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/*
 * Copyright (C) 2018 The Guava Authors
 *
 * 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.google.common.collect;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import com.google.common.primitives.Ints;
import java.util.Collection;
import java.util.Map;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * An implementation of ImmutableMultiset backed by a JDK Map and a list of entries. Used to protect
 * against hash flooding attacks.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
final class JdkBackedImmutableMultiset extends ImmutableMultiset {
  private final Map delegateMap;
  private final ImmutableList> entries;
  private final long size;

  static  ImmutableMultiset create(Collection> entries) {
    @SuppressWarnings("unchecked")
    Entry[] entriesArray = entries.toArray(new Entry[0]);
    Map delegateMap = Maps.newHashMapWithExpectedSize(entriesArray.length);
    long size = 0;
    for (int i = 0; i < entriesArray.length; i++) {
      Entry entry = entriesArray[i];
      int count = entry.getCount();
      size += count;
      E element = checkNotNull(entry.getElement());
      delegateMap.put(element, count);
      if (!(entry instanceof Multisets.ImmutableEntry)) {
        entriesArray[i] = Multisets.immutableEntry(element, count);
      }
    }
    return new JdkBackedImmutableMultiset<>(
        delegateMap, ImmutableList.asImmutableList(entriesArray), size);
  }

  private JdkBackedImmutableMultiset(
      Map delegateMap, ImmutableList> entries, long size) {
    this.delegateMap = delegateMap;
    this.entries = entries;
    this.size = size;
  }

  @Override
  public int count(@Nullable Object element) {
    return delegateMap.getOrDefault(element, 0);
  }

  private transient ImmutableSet elementSet;

  @Override
  public ImmutableSet elementSet() {
    ImmutableSet result = elementSet;
    return (result == null) ? elementSet = new ElementSet(entries, this) : result;
  }

  @Override
  Entry getEntry(int index) {
    return entries.get(index);
  }

  @Override
  boolean isPartialView() {
    return false;
  }

  @Override
  public int size() {
    return Ints.saturatedCast(size);
  }
}