;
		else{
			try{
				format1.parse(defaultValue);
				return format1;
			}catch(Exception e){
				GWT.log("Unable to parse default value with format 1", e);
				return format2;
			}
		}
	}

	/**
	 * Bind on events
	 */
	private void bind() {

		// on close form
		eventBus.addHandler(CloseCreationFormEvent.TYPE, new CloseCreationFormEventHandler() {

			@Override
			public void onClose(CloseCreationFormEvent event) {

				if(dialog != null)
					dialog.hide();

			}
		});

	}

	@UiHandler("focusPanelIconContainer")
	void onInfoIconClick(ClickEvent c){

		if(dialog == null){

			// create the dialog box
			dialog = new GcubeDialogExtended(field.getFieldName(), field.getNote());

			// set as non modal
			dialog.setModal(false);
		}

		// else just show and center
		dialog.center();
		dialog.show();
	}

	/**
	 * Check if this field has valid values
	 * @return a string with the occurred error on error, null otherwise
	 */
	public String isFieldValueValid(){

		switch(field.getType()){

		case Boolean : 

			// nothing to validate
			return null;

		case Text:	

			String textAreaValue = getFieldCurrentValue();

			if(field.getMandatory()){

				if(!textAreaValue.trim().isEmpty())
					if(field.getValidator() == null || field.getValidator().isEmpty())
						return null; // no further check
					else return checkValidator(textAreaValue, field.getValidator()) ? null : MALFORMED_ATTRIBUTE;
				else return MANDATORY_ATTRIBUTE_MISSING;

			}else{ 

				if(textAreaValue.trim().isEmpty())
					return null;

				else return checkValidator(textAreaValue, field.getValidator()) ? null : MALFORMED_ATTRIBUTE;

			}

		case Time:

			String dateValue = getFieldCurrentValue();

			if(field.getMandatory()){
				if(dateValue == null || dateValue.isEmpty())
					return MANDATORY_ATTRIBUTE_MISSING;
			}
			return null;


		case Time_Interval:

			String dateValueInterval = getFieldCurrentValue();

			if(field.getMandatory()){
				if(dateValueInterval.contains(MISSING_RANGE_VALUE))
					return INSERT_MISSING_VALUE_MANDATORY; // there cannot be "missing" values here
				else
					return null;
			}else{

				String[] values = dateValueInterval.split(RANGE_SEPARATOR_START_END);

				if(values.length == 1)
					return null; // same instants
				else{

					if(values[0].equals(values[1]) && values[0].equals(MISSING_RANGE_VALUE))
						return null; // missing/missing

					if(!values[0].equals(MISSING_RANGE_VALUE) && !values[1].equals(MISSING_RANGE_VALUE))
						return null;

					return INSERT_MISSING_VALUE;
				}

			}

		case Times_ListOf: 

			String dateValuesInterval = getFieldCurrentValue();

			if(field.getMandatory()){
				if(dateValuesInterval.contains(MISSING_RANGE_VALUE)) // there cannot be "missing" values here
					return INSERT_MISSING_VALUE_MANDATORY;
				else
					return null;
			}else{

				String[] values = dateValuesInterval.split(RANGE_SEPARATOR);

				for (int i = 0; i < values.length; i++) {
					
					String[] splitSingleRange = values[i].split(RANGE_SEPARATOR_START_END);

					if(splitSingleRange.length == 1)
						continue; // same instants
					else{

						if(splitSingleRange[0].equals(splitSingleRange[1]) && splitSingleRange[0].equals(MISSING_RANGE_VALUE))
							continue; // missing/missing, it's ok

						if(!splitSingleRange[0].equals(MISSING_RANGE_VALUE) && !splitSingleRange[1].equals(MISSING_RANGE_VALUE)) // value/value is ok too
							continue;

						return INSERT_MISSING_VALUE; // something like missing/x or x/missing
					}
				}

				return null;
			}

		case Number:

			String numberValue = ((TextBox)holder).getValue();

			if(field.getMandatory()){

				if(!numberValue.trim().isEmpty())
					if(field.getValidator() == null || field.getValidator().isEmpty())
						return checkValidator(numberValue, REGEX_IS_NUMBER) ? null : MALFORMED_ATTRIBUTE;
					else return checkValidator(numberValue, field.getValidator()) ? null : MALFORMED_ATTRIBUTE;
				else return " a mandatory attribute cannot be empty";

