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/*
 * Copyright (C) 2005, The Beangle Software.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.beangle.commons.collection.page

/** 分页对象
  *
  * @author chaostone
  */
class SinglePage[E](val pageIndex: Int, val pageSize: Int, val totalItems: Int, val items: collection.Seq[E]) extends Page[E] {

  def totalPages: Int = {
    if totalItems < pageSize then 1
    else
      val remainder = totalItems % pageSize
      val quotient = totalItems / pageSize
      if (0 == remainder) quotient else quotient + 1
  }

  def hasNext: Boolean = totalPages > pageIndex

  def hasPrevious: Boolean = pageIndex > 1

  def next(): Page[E] = this

  def previous(): Page[E] = this

  def moveTo(pageIndex: Int): Page[E] = this

  def apply(index: Int): E = items(index)

  def length: Int = items.size

  def iterator: Iterator[E] = items.iterator
}