Example usage for javax.servlet.jsp PageContext getAttributeNamesInScope

Introduction

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

Prototype

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

Source Link

Document

Enumerate all the attributes in a given scope.

Usage

From source file:eionet.cr.util.Util.java

/**
 *
 * @param pageContext//from   w  w  w.ja  va  2s.c om
 * @param objectClass
 * @return
 */
public static Object findInAnyScope(PageContext pageContext, Class objectClass) {

    if (pageContext == null || objectClass == null) {
        return null;
    }

    int[] scopes = { PageContext.APPLICATION_SCOPE, PageContext.PAGE_SCOPE, PageContext.REQUEST_SCOPE,
            PageContext.SESSION_SCOPE };
    for (int i = 0; i < scopes.length; i++) {
        Enumeration attrs = pageContext.getAttributeNamesInScope(scopes[i]);
        while (attrs != null && attrs.hasMoreElements()) {
            String name = (String) attrs.nextElement();
            Object o = pageContext.getAttribute(name, scopes[i]);
            if (o != null && objectClass.isInstance(o)) {
                return o;
            }
        }
    }

    return null;
}

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From source file:org.qifu.ui.UIComponentValueUtils.java

public static Object getOgnlProcessObjectFromPageContextOrRequest(PageContext pageContext, String expression) {
    Map<String, Object> ognlRoot = new HashMap<String, Object>();
    HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
    Enumeration<String> pcNames = pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
    Enumeration<String> pNames = request.getParameterNames();
    Enumeration<String> aNames = request.getAttributeNames();
    /**/*from   w w  w  .j a v  a 2 s  .  c om*/
     * ognlRoot , ?: pageContext.getAttribute > request.getParameter > request.getAttribute
     */
    while (pcNames.hasMoreElements()) {
        String key = pcNames.nextElement();
        ognlRoot.put(key, pageContext.getAttribute(key));
    }
    while (pNames.hasMoreElements()) {
        String key = pNames.nextElement();
        if (ognlRoot.get(key) == null) {
            ognlRoot.put(key, request.getParameter(key));
        }
    }
    while (aNames.hasMoreElements()) {
        String key = aNames.nextElement();
        if (ognlRoot.get(key) == null) {
            ognlRoot.put(key, request.getAttribute(key));
        }
    }
    if (ognlRoot.size() == 0) {
        ognlRoot = null;
        return null;
    }
    Object val = null;
    try {
        val = Ognl.getValue(expression, ognlRoot);
    } catch (OgnlException e) {
        //e.printStackTrace();
    }
    ognlRoot.clear();
    ognlRoot = null;
    return val;
}

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