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Java 1.8+ Library with tons of utility classes required in all projects

There is a newer version: 11.1.10

/*
 * 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.statistics;

import javax.annotation.CheckForSigned;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.impl.ICommonsSet;

/**
 * Base interface for keyed statistic handlers
 *
 * @author Philip Helger
 */
public interface IStatisticsHandlerKeyed extends IStatisticsHandler
{
  /**
   * @return A collection of all keys that have a value assigned. Never
   *         null.
   */
  @Nonnull
  @ReturnsMutableCopy
  ICommonsSet  getAllKeys ();

  /**
   * Get the invocation count for a single key.
   *
   * @param sKey
   *        The key to be queried. May be null.
   * @return The invocation count for a single key or
   *         {@link com.helger.commons.CGlobal#ILLEGAL_UINT} if no such key
   *         exists
   */
  @CheckForSigned
  int getInvocationCount (@Nullable String sKey);
}