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Bridges Apache Wicket with Select2 components

There is a newer version: 10.1.1

/*
 * Copyright 2012 Igor Vaynberg
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with
 * the License. You may obtain a copy of the License in the LICENSE file, or at:
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package org.wicketstuff.select2;

import org.apache.wicket.model.IModel;
import org.apache.wicket.util.convert.ConversionException;
import org.apache.wicket.util.string.AppendingStringBuffer;
import org.apache.wicket.util.string.Strings;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * Single-select Select2 component. Should be attached to a {@code } element.
 *
 * @param 
 *            type of choice object
 * @author igor
 */
public class Select2Choice extends AbstractSelect2Choice
{

	private static final long serialVersionUID = 1L;

	/**
	 * Constructor.
	 *
	 * @param id
	 */
	public Select2Choice(String id)
	{
		super(id);
	}

	/**
	 * Constructor.
	 *
	 * @param id
	 * @param model
	 */
	public Select2Choice(String id, IModel model)
	{
		super(id, model);
	}

	/**
	 * Constructor.
	 *
	 * @param id
	 * @param model
	 * @param provider
	 */
	public Select2Choice(String id, IModel model, ChoiceProvider provider)
	{
		super(id, model, provider);
	}

	@Override
	protected CharSequence createOptionsHtml(T currentValue) {
		final AppendingStringBuffer buffer = new AppendingStringBuffer();

		if (currentValue != null) {
			appendOptionHtml(buffer, currentValue);
		}

		return buffer;
	}

	/**
	 * Constructor.
	 *
	 * @param id
	 * @param provider
	 */
	public Select2Choice(String id, ChoiceProvider provider)
	{
		super(id, provider);
	}

    @Override
	protected final T convertValue(String[] value) throws ConversionException
	{
		if (value != null && value.length > 0 && !Strings.isEmpty(value[0]))
		{
			List ids = Collections.singletonList(value[0]);
			Collection choices = convertIdsToChoices(ids);
			Iterator it = choices.iterator();
			return it.hasNext() ? it.next() : null;
		}
		else
		{
			return null;
		}
	}
}