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/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * 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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.engine;

/**
 * Immutable.
 */
public class PageId implements Comparable {
  private final int fileId;
  private final int pageNumber;

  public PageId(final int fileId, final int pageNumber) {
    this.fileId = fileId;
    this.pageNumber = pageNumber;
  }

  public int getFileId() {
    return fileId;
  }

  public int getPageNumber() {
    return pageNumber;
  }

  @Override
  public boolean equals(final Object o) {
    if (this == o)
      return true;
    if (o == null || getClass() != o.getClass())
      return false;

    final PageId pageId = (PageId) o;

    if (fileId != pageId.fileId)
      return false;
    return pageNumber == pageId.pageNumber;
  }

  @Override
  public int hashCode() {
    int result = fileId;
    result = 31 * result + pageNumber;
    return result;
  }

  @Override
  public String toString() {
    return "PageId(" + fileId + "/" + pageNumber + ")";
  }

  @Override
  public int compareTo(final PageId o) {
    if (o == this)
      return 0;

    if (fileId > o.fileId)
      return 1;
    else if (fileId < o.fileId)
      return -1;

    if (pageNumber > o.pageNumber)
      return 1;
    else if (pageNumber < o.pageNumber)
      return -1;
    return 0;
  }
}