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package org.apache.taglibs.standard.lang.jstl;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.PageContext;
/**
*
* <p>This class is used to generate the implicit Map and List objects
* that wrap various elements of the PageContext. It also returns the
* correct implicit object for a given implicit object name.
*
* @author Nathan Abramson - Art Technology Group
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
**/
public class ImplicitObjects
{
//-------------------------------------
// Constants
//-------------------------------------
static final String sAttributeName =
"org.apache.taglibs.standard.ImplicitObjects";
//-------------------------------------
// Member variables
//-------------------------------------
PageContext mContext;
Map mPage;
Map mRequest;
Map mSession;
Map mApplication;
Map mParam;
Map mParams;
Map mHeader;
Map mHeaders;
Map mInitParam;
Map mCookie;
//-------------------------------------
/**
*
* Constructor
**/
public ImplicitObjects (PageContext pContext)
{
mContext = pContext;
}
//-------------------------------------
/**
*
* Finds the ImplicitObjects associated with the PageContext,
* creating it if it doesn't yet exist.
**/
public static ImplicitObjects getImplicitObjects (PageContext pContext)
{
ImplicitObjects objs =
(ImplicitObjects)
pContext.getAttribute (sAttributeName,
PageContext.PAGE_SCOPE);
if (objs == null) {
objs = new ImplicitObjects (pContext);
pContext.setAttribute (sAttributeName,
objs,
PageContext.PAGE_SCOPE);
}
return objs;
}
//-------------------------------------
/**
*
* Returns the Map that "wraps" page-scoped attributes
**/
public Map getPageScopeMap ()
{
if (mPage == null) {
mPage = createPageScopeMap (mContext);
}
return mPage;
}
//-------------------------------------
/**
*
* Returns the Map that "wraps" request-scoped attributes
**/
public Map getRequestScopeMap ()
{
if (mRequest == null) {
mRequest = createRequestScopeMap (mContext);
}
return mRequest;
}
//-------------------------------------
/**
*
* Returns the Map that "wraps" session-scoped attributes
**/
public Map getSessionScopeMap ()
{
if (mSession == null) {
mSession = createSessionScopeMap (mContext);
}
return mSession;
}
//-------------------------------------
/**
*
* Returns the Map that "wraps" application-scoped attributes
**/
public Map getApplicationScopeMap ()
{
if (mApplication == null) {
mApplication = createApplicationScopeMap (mContext);
}
return mApplication;
}
//-------------------------------------
/**
*
* Returns the Map that maps parameter name to a single parameter
* values.
**/
public Map getParamMap ()
{
if (mParam == null) {
mParam = createParamMap (mContext);
}
return mParam;
}
//-------------------------------------
/**
*
* Returns the Map that maps parameter name to an array of parameter
* values.
**/
public Map getParamsMap ()
{
if (mParams == null) {
mParams = createParamsMap (mContext);
}
return mParams;
}
//-------------------------------------
/**
*
* Returns the Map that maps header name to a single header
* values.
**/
public Map getHeaderMap ()
{
if (mHeader == null) {
mHeader = createHeaderMap (mContext);
}
return mHeader;
}
//-------------------------------------
/**
*
* Returns the Map that maps header name to an array of header
* values.
**/
public Map getHeadersMap ()
{
if (mHeaders == null) {
mHeaders = createHeadersMap (mContext);
}
return mHeaders;
}
//-------------------------------------
/**
*
* Returns the Map that maps init parameter name to a single init
* parameter values.
**/
public Map getInitParamMap ()
{
if (mInitParam == null) {
mInitParam = createInitParamMap (mContext);
}
return mInitParam;
}
//-------------------------------------
/**
*
* Returns the Map that maps cookie name to the first matching
* Cookie in request.getCookies().
