添加Paging

+<?php
+/**
+ * 分页基类
+ *
+ * example：
+ * <pre>
+ * use Hood\Paging;
+ * $paging = new Paging();
+ * $paging->setTotal(10)->setCursor(1);
+ * </pre>
+ *
+ * @name Paging
+ * @version 2.0 (2009-5-11 下午05:47:31)
+ * @author ZIP
+ * @since 1.0
+ */
+namespace Hood;
+class Paging {
+	
+	/**
+	 * 总分页数
+	 *
+	 * @var Integer
+	 */
+	private $total;
+	
+	/**
+	 * 每页记录数
+	 *
+	 * @var Integer
+	 */
+	private $size;
+	
+	/**
+	 * 当前页
+	 * @var Integer
+	 */
+	protected $currentPage = 1;
+	
+	/**
+	 * 光标
+	 *
+	 * @var Integer
+	 */
+	private $cursor = 0;
+	
+	/**
+	 * 当前页
+	 * @return Integer
+	 */
+	public function getCurrent() {
+		return $this->currentPage;
+	}
+	
+	/**
+	 * 设置当前页
+	 * @param Integer $pageNo
+	 * @return Paging
+	 */
+	public function setCurrent( $pageNo ) {
+		$cur = (int) intval($pageNo);
+		if ($cur <= 0) {
+			$cur = 1;
+		}
+		$this->currentPage = $cur;
+		return $this;
+	}
+	
+	/**
+	 * 下一页
+	 * @return Integer
+	 */
+	public function getNext() {
+		$pageNum = $this->getPageNum();
+		$current = $this->getCurrent();
+		return $current < $pageNum ? ($current + 1) : $pageNum;
+	}
+	
+	/**
+	 * 上一页
+	 * @return Integer
+	 */
+	public function getPrev() {
+		$current = $this->getCurrent();
+		return $current > 1 ? ($current - 1) : 1;
+	}
+	
+	/**
+	 * 取得记录开始的偏移量
+	 * @return Integer
+	 */
+	public function getOffset() {
+		$offset = $this->getSize() * abs($this->getCurrent() - 1);
+		if ($offset >= $this->getTotal()) {
+			$offset = 0;
+			if ($this->getTotal() > 0 && $this->getTotal() > $this->getSize()) {
+				$offset = $this->getSize() * abs($this->getPageNum() - 1);
+			}
+		}
+		return (int) abs($offset);
+	}
+	
+	/**
+	 * 设置总记录数
+	 *
+	 * @param Integer $total
+	 * @return Paging
+	 */
+	public function setTotal( $total ) {
+		$this->total = (int) intval($total);
+		return $this;
+	}
+	/**
+	 * 获取总数
+	 * @return Integer
+	 */
+	public function getTotal() {
+		return (int) intval($this->total);
+	}
+	
+	/**
+	 * 获取每页显示数
+	 * @return Integer
+	 */
+	public function getSize() {
+		return (int) intval($this->size);
+	}
+	
+	/**
+	 * 设置每页记录数
+	 *
+	 * @param Integer $size
+	 * @return Paging
+	 */
+	public function setSize( $size ) {
+		if ($size > 0) {
+			$this->size = (int) intval($size);
+		}
+		return $this;
+	}
+	
+	/**
+	 * 获取起始数
+	 * @return Integer
+	 **/
+	public function getStarting() {
+		return $this->getOffset();
+	}
+	
+	/**
+	 * 获取终点数
+	 * @return Integer
+	 **/
+	public function getEnding() {
+		return $this->getOffset() + $this->getSize();
+	}
+	
+	/**
+	 * 光标
+	 *
+	 * @return Integer
+	 */
+	public function getCursor() {
+		return $this->cursor;
+	}
+	
+	/**
+	 * 设置光标
+	 *
+	 * @param Integer $cursor
+	 * @return Paging
+	 */
+	public function setCursor( $cursor ) {
+		$this->cursor = intval($cursor);
+		return $this;
+	}
+	
+	/**
+	 * 取得总分页数
+	 *
+	 * @return Integer
+	 */
+	public function getPageNum() {
+		if ($this->getSize() == 0) {
+			return 0;
+		}
+		return ceil($this->getTotal() / $this->getSize());
+	}
+}
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