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Amazon Web Services (AWS) Advanced JDBC Wrapper

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * 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 software.amazon.jdbc.util;

import java.util.List;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;
import software.amazon.jdbc.HostSpec;

public class Utils {
  public static boolean isNullOrEmpty(final List list) {
    return list == null || list.isEmpty();
  }

  public static String logTopology(final @Nullable List hosts) {
    return logTopology(hosts, null);
  }

  public static String logTopology(
      final @Nullable List hosts,
      final @Nullable String messagePrefix) {

    final StringBuilder msg = new StringBuilder();
    if (hosts == null) {
      msg.append("");
    } else {
      for (final HostSpec host : hosts) {
        if (msg.length() > 0) {
          msg.append("\n");
        }
        msg.append("   ").append(host == null ? "" : host);
      }
    }
    return (messagePrefix == null ? "" : messagePrefix)
        + Messages.get("Utils.topology", new Object[] {msg.toString()});
  }
}