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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.collection.impl;

import java.util.Collections;
import java.util.Map;
import java.util.SortedMap;
import java.util.function.Predicate;

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

import com.helger.commons.annotation.CodingStyleguideUnaware;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.CollectionHelper;
import com.helger.commons.collection.map.MapEntry;

/**
 * A special {@link SortedMap} based interface with extended functionality based
 * on {@link ICommonsMap}.
 *
 * @author Philip Helger
 * @param 
 *        Map key type
 * @param 
 *        Map value type
 */
public interface ICommonsSortedMap  extends SortedMap , ICommonsMap 
{
  /**
   * Create a new {@link CommonsTreeMap}.
   */
  @Override
  @Nonnull
  @ReturnsMutableCopy
  default  ICommonsSortedMap  createInstance ()
  {
    return new CommonsTreeMap <> ();
  }

  @Override
  @Nonnull
  @ReturnsMutableCopy
  default ICommonsSortedSet  copyOfKeySet ()
  {
    return new CommonsTreeSet <> (keySet ());
  }

  @Override
  @Nonnull
  @ReturnsMutableCopy
  default ICommonsSortedSet  copyOfKeySet (@Nullable final Predicate  aFilter)
  {
    if (aFilter == null)
      return copyOfKeySet ();
    final CommonsTreeSet  ret = new CommonsTreeSet <> ();
    CollectionHelper.findAll (keySet (), aFilter, ret::add);
    return ret;
  }

  @Override
  @Nonnull
  @ReturnsMutableCopy
  default ICommonsSortedSet > copyOfEntrySet ()
  {
    // This is contained, because "Map.Entry" instance may get reused internally
    final ICommonsSortedSet > ret = new CommonsTreeSet <> ();
    for (final Map.Entry  aEntry : entrySet ())
      ret.add (new MapEntry <> (aEntry));
    return ret;
  }

  @Override
  @Nullable
  default KEYTYPE getFirstKey (@Nullable final KEYTYPE aDefault)
  {
    return isEmpty () ? aDefault : firstKey ();
  }

  @Override
  @Nullable
  default VALUETYPE getFirstValue (@Nullable final VALUETYPE aDefault)
  {
    final KEYTYPE aKey = getFirstKey (null);
    return aKey == null ? aDefault : get (aKey);
  }

  @Nullable
  default KEYTYPE getLastKey ()
  {
    return getLastKey (null);
  }

  @Nullable
  default KEYTYPE getLastKey (@Nullable final KEYTYPE aDefault)
  {
    return isEmpty () ? aDefault : lastKey ();
  }

  @Nullable
  default VALUETYPE getLastValue ()
  {
    return getLastValue (null);
  }

  @Nullable
  default VALUETYPE getLastValue (@Nullable final VALUETYPE aDefault)
  {
    final KEYTYPE aKey = getLastKey (null);
    return aKey == null ? aDefault : get (aKey);
  }

  @Override
  @Nonnull
  @CodingStyleguideUnaware
  default SortedMap  getAsUnmodifiable ()
  {
    return Collections.unmodifiableSortedMap (this);
  }

  @Nonnull
  @ReturnsMutableCopy
  ICommonsSortedMap  getClone ();
}