MultiCheckboxFormField.java

package ilarkesto.form;

import ilarkesto.base.StringProvider;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.fileupload.FileItem;

public class MultiCheckboxFormField<T> extends AFormField {

	private Set<T> value;

	private List<T> selectableItems;
	private StringProvider<T> itemTooltipProvider;

	public MultiCheckboxFormField(String name) {
		super(name);
	}

	public MultiCheckboxFormField<T> setItemTooltipProvider(StringProvider<T> itemTooltipProvider) {
		this.itemTooltipProvider = itemTooltipProvider;
		return this;
	}

	public StringProvider<T> getItemTooltipProvider() {
		return itemTooltipProvider;
	}

	public List<T> getSelectableItems() {
		return selectableItems;
	}

	public MultiCheckboxFormField<T> setSelectableItems(Collection<T> items) {
		this.selectableItems = items == null ? new ArrayList<T>() : new ArrayList<T>(items);
		return this;
	}

	public MultiCheckboxFormField<T> setValue(Set<T> value) {
		if (value == null) {
			this.value = null;
		} else {
			this.value = new HashSet<T>(value);
			this.value.retainAll(selectableItems);
		}
		return this;
	}

	public boolean isSelected(T item) {
		return value != null && value.contains(item);
	}

	public Set<T> getValue() {
		return value;
	}

	public String getValueAsString() {
		return value == null ? "0" : String.valueOf(value.size());
	}

	public void update(Map<String, String> data, Collection<FileItem> uploadedFiles) {
		value = new HashSet<T>();
		int index = 0;
		for (T item : selectableItems) {
			if (data.containsKey(getName() + '_' + index)) value.add(item);
			index++;
		}
	}

	public void validate() throws ValidationException {
		if (isRequired() && (value == null || value.size() == 0))
			throw new ValidationException("Hier ist eine Auswahl erforderlich.");
	}

	// --- dependencies ---

}