Examples of javax.servlet.jsp.PageContext

javax.servlet.jsp.PageContext
A PageContext instance provides access to all the namespaces associated with a JSP page, provides access to several page attributes, as well as a layer above the implementation details. Implicit objects are added the pageContext automatically.
The PageContext class is an abstract class, designed to be extended to provide implementation dependent implementations thereof, by conformant JSP engine runtime environments. A PageContext instance is obtained by a JSP implementation class by calling the JspFactory.getPageContext() method, and is released by calling JspFactory.releasePageContext().
An example of how PageContext, JspFactory, and other classes can be used within a JSP Page Implementation object is given elsewhere.
The PageContext provides a number of facilities to the page/component author and page implementor, including:
- a single API to manage the various scoped namespaces
- a number of convenience API's to access various public objects
- a mechanism to obtain the JspWriter for output
- a mechanism to manage session usage by the page
- a mechanism to expose page directive attributes to the scripting environment
- mechanisms to forward or include the current request to other active components in the application
- a mechanism to handle errorpage exception processing
Methods Intended for Container Generated Code
Some methods are intended to be used by the code generated by the container, not by code written by JSP page authors, or JSP tag library authors.
The methods supporting lifecycle are initialize() and release()
The following methods enable the management of nested JspWriter streams to implement Tag Extensions: pushBody() and popBody()
Methods Intended for JSP authors
Some methods provide uniform access to the diverse objects representing scopes. The implementation must use the underlying Servlet machinery corresponding to that scope, so information can be passed back and forth between Servlets and JSP pages. The methods are: setAttribute(), getAttribute(), findAttribute(), removeAttribute(), getAttributesScope() and getAttributeNamesInScope() .
The following methods provide convenient access to implicit objects:


  public static Map createPageScopeMap (PageContext pContext)


  {


    final PageContext context = pContext;


    return new EnumeratedMap ()


      {


  public Enumeration enumerateKeys () 


  {


    return context.getAttributeNamesInScope


      (PageContext.PAGE_SCOPE);


  }






  public Object getValue (Object pKey) 


  {


    if (pKey instanceof String) {


      return context.getAttribute


        ((String) pKey, 


         PageContext.PAGE_SCOPE);

View Full Code Here


  public static Map createRequestScopeMap (PageContext pContext)


  {


    final PageContext context = pContext;


    return new EnumeratedMap ()


      {


  public Enumeration enumerateKeys () 


  {


    return context.getAttributeNamesInScope


      (PageContext.REQUEST_SCOPE);


  }






  public Object getValue (Object pKey) 


  {


    if (pKey instanceof String) {


      return context.getAttribute


        ((String) pKey, 


         PageContext.REQUEST_SCOPE);

View Full Code Here


  public static Map createSessionScopeMap (PageContext pContext)


  {


    final PageContext context = pContext;


    return new EnumeratedMap ()


      {


  public Enumeration enumerateKeys () 


  {


    return context.getAttributeNamesInScope


      (PageContext.SESSION_SCOPE);


  }






  public Object getValue (Object pKey) 


  {


    if (pKey instanceof String) {


      return context.getAttribute


        ((String) pKey, 


         PageContext.SESSION_SCOPE);

View Full Code Here


  public static Map createApplicationScopeMap (PageContext pContext)


  {


    final PageContext context = pContext;


    return new EnumeratedMap ()


      {


  public Enumeration enumerateKeys () 


  {


    return context.getAttributeNamesInScope


      (PageContext.APPLICATION_SCOPE);


  }






  public Object getValue (Object pKey) 


  {


    if (pKey instanceof String) {


      return context.getAttribute


        ((String) pKey, 


         PageContext.APPLICATION_SCOPE);

View Full Code Here

   **/
  public Object resolveVariable (String pName,
         Object pContext)
    throws ELException
  {
    PageContext ctx = (PageContext) pContext;


    // Check for implicit objects
    if ("pageContext".equals (pName)) {
      return ctx;
    }
    else if ("pageScope".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getPageScopeMap ();
    }
    else if ("requestScope".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getRequestScopeMap ();
    }
    else if ("sessionScope".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getSessionScopeMap ();
    }
    else if ("applicationScope".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getApplicationScopeMap ();
    }
    else if ("param".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getParamMap ();
    }
    else if ("paramValues".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getParamsMap ();
    }
    else if ("header".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getHeaderMap ();
    }
    else if ("headerValues".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getHeadersMap ();
    }
    else if ("initParam".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getInitParamMap ();
    }
    else if ("cookie".equals (pName)) {
      return ImplicitObjects.
  getImplicitObjects (ctx).
  getCookieMap ();
    }


