EveluateTag.java

package com.aggrepoint.winlet.jsp.site.taglib;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import com.aggrepoint.winlet.AuthorizationEngine;
import com.aggrepoint.winlet.ContextUtils;
import com.aggrepoint.winlet.site.SiteContext;
import com.aggrepoint.winlet.site.domain.Page;

/**
 * 
 * <ae:eval type="focus" page="page0" name="bbbb"/> <% if (bbbb.booleanValue())
 * { %>aaa<% } else { %>bbb<% } %>
 * 
 * @author Jiangming Yang (yangjm@gmail.com)
 */
public class EveluateTag extends TagSupport {
	static final long serialVersionUID = 0;

	String m_strType;

	String m_strPage;

	String m_strName;

	int m_iLevel;

	public EveluateTag() {
		m_strType = "";
		m_strName = null;
		m_strPage = null;
		m_iLevel = -1;
	}

	public void setType(String type) {
		m_strType = type;
	}

	public void setPage(String page) {
		m_strPage = page;
	}

	public void setLevel(int level) {
		m_iLevel = level;
	}

	public void setName(String name) {
		m_strName = name;
	}

	public int doStartTag() throws JspException {
		try {
			SiteContext sc = (SiteContext) pageContext.getRequest()
					.getAttribute(SiteContext.SITE_CONTEXT_KEY);
			AuthorizationEngine ap = ContextUtils
					.getAuthorizationEngine((HttpServletRequest) pageContext
							.getRequest());

			Page currentPage = sc.getPage();

			Object val = new Boolean(false);

			Page page = Utils.getPage(this, pageContext, m_strPage, m_iLevel);

			if (m_strType.equals("hassub")) { // 判断指定的页是否包含子页面
				if (page.getPages(ap, false, true, false).size() > 0)
					val = new Boolean(true);
			} else if (m_strType.equals("current")) { // 判断指定的页是否当前页
				if (currentPage == page)
					val = new Boolean(true);
			} else if (m_strType.equals("focus")) { // 判断指定的页是否当前页或当前页的直接上级页面
				while (currentPage != null
						&& currentPage.getParent() != currentPage
						&& currentPage != page)
					currentPage = currentPage.getParent();
				if (currentPage == page)
					val = new Boolean(true);
			} else if (m_strType.equals("first")) { // 用于在tree标记中，判断当前页面是否第一个页面
				TreeTag tt = (TreeTag) TagSupport.findAncestorWithClass(this,
						TreeTag.class);
				if (tt != null)
					if (tt.isFirst())
						val = new Boolean(true);
			} else if (m_strType.equals("last")) { // 用于在tree标记中，判断当前页面是否还有后续页面
				TreeTag tt = (TreeTag) TagSupport.findAncestorWithClass(this,
						TreeTag.class);
				if (tt != null)
					if (!tt.hasNext())
						val = new Boolean(true);
			} else if (m_strType.equals("canaccess")) { // 是否可以访问当前页。用于处理只能扩展访问但不能直接访问的页面
				if (ContextUtils.getAuthorizationEngine(
						(HttpServletRequest) pageContext.getRequest()).check(
						page, false) == null)
					val = new Boolean(true);
			} else if (m_strType.startsWith("data.")) { // 获取data
				val = page.getData(m_strType.substring(5));
			}

			pageContext.setAttribute(m_strName, val);
		} catch (Exception e) {
			throw new JspException(e.getMessage());
		}
		return SKIP_BODY;
	}
}