			}else{

				if(numberValue.trim().isEmpty())
					return null;
				else {
					String validatorToUse  = field.getValidator() == null  || field.getValidator().isEmpty() ? REGEX_IS_NUMBER : field.getValidator(); 
					return checkValidator(numberValue, validatorToUse) ? null : MALFORMED_ATTRIBUTE;
				}
			}

		case String:

			// just handle the case of textbox 
			if(holder.getClass().equals(TextBox.class)){

				String textBoxValue = getFieldCurrentValue();
				if(field.getMandatory()){
					if(!textBoxValue.trim().isEmpty())
						if(field.getValidator() == null || field.getValidator().isEmpty())
							return null; // no further check
						else return checkValidator(textBoxValue, field.getValidator()) ? null : MALFORMED_ATTRIBUTE;
					else return " a mandatory attribute cannot be empty";

				}else{ 
					if(textBoxValue.trim().isEmpty())
						return null;
					else return checkValidator(textBoxValue, field.getValidator()) ? null : MALFORMED_ATTRIBUTE;
				}
			}
			else return null;

		default: return null;

		}
	}

	/**
	 * Check if value matches validator (regex). In case validator is null, true is returned.
	 * @param value
	 * @param validator
	 * @return true if validator is null OR value.matches(reges), false otherwise
	 */
	private boolean checkValidator(String value, String validator) {
		if(validator == null || validator.isEmpty())
			return true;
		else return value.matches(validator);
	}

	/**
	 * Returns the current value of the field (in case of multiselection Listbox returns 
	 * the values separated by column ','). In case of TimeInterval or TimeList see getTimeIntervalOrTimeListWithoutMissing()
	 * @return
	 */
	public String getFieldCurrentValue(){

		String toReturn = "";

		switch(field.getType()){

		case Boolean : 

			toReturn = ((CheckBox)holder).getValue().toString(); 
			break;

		case Text:	

			toReturn = ((TextArea)holder).getText();
			break;

		case Time:

			Date date = ((DateTimeBox)holder).getValue();
			if(date == null)
				return null;
			else{
				DateTimeFormat formatter = checkFormatterToUse(field.getDefaultValue());
				return formatter.format(date);
			}

		case Time_Interval:

			DateTimeBox init = (DateTimeBox)((FlowPanel)holder).getWidget(0);
			DateTimeBox end = (DateTimeBox)((FlowPanel)holder).getWidget(1);

			Date initDate = init.getValue();
			Date endDate = end.getValue();

			DateTimeFormat formatter = checkFormatterToUse(field.getDefaultValue());

			String initDateAsString = initDate == null ? MISSING_RANGE_VALUE : formatter.format(initDate);
			String endDateAsString = endDate == null ? MISSING_RANGE_VALUE : formatter.format(endDate);

			if(initDateAsString.equals(endDateAsString) && !initDateAsString.equals(MISSING_RANGE_VALUE))
				toReturn = formatter.format(initDate); // an instant
			else
				toReturn = initDateAsString + RANGE_SEPARATOR_START_END + endDateAsString;

			GWT.log("Time_Interval " + toReturn);

			break;

		case Times_ListOf: 

			// get container
			VerticalPanel containerRanges = (VerticalPanel)((FlowPanel)holder).getWidget(0);

			// get its children count
			int values = containerRanges.getWidgetCount();

			for (int i = 0; i < values; i++) {

				// get FlowPanel panel
				FlowPanel line = (FlowPanel)containerRanges.getWidget(i);
				DateTimeBox initRangeInLine = (DateTimeBox)line.getWidget(0);
				DateTimeBox endRangeInLine = (DateTimeBox)line.getWidget(1);
				DateTimeFormat formatterRange = checkFormatterToUse(field.getDefaultValue());
				String initRangeAsString = initRangeInLine.getValue() == null ? MISSING_RANGE_VALUE : formatterRange.format(initRangeInLine.getValue());
				String endRangeAsString = endRangeInLine.getValue() == null ? MISSING_RANGE_VALUE : formatterRange.format(endRangeInLine.getValue());

				if(initRangeAsString.equals(endRangeAsString) && !endRangeAsString.equals(MISSING_RANGE_VALUE))
					toReturn += (i == 0) ? initRangeAsString : 
						RANGE_SEPARATOR  + initRangeAsString; // an instant
				else
					toReturn += (i == 0) ? initRangeAsString + RANGE_SEPARATOR_START_END + endRangeAsString : 
						RANGE_SEPARATOR + initRangeAsString + RANGE_SEPARATOR_START_END + endRangeAsString;