**/
public Map getCookieMap ()
{
if (mCookie == null) {
mCookie = createCookieMap (mContext);
}
return mCookie;
}
//-------------------------------------
// Methods for generating wrapper maps
//-------------------------------------
/**
*
* Creates the Map that "wraps" page-scoped attributes
**/
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);
}
else {
return null;
}
}
public boolean isMutable ()
{
return true;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that "wraps" request-scoped attributes
**/
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);
}
else {
return null;
}
}
public boolean isMutable ()
{
return true;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that "wraps" session-scoped attributes
**/
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);
}
else {
return null;
}
}
public boolean isMutable ()
{
return true;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that "wraps" application-scoped attributes
**/
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);
}
else {
return null;
}
}
public boolean isMutable ()
{
return true;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that maps parameter name to single parameter
* value.
**/
public static Map createParamMap (PageContext pContext)
{
final HttpServletRequest request =
(HttpServletRequest) pContext.getRequest ();
return new EnumeratedMap ()
{
public Enumeration enumerateKeys ()
{
return request.getParameterNames ();
}
public Object getValue (Object pKey)
{
if (pKey instanceof String) {
return request.getParameter ((String) pKey);
}
else {
return null;
}
}
public boolean isMutable ()
{
return false;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that maps parameter name to an array of parameter
* values.
**/
public static Map createParamsMap (PageContext pContext)
{
final HttpServletRequest request =
(HttpServletRequest) pContext.getRequest ();
return new EnumeratedMap ()
{
public Enumeration enumerateKeys ()
{
return request.getParameterNames ();
}
public Object getValue (Object pKey)
{
if (pKey instanceof String) {
return request.getParameterValues ((String) pKey);
}
else {
return null;
}
}
public boolean isMutable ()
{
return false;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that maps header name to single header
* value.
**/
public static Map createHeaderMap (PageContext pContext)
{
final HttpServletRequest request =
(HttpServletRequest) pContext.getRequest ();
return new EnumeratedMap ()
{
public Enumeration enumerateKeys ()
{
return request.getHeaderNames ();
}
public Object getValue (Object pKey)
{
if (pKey instanceof String) {
return request.getHeader ((String) pKey);
}
else {
return null;
}
}
public boolean isMutable ()
{
return false;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that maps header name to an array of header
* values.
**/
public static Map createHeadersMap (PageContext pContext)
{
final HttpServletRequest request =
(HttpServletRequest) pContext.getRequest ();
return new EnumeratedMap ()
{
public Enumeration enumerateKeys ()
{
return request.getHeaderNames ();
}
public Object getValue (Object pKey)
{
if (pKey instanceof String) {
// Drain the header enumeration
List l = new ArrayList ();
Enumeration enum_ = request.getHeaders ((String) pKey);
if (enum_ != null) {
while (enum_.hasMoreElements ()) {
l.add (enum_.nextElement ());
}
}
String [] ret = (String []) l.toArray (new String [l.size ()]);
return ret;
}
else {
return null;
}
}
public boolean isMutable ()
{
return false;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that maps init parameter name to single init
* parameter value.
**/
public static Map createInitParamMap (PageContext pContext)
{
final ServletContext context = pContext.getServletContext ();
return new EnumeratedMap ()
{
public Enumeration enumerateKeys ()
{
return context.getInitParameterNames ();
}
public Object getValue (Object pKey)
{
if (pKey instanceof String) {
return context.getInitParameter ((String) pKey);
}
else {
return null;
}
}
public boolean isMutable ()
{
return false;
}
};
}
//-------------------------------------
/**
*
* Creates the Map that maps cookie name to the first matching
* Cookie in request.getCookies().
**/
public static Map createCookieMap (PageContext pContext)
{
// Read all the cookies and construct the entire map
HttpServletRequest request = (HttpServletRequest) pContext.getRequest ();
Cookie [] cookies = request.getCookies ();
Map ret = new HashMap ();
for (int i = 0; cookies != null && i < cookies.length; i++) {
Cookie cookie = cookies [i];
if (cookie != null) {
String name = cookie.getName ();
if (!ret.containsKey (name)) {
ret.put (name, cookie);
}
}
}
return ret;
}
//-------------------------------------
}
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