EmptyChoiceProvider.java

/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License 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.apache.isis.viewer.wicket.ui.components.widgets.select2.providers;

import java.util.Collection;

import org.apache.wicket.ajax.json.JSONException;
import org.apache.wicket.ajax.json.JSONWriter;
import org.wicketstuff.select2.ChoiceProvider;
import org.wicketstuff.select2.Response;

import org.apache.isis.viewer.wicket.model.mementos.ObjectAdapterMemento;

public class EmptyChoiceProvider extends ChoiceProvider<ObjectAdapterMemento> {

    public static final EmptyChoiceProvider INSTANCE = new EmptyChoiceProvider();

    @Override
    public String getDisplayValue(ObjectAdapterMemento object) {
        return null;
    }

    @Override
    public String getIdValue(ObjectAdapterMemento object) {
        return null;
    }

    @Override
    public void query(String term, int page, Response<ObjectAdapterMemento> response) {
    }

    @Override
    public void toJson(ObjectAdapterMemento choice, JSONWriter writer) throws JSONException {
    }

    @Override
    public Collection<ObjectAdapterMemento> toChoices(Collection<String> ids) {
        return null;
    }
}