			}

			break;

		case Number:
		case String:

			if(holder.getClass().equals(TextBox.class))
				toReturn = ((TextBox)holder).getText();
			else{// listbox case

				boolean first = true;

				// handle multiselected case
				for(int i = 0; i < ((ListBox)holder).getItemCount(); i++){
					if(((ListBox)holder).isItemSelected(i)){
						toReturn += first ? ((ListBox)holder).getItemText(i) : ", " + ((ListBox)holder).getItemText(i);
						first = false;
					}
				}

				// if it was not mandatory but there was no choice, returning empty string
				if(!field.getMandatory())
					if(toReturn.equals("Select " + field.getFieldName()))
						toReturn = "";
			}	

			break;

		default: break;

		}

		return toReturn;
	}

	/**
	 * Returns the current name of the field
	 * @return
	 */
	public String getFieldName(){

		return field.getFieldName();

	}

	/**
	 * Freeze this widget (after on create)
	 */
	public void freeze() {

		switch(field.getType()){

		case Boolean : 

			((CheckBox)holder).setEnabled(false);
			break;

		case Text:	

			((TextArea)holder).setEnabled(false);
			break;

		case Time:

			((DateTimeBox)holder).setEnabled(false);
			break;

		case Time_Interval:

			((DateTimeBox)((FlowPanel)holder).getWidget(0)).setEnabled(false);
			((DateTimeBox)((FlowPanel)holder).getWidget(1)).setEnabled(false);
			break;

		case Times_ListOf: 

			// get container
			VerticalPanel containerRanges = (VerticalPanel)((FlowPanel)holder).getWidget(0);

			// freeze the button too
			((Button)((FlowPanel)holder).getWidget(1)).setEnabled(false);

			// get its children count
			int values = containerRanges.getWidgetCount();

			for (int i = 0; i < values; i++) {

				// get FlowPanel panel
				FlowPanel line = (FlowPanel)containerRanges.getWidget(i);
				((DateTimeBox)line.getWidget(0)).setEnabled(false);
				((DateTimeBox)line.getWidget(1)).setEnabled(false);

			}

			break;

		case Number:

			((TextBox)holder).setEnabled(false);
			break;

		case String:

			if(holder.getClass().equals(ListBox.class))
				((ListBox)holder).setEnabled(false);
			else 
				((TextBox)holder).setEnabled(false);
			break;

		default: break;

		}
	}
	
	/**
	 * Use it to retrieve TimeInterval or TimeListOf after isValidField() invocation returned true (and only for these types!)
	 * @return
	 */
	public String getTimeIntervalOrTimeListWithoutMissing(){
		
		String currentValue = getFieldCurrentValue();
		
		switch(field.getType()){
		
		case Time_Interval:
			
			String tempCurrentValue = currentValue.replaceAll(MISSING_RANGE_VALUE, "").replaceAll(RANGE_SEPARATOR_START_END, "");
			if(tempCurrentValue.trim().equals(""))
				return "";
			else
				return currentValue;
			
		case Times_ListOf:
			
			String toReturn = "";
			
			String[] values = currentValue.split(RANGE_SEPARATOR);

			for (int i = 0; i < values.length; i++) {
				
				String[] splitSingleRange = values[i].split(RANGE_SEPARATOR_START_END);

				if(splitSingleRange.length == 1)
					toReturn += splitSingleRange + RANGE_SEPARATOR; // same instants
				else{

					if(splitSingleRange[0].equals(splitSingleRange[1]) && splitSingleRange[0].equals(MISSING_RANGE_VALUE))
						continue; // missing/missing, it's ok

					if(!splitSingleRange[0].equals(MISSING_RANGE_VALUE) && !splitSingleRange[1].equals(MISSING_RANGE_VALUE)) // value/value is ok too
						toReturn += splitSingleRange[0] + RANGE_SEPARATOR_START_END + splitSingleRange[1] + RANGE_SEPARATOR;
				}
			}
			
			if(toReturn.endsWith(RANGE_SEPARATOR))
				toReturn = toReturn.substring(0, toReturn.length() - 1);

			return toReturn;
		
		default: return null;
		
		}
	}
	
	/**
	 * Get the original MetadataFieldWrapper object
	 * @return
	 */
	public MetadataFieldWrapper getField() {
		return field;
	}

}