IntegerListBox.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed 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.kaaproject.kaa.server.admin.client.mvp.view.widget;

import com.google.gwt.text.shared.Renderer;
import com.google.gwt.user.client.ui.ValueListBox;

import org.kaaproject.kaa.server.admin.client.util.Utils;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

public class IntegerListBox extends ValueListBox<Integer> {

  public IntegerListBox() {
    super(new IntegerRenderer());
  }

  /**
   * Reset.
   */
  public void reset() {
    List<Integer> emptyList = Collections.emptyList();
    setValue(null);
    setAcceptableValues(emptyList);
  }

  static class IntegerRenderer implements Renderer<Integer> {

    @Override
    public String render(Integer object) {
      if (object != null) {
        if (object == Integer.MAX_VALUE) {
          return Utils.constants.infinite();
        } else {
          return object.toString();
        }
      } else {
        return "";
      }
    }

    @Override
    public void render(Integer object, Appendable appendable)
        throws IOException {
      appendable.append(render(object));
    }
  }
}