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Java 1.6+ Library with tons of utility classes required in all projects
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/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.commons.error;

import java.io.Serializable;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.id.IHasID;
import com.helger.commons.state.IErrorIndicator;
import com.helger.commons.state.ISuccessIndicator;

/**
 * Interface representing a single error level.
 *
 * @author Philip Helger
 */
public interface IErrorLevel extends
                             IHasID ,
                             ISuccessIndicator,
                             IErrorIndicator,
                             ISeverityComparable ,
                             Serializable
{
  /**
   * @return The numeric level of this error level. Must be ≥ 0. The higher
   *         the numeric level, the higher the priority of the error level. So
   *         e.g. ERROR has a higher/larger/greater numerical level than
   *         WARNING.
   */
  @Nonnegative
  int getNumericLevel ();

  default boolean isSuccess ()
  {
    return isEqualSevereThan (EErrorLevel.SUCCESS);
  }

  default boolean isError ()
  {
    return isMoreOrEqualSevereThan (EErrorLevel.ERROR);
  }

  default boolean isEqualSevereThan (@Nonnull final IErrorLevel aErrorLevel)
  {
    return getNumericLevel () == aErrorLevel.getNumericLevel ();
  }

  default boolean isLessSevereThan (@Nonnull final IErrorLevel aErrorLevel)
  {
    return getNumericLevel () < aErrorLevel.getNumericLevel ();
  }

  default boolean isLessOrEqualSevereThan (@Nonnull final IErrorLevel aErrorLevel)
  {
    return getNumericLevel () <= aErrorLevel.getNumericLevel ();
  }

  default boolean isMoreSevereThan (@Nonnull final IErrorLevel aErrorLevel)
  {
    return getNumericLevel () > aErrorLevel.getNumericLevel ();
  }

  default boolean isMoreOrEqualSevereThan (@Nonnull final IErrorLevel aErrorLevel)
  {
    return getNumericLevel () >= aErrorLevel.getNumericLevel ();
  }

  default boolean isHighest ()
  {
    return this == EErrorLevel.HIGHEST;
  }

  @Nullable
  public static IErrorLevel getMostSevere (@Nullable final IErrorLevel aLevel1, @Nullable final IErrorLevel aLevel2)
  {
    if (aLevel1 == aLevel2)
      return aLevel1;
    if (aLevel1 == null)
      return aLevel2;
    if (aLevel2 == null)
      return aLevel1;
    return aLevel1.isMoreSevereThan (aLevel2) ? aLevel1 : aLevel2;
  }
}