TimeZoneChooserValues.java

/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.pipeline.config;

import com.streamsets.pipeline.api.ChooserValues;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.TimeZone;

public class TimeZoneChooserValues implements ChooserValues {
  private static final List<String> VALUES = new ArrayList<String>();
  private static final List<String> LABELS = new ArrayList<String>();

  static {
    Set<String> seen = new HashSet<>();
    for (String tzId : TimeZone.getAvailableIDs()) {
      // skip id's that are like "Etc/GMT+01:00" because their display names are like "GMT-01:00", which is confusing
      if (!tzId.startsWith("Etc/GMT")) {
        if (!seen.contains(tzId)) {
          TimeZone tZone = TimeZone.getTimeZone(tzId);
          VALUES.add(tzId);
          LABELS.add(tZone.getDisplayName(false, TimeZone.SHORT) + " (" + tzId + ")");
          seen.add(tzId);
        }
      }
    }
  }

  @Override
  public String getResourceBundle() {
    return null;
  }

  @Override
  public List<String> getValues() {
    return VALUES;
  }

  @Override
  public List<String> getLabels() {
    return LABELS;
  }
}