Example usage for javax.servlet.jsp JspContext getAttributeNamesInScope

Introduction

In this page you can find the example usage for javax.servlet.jsp JspContext getAttributeNamesInScope.

Prototype

abstract public Enumeration<String> getAttributeNamesInScope(int scope);

Source Link

Document

Enumerate all the attributes in a given scope.

Usage

From source file:org.shredzone.commons.taglib.proxy.AbstractTagProxy.java

/**
 * Gets the {@link BeanFactory} from the given {@link JspContext}. The default
 * implementation automagically finds a {@link BeanFactory} that was previously set by
 * a {@link FrameworkServlet}. The result is cached.
 *
 * @param jspContext//  w w  w .j a  v a2  s  .co  m
 *            {@link JspContext} to be used
 * @return {@link BeanFactory} found
 */
@SuppressWarnings("unchecked")
protected BeanFactory getBeanFactory(JspContext jspContext) {
    Object bfCache = jspContext.getAttribute(TAGPROXY_BEANFACTORY_CACHE, PageContext.APPLICATION_SCOPE);
    if (bfCache != null && bfCache instanceof BeanFactory) {
        return (BeanFactory) bfCache;
    }

    Enumeration<String> en = jspContext.getAttributeNamesInScope(PageContext.APPLICATION_SCOPE);
    while (en.hasMoreElements()) {
        String attribute = en.nextElement();
        if (attribute.startsWith(FrameworkServlet.SERVLET_CONTEXT_PREFIX)) {
            Object bf = jspContext.getAttribute(attribute, PageContext.APPLICATION_SCOPE);
            if (bf != null && bf instanceof BeanFactory) {
                BeanFactory bfBean = (BeanFactory) bf;
                jspContext.setAttribute(TAGPROXY_BEANFACTORY_CACHE, bfBean, PageContext.APPLICATION_SCOPE);
                return bfBean;
            }
        }
    }

    throw new IllegalStateException(
            "Could not find a BeanFactory. Use a FrameworkServlet or @BeanFactoryReference.");
}

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