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.List;

import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.MetadataFieldWrapper;

import com.github.gwtbootstrap.client.ui.CheckBox;
import com.github.gwtbootstrap.client.ui.ListBox;
import com.github.gwtbootstrap.client.ui.TextBox;
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.Display;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.InlineLabel;
import com.google.gwt.user.client.ui.SimplePanel;
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 InlineLabel noteField;

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

	// the field this object represents
	private MetadataFieldWrapper field;

	public MetaDataFieldSkeleton(MetadataFieldWrapper field) {
		initWidget(uiBinder.createAndBindUi(this));

		// prepare information
		this.field = field;

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

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

		if(field.getIsBoolean()){

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

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

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

		}else{

			// 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.getDefaulValue() != null)
					((TextBox)holder).setText(field.getDefaulValue());

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


			}else{

				// listbox
				holder = new ListBox();

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

				for (String term : vocabulary) {

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

				}

				// set default value
				((ListBox)holder).setSelectedValue(field.getDefaulValue());

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

			}

		}
		
		// set holder width
		holder.setWidth("90%");

		// set the notes, if any
		if(field.getNote() != null && !field.getNote().isEmpty()){
			noteField.setText(field.getNote());
			noteFieldContainer.setVisible(true);

		}else{

			noteFieldContainer.setVisible(false);
		}
	}

	/**
	 * Check if this field has a valid values
	 * @return
	 */
	public boolean isFieldValueValid() {
		
		String validator = field.getValidator();

		// if validator is not present and it is not a textbox
		if((validator == null || validator.isEmpty()) && !(holder.getClass().equals(TextBox.class) && field.getMandatory()))
			return true;

		// current value
		String value;

		// we validate only listbox and textbox
		if(holder.getClass().equals(ListBox.class))
			value = ((ListBox)holder).getSelectedItemText();
		else if(holder.getClass().equals(TextBox.class)){
			value = ((TextBox)holder).getText();
			
			// if there is not a validator...
			if(validator == null){
				if(value.isEmpty() && field.getMandatory())
					return false;
				else if(value.isEmpty() && !field.getMandatory())
					return true;
				else if(!value.isEmpty())
					return true;
			}
		}
		else
			return true; // it's a checkbox (the value doesn't matter)

		return value.matches(validator);

	}

	/**
	 * Returns the current value of the field
	 * @return
	 */
	public String getFieldCurrentValue(){

		String value;

		// we validate only listbox and textbox
		if(holder.getClass().equals(ListBox.class))
			value = ((ListBox)holder).getSelectedItemText();
		else if(holder.getClass().equals(TextBox.class))
			value = ((TextBox)holder).getText();
		else
			value = ((CheckBox)holder).getValue().toString();

		return value;
	}

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

		return field.getFieldName();

	}

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

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

	}

}