    // Otherwise, just look it up in the page context
    else {
      return ctx.findAttribute (pName);
    }
  }

View Full Code Here

      builder.append('\n');
    }
  }


    private String getContextPath() {
        PageContext context = (PageContext) getJspContext();
        return ((HttpServletRequest) context.getRequest()).getContextPath();
    }

View Full Code Here


        return wroConfig.getWroTagLibConfig().getLessPath();
    }


    private String getContextPath() {
        PageContext context = (PageContext) getJspContext();
        return ((HttpServletRequest) context.getRequest()).getContextPath();
    }

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              String errorPageURL, 
                                      boolean needsSession, int bufferSize, 
                                      boolean autoflush) 
    {
        try {
      PageContext pc;
      if( usePool ) {
    pc=(PageContext)pool.get();
    if( pc == null ) pc= new PageContextImpl(this);
      } else {
    pc =  new PageContextImpl(this);
      }


      //      System.out.println("JspFactoryImpl.getPC"  + pc);
      pc.initialize(servlet, request, response, errorPageURL, 
                          needsSession, bufferSize, autoflush);
      
            return pc;
        } catch (Throwable ex) {
            /* FIXME: need to do something reasonable here!! */

View Full Code Here

    if (prop == null)
      return null;


    context.setPropertyResolved(true);


    PageContext jspContext = (PageContext) context.getContext(JspContext.class);


    switch (prop) {
    case PAGE_CONTEXT:
      return jspContext;
      
    case PAGE_SCOPE:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        Enumeration e = jspContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, jspContext.getAttribute(name));
        }


        return map;
      }
      
    case REQUEST_SCOPE:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        ServletRequest request = jspContext.getRequest();


        Enumeration e = request.getAttributeNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, request.getAttribute(name));
        }


        return map;
      }
      
    case SESSION_SCOPE:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        HttpSession session = jspContext.getSession();


        if (session == null)
          return null;


        Enumeration e = session.getAttributeNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, session.getAttribute(name));
        }


        return map;
      }
      
    case APPLICATION_SCOPE:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        ServletContext app = jspContext.getServletContext();


        Enumeration e = app.getAttributeNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, app.getAttribute(name));
        }


        return map;
      }
      
    case PARAM:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        ServletRequest request = jspContext.getRequest();


        Enumeration e = request.getParameterNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, request.getParameter(name));
        }


        return map;
      }
      
    case PARAM_VALUES:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        ServletRequest request = jspContext.getRequest();


        Enumeration e = request.getParameterNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, request.getParameterValues(name));
        }


        return map;
      }
      
    case HEADER:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        HttpServletRequest request = (HttpServletRequest) jspContext.getRequest();


        Enumeration e = request.getHeaderNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, request.getHeader(name));
        }


        return map;
      }
      
    case HEADER_VALUES:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        HttpServletRequest request = (HttpServletRequest) jspContext.getRequest();


        Enumeration e = request.getHeaderNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();


          map.put(name, request.getHeaders(name));
        }


        return map;
      }
      
    case COOKIE:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        HttpServletRequest request
          = (HttpServletRequest) jspContext.getRequest();


        Cookie []cookies = request.getCookies();


        if (cookies == null)
          return map;


        for (int i = cookies.length - 1; i >= 0; i--) {
          map.put(cookies[i].getName(), cookies[i].getValue());
        }


        return map;
      }
    
    case INIT_PARAM:
      {
        HashMap<String,Object> map = new HashMap<String,Object>();


        ServletContext app = jspContext.getServletContext();


        Enumeration e = app.getInitParameterNames();
        while (e.hasMoreElements()) {
          String name = (String) e.nextElement();

View Full Code Here

    getFeatureDescriptors(ELContext context, Object base)
  {
    if (base != null)
      return null;


    PageContext pageContext
      = (PageContext) context.getContext(JspContext.class);


    context.setPropertyResolved(true);


    ArrayList<FeatureDescriptor> keys = new ArrayList<FeatureDescriptor>();


    Enumeration e = pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
    while (e.hasMoreElements()) {
      Object key = e.nextElement();
      String name = (String) key;


      FeatureDescriptor desc = new FeatureDescriptor();

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