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Java 1.8+ Library with tons of utility classes required in all projects
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/*
 * Copyright (C) 2014-2022 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.log;

import java.io.Serializable;
import java.util.Iterator;

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

import com.helger.commons.annotation.OverrideOnDemand;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.impl.CommonsArrayList;
import com.helger.commons.collection.impl.ICommonsList;
import com.helger.commons.error.level.EErrorLevel;
import com.helger.commons.error.level.IErrorLevel;
import com.helger.commons.error.level.IHasErrorLevels;
import com.helger.commons.lang.IHasSize;
import com.helger.commons.state.EChange;
import com.helger.commons.state.IClearable;
import com.helger.commons.string.ToStringGenerator;

/**
 * Keeps a set of {@link LogMessage} objects in memory, offering an API similar
 * to SLF4J.
 *
 * @author Philip Helger
 */
@NotThreadSafe
public class InMemoryLogger implements IHasErrorLevels , IHasSize, IClearable
{
  private final ICommonsList  m_aMessages = new CommonsArrayList <> ();

  /**
   * Override this method to create a different LogMessage object or to filter
   * certain log messages.
   *
   * @param eErrorLevel
   *        Error level. Never null.
   * @param aMsg
   *        The message object. Never null.
   * @param t
   *        An optional exception. May be null.
   * @return The returned value. May be null in which case the
   *         message will not be logged.
   */
  @Nullable
  @OverrideOnDemand
  protected LogMessage createLogMessage (@Nonnull final IErrorLevel eErrorLevel,
                                         @Nonnull final Serializable aMsg,
                                         @Nullable final Throwable t)
  {
    return new LogMessage (eErrorLevel, aMsg, t);
  }

  /**
   * Callback method that is invoked after a message was added.
   *
   * @param aLogMessage
   *        The added log message. Never null.
   */
  @OverrideOnDemand
  protected void onAddLogMessage (@Nonnull final LogMessage aLogMessage)
  {}

  public void log (@Nonnull final IErrorLevel eErrorLevel, @Nonnull final Serializable aMsg)
  {
    log (eErrorLevel, aMsg, null);
  }

  public void log (@Nonnull final IErrorLevel eErrorLevel, @Nonnull final Serializable aMsg, @Nullable final Throwable t)
  {
    final LogMessage aLogMessage = createLogMessage (eErrorLevel, aMsg, t);
    if (aLogMessage != null)
    {
      m_aMessages.add (aLogMessage);
      onAddLogMessage (aLogMessage);
    }
  }

  public void error (@Nonnull final Serializable aMsg)
  {
    error (aMsg, null);
  }

  public void error (@Nonnull final Serializable aMsg, @Nullable final Throwable t)
  {
    log (EErrorLevel.ERROR, aMsg, t);
  }

  public void warn (@Nonnull final Serializable aMsg)
  {
    warn (aMsg, null);
  }

  public void warn (@Nonnull final Serializable aMsg, @Nullable final Throwable t)
  {
    log (EErrorLevel.WARN, aMsg, t);
  }

  public void info (@Nonnull final Serializable aMsg)
  {
    log (EErrorLevel.INFO, aMsg, null);
  }

  public void info (@Nonnull final Serializable aMsg, @Nullable final Throwable t)
  {
    log (EErrorLevel.INFO, aMsg, t);
  }

  public void success (@Nonnull final Serializable aMsg)
  {
    log (EErrorLevel.SUCCESS, aMsg, null);
  }

  public void success (@Nonnull final Serializable aMsg, @Nullable final Throwable t)
  {
    log (EErrorLevel.SUCCESS, aMsg, t);
  }

  @Nonnull
  @ReturnsMutableCopy
  public ICommonsList  getAllMessages ()
  {
    return m_aMessages.getClone ();
  }

  @Nonnull
  public Iterator  iterator ()
  {
    return m_aMessages.iterator ();
  }

  @Nonnegative
  public int size ()
  {
    return m_aMessages.size ();
  }

  public boolean isEmpty ()
  {
    return m_aMessages.isEmpty ();
  }

  @Nonnull
  public EChange removeAll ()
  {
    return m_aMessages.removeAll ();
  }

  @Override
  public String toString ()
  {
    return new ToStringGenerator (this).append ("messages", m_aMessages).getToString ();
  }
}