pageagent.java

struts+spring+hibernate自创框架

package com.pegasus.framework.component.taglib.html.pager;

import java.io.Serializable;

public class PageAgent implements Serializable {

	private static final long serialVersionUID = 1L;

	private static final int DEFAULT_FETCH_SIZE = 10;

	private static final int DEFAULT_PAGENO = 1;

	private int fetchSize;

	private int pageNo;

	private int totalPageCount;

	private int totalObjectCount;

	public PageAgent() {
		this(1, 10);
	}

	public PageAgent(int pageNo) {
		this(pageNo, 10);
	}

	public PageAgent(int pageNo, int fetchSize) {
		totalObjectCount = 10;
		setFetchSize(fetchSize);
		setPageNo(pageNo);
	}

	public int getFetchSize() {
		return fetchSize;
	}

	public void setFetchSize(int fetchSize) {
		this.fetchSize = fetchSize >= 1 ? fetchSize : 1;
	}

	public int getPageNo() {
		return pageNo;
	}

	public void setPageNo(int pageNo) {
		this.pageNo = pageNo >= 1 ? pageNo : 1;
	}

	public int getTotalObjectCount() {
		return totalObjectCount;
	}

	public void setTotalObjectCount(int totalObjectCount) {
		this.totalObjectCount = totalObjectCount;
	}

	public int getTotalPageCount() {
		calculatePage();
		return totalPageCount;
	}

	public boolean isFirstPage() {
		return pageNo == 1;
	}

	public boolean getIsFirstPage() {
		return isFirstPage();
	}

	public PageAgent moveToFirstPage() {
		return jumpToPage(1);
	}

	public boolean isLastPage() {
		return pageNo == getTotalPageCount();
	}

	public boolean getIsLastPage() {
		return isLastPage();
	}

	public PageAgent moveToLastPage() {
		return jumpToPage(getTotalPageCount());
	}

	public boolean hasNextPage() {
		return pageNo < getTotalPageCount();
	}

	public boolean getHasNextPage() {
		return hasNextPage();
	}

	public PageAgent moveToNextPage() {
		int nextPageNo = pageNo + 1;
		return jumpToPage(nextPageNo);
	}

	public boolean hasPrecedingPage() {
		return pageNo > 1;
	}

	public boolean getHasPrecedingPage() {
		return hasPrecedingPage();
	}

	public PageAgent moveToPrecedingPage() {
		int nextPageNo = pageNo - 1;
		return jumpToPage(nextPageNo);
	}

	public int getFirstObjectIndexOfResult() {
		return (pageNo - 1) * fetchSize;
	}

	private void calculatePage() {
		if (totalObjectCount == 0) {
			totalPageCount = 0;
		} else {
			totalPageCount = totalObjectCount / fetchSize;
			int d = totalObjectCount % fetchSize;
			if (d > 0)
				totalPageCount++;
		}
	}

	public PageAgent jumpToPage(int destPageNo) {
		PageAgent pageAgent = new PageAgent(destPageNo, fetchSize);
		pageAgent.setTotalObjectCount(totalObjectCount);
		return pageAgent;
	}

	public int hashCode() {
		return 23;
	}

	public String toString() {
		return "fetchSize=" + String.valueOf(fetchSize) + ";pageNo=" + String.valueOf(pageNo);
	}

}