basebeantag.java

GridSphere 门户 提供一个基于 portlet 的高级开放源代码门户。GridSphere 是在欧盟提供基金的 GridLab 项目下开发的

/*
 * @author <a href="mailto:[e-mail]">Jason Novotny</a>
 * @version $Id: BaseBeanTag.java 4688 2006-03-29 06:13:00Z novotny $
 */
package org.gridsphere.provider.portletui.tags;

import org.gridsphere.portlet.impl.SportletProperties;
import org.gridsphere.provider.portletui.beans.TagBean;

import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.util.Enumeration;

/**
 * The abstract <code>BaseBeanTag</code> is a base class used by all UI tags that provides support for
 * a bean identifier and a flag for indicating whether JavaScript is enabled.
 */
public abstract class BaseBeanTag extends BodyTagSupport {

    protected String beanId = "";

    /**
     * Returns the bean identifier
     *
     * @return the bean identifier
     */
    public String getBeanId() {
        return beanId;
    }

    /**
     * Sets the bean identifier
     *
     * @param beanId the bean identifier
     */
    public void setBeanId(String beanId) {
        this.beanId = beanId;
    }

    public TagBean getTagBean() {
        //System.err.println("looking for bean: "  + getBeanKey());
        return (TagBean) pageContext.findAttribute(getBeanKey());
    }

    /**
     * Returns the unique bean key
     *
     * @return the unique bean key
     */
    protected String getBeanKey() {
        String cid = (String) pageContext.findAttribute(SportletProperties.COMPONENT_ID);
        String compId = (String) pageContext.findAttribute(SportletProperties.GP_COMPONENT_ID);
        String beanKey;
        if (compId == null) {
            beanKey = beanId + "_" + cid;
        } else {
            beanKey = compId + "%" + beanId + "_" + cid;
        }
        //System.err.println("in BaseBeanTag: getBeanKey(" + beanId + ") = " + beanKey);
        return beanKey;
    }

    /**
     * Prints out all request attributes. Used for debugging
     */
    public void debug() {
        Enumeration e = pageContext.getAttributeNamesInScope(PageContext.REQUEST_SCOPE);
        System.err.println("Printing attribues in request scope");
        while (e.hasMoreElements()) {
            System.err.println((String) e.nextElement());
        }
        e = pageContext.getAttributeNamesInScope(PageContext.SESSION_SCOPE);
        System.err.println("Printing attribues in session scope");
        while (e.hasMoreElements()) {
            System.err.println((String) e.nextElement());
        }
        e = pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
        System.err.println("Printing attribues in page scope");
        while (e.hasMoreElements()) {
            System.err.println((String) e.nextElement());
        }
        e = pageContext.getAttributeNamesInScope(PageContext.APPLICATION_SCOPE);
        System.err.println("Printing attribues in application scope");
        while (e.hasMoreElements()) {
            System.err.println((String) e.nextElement());
        }
    }

    protected String getUniqueId(String varName) {
        String uniqueId = (String) pageContext.getAttribute(varName, PageContext.REQUEST_SCOPE);

        // use a counter to continually increase form number to provide unique form name
        int ctr;
        if (uniqueId == null) {
            ctr = 1;
        } else {
            ctr = Integer.parseInt(uniqueId) + 1;
        }
        uniqueId = String.valueOf(ctr);
        pageContext.setAttribute(varName, uniqueId, PageContext.REQUEST_SCOPE);
        return uniqueId;
    }

}