/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.intellij.vcs.log.graph.utils.impl;

import com.intellij.vcs.log.graph.utils.IntToIntMap;
import com.intellij.vcs.log.graph.utils.UpdatableIntToIntMap;
import org.jetbrains.annotations.NotNull;

public class IDIntToIntMap implements IntToIntMap {
  @NotNull public static final UpdatableIntToIntMap EMPTY = new EmptyIDIntToIntMap();

  private final int size;

  public IDIntToIntMap(int size) {
    this.size = size;
  }

  @Override
  public int shortSize() {
    return size;
  }

  @Override
  public int longSize() {
    return size;
  }

  @Override
  public int getLongIndex(int shortIndex) {
    return shortIndex;
  }

  @Override
  public int getShortIndex(int longIndex) {
    return longIndex;
  }

  private static class EmptyIDIntToIntMap extends IDIntToIntMap implements UpdatableIntToIntMap {

    public EmptyIDIntToIntMap() {
      super(0);
    }

    @Override
    public void update(int startLongIndex, int endLongIndex) {
      // do nothing
    }
  }
}
