com.mylab.wicket.jpa.ui.pages.select2.Select2Choice.java Source code

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Here is the source code for com.mylab.wicket.jpa.ui.pages.select2.Select2Choice.java

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/*
 * 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 com.mylab.wicket.jpa.ui.pages.select2;

import java.util.Collections;
import java.util.Iterator;

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

/**
 * Single-select Select2 component. Should be attached to a {@code <input type='hidden'/>} element.
 *
 * @param <T>
 *            type of choice object
 * @author igor
 */
public class Select2Choice<T> extends AbstractSelect2Choice<T, T> {

    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<T> model) {
        super(id, model);
    }

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

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

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