/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jsp.el;
import com.caucho.el.Expr;
import com.caucho.jsp.PageContextImpl;
import com.caucho.vfs.WriteStream;
import javax.el.ELContext;
import javax.el.ELException;
import javax.servlet.ServletContext;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.PageContext;
import java.io.IOException;
import java.util.*;
public class ImplicitObjectExpr extends Expr {
final static int PAGE_CONTEXT = 1;
final static int APPLICATION_SCOPE = PAGE_CONTEXT + 1;
final static int SESSION_SCOPE = APPLICATION_SCOPE + 1;
final static int REQUEST_SCOPE = SESSION_SCOPE + 1;
final static int PAGE_SCOPE = REQUEST_SCOPE + 1;
final static int PARAM = PAGE_SCOPE + 1;
final static int PARAM_VALUES = PARAM + 1;
final static int INIT_PARAM = PARAM_VALUES + 1;
final static int HEADER = INIT_PARAM + 1;
final static int HEADER_VALUES = HEADER + 1;
final static int COOKIE = HEADER_VALUES + 1;
private String _id;
private int _index;
public ImplicitObjectExpr(String id)
{
_id = id;
if ("pageContext".equals(id))
_index = PAGE_CONTEXT;
else if ("applicationScope".equals(id))
_index = APPLICATION_SCOPE;
else if ("sessionScope".equals(id))
_index = SESSION_SCOPE;
else if ("requestScope".equals(id))
_index = REQUEST_SCOPE;
else if ("pageScope".equals(id))
_index = PAGE_SCOPE;
else if ("param".equals(id))
_index = PARAM;
else if ("paramValues".equals(id))
_index = PARAM_VALUES;
else if ("initParam".equals(id))
_index = INIT_PARAM;
else if ("header".equals(id))
_index = HEADER;
else if ("headerValues".equals(id))
_index = HEADER_VALUES;
else if ("cookie".equals(id))
_index = COOKIE;
else
throw new IllegalArgumentException();
}
public Expr createField(Expr field)
{
switch (_index) {
case APPLICATION_SCOPE:
case SESSION_SCOPE:
case REQUEST_SCOPE:
case PAGE_SCOPE:
case PARAM:
case PARAM_VALUES:
case HEADER:
case HEADER_VALUES:
case COOKIE:
case INIT_PARAM:
return new ImplicitFieldExpr(_index, field);
default:
return super.createField(field);
}
}
/**
* Evaluate the expr as an object.
*
* @param env the page context
*/
@Override
public Object getValue(ELContext env)
throws ELException
{
if (! (env instanceof PageContextImpl.PageELContext))
return null;
PageContextImpl page
= ((PageContextImpl.PageELContext) env).getPageContext();
switch (_index) {
case PAGE_CONTEXT:
return page;
case APPLICATION_SCOPE:
return new AttributeMap(page, PageContext.APPLICATION_SCOPE);
case SESSION_SCOPE:
return new AttributeMap(page, PageContext.SESSION_SCOPE);
case REQUEST_SCOPE:
return new AttributeMap(page, PageContext.REQUEST_SCOPE);
case PAGE_SCOPE:
return new AttributeMap(page, PageContext.PAGE_SCOPE);
case PARAM_VALUES:
return page.getRequest().getParameterMap();
case PARAM: {
HashMap<String,String> map = new HashMap<String,String>();
Map pMap = page.getRequest().getParameterMap();
Iterator iter = pMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String key = (String) entry.getKey();
String []value = (String []) entry.getValue();
map.put(key, value[0]);
}
return map;
}
case INIT_PARAM:
{
ServletContext app = page.getServletContext();
HashMap<String,String> map = new HashMap<String,String>();
Enumeration e = app.getInitParameterNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
map.put(name, app.getInitParameter(name));
}
return map;
}
case HEADER:
{
HttpServletRequest req = (HttpServletRequest) page.getRequest();
HashMap<String,String> map = new HashMap<String,String>();
Enumeration e = req.getHeaderNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
map.put(name, req.getHeader(name));
}
return map;
}
case HEADER_VALUES:
{
HttpServletRequest req = (HttpServletRequest) page.getRequest();
HashMap<String,String[]> map = new HashMap<String,String[]>();
Enumeration e = req.getHeaderNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
Enumeration values = req.getHeaders(name);
ArrayList<String> list = new ArrayList<String>();
while (values.hasMoreElements())
list.add((String) values.nextElement());
map.put(name, list.toArray(new String[list.size()]));
}
return map;
}
case COOKIE:
{
HashMap<String,Object> map = new HashMap<String,Object>();
Cookie []cookies = ((HttpServletRequest) page.getRequest()).getCookies();
for (int i = 0; cookies != null && i < cookies.length; i++) {
if (map.get(cookies[i].getName()) == null)
map.put(cookies[i].getName(), cookies[i]);
}
return map;
}
}
throw new UnsupportedOperationException();
}
public String toString()
{
return _id;
}
/**
* Prints the code to create an IdExpr.
*/
public void printCreate(WriteStream os)
throws IOException
{
os.print("new com.caucho.jsp.el.ImplicitObjectExpr(\"");
printEscapedString(os, _id);
os.print("\")");
}
public static class AttributeMap extends AbstractMap {
private PageContext _pageContext;
private int _scope;
AttributeMap(PageContext pageContext, int scope)
{
_pageContext = pageContext;
_scope = scope;
}
public Object get(Object key)
{
return _pageContext.getAttribute((String) key, _scope);
}
public Object put(Object key, Object value)
{
_pageContext.setAttribute((String) key, value, _scope);
return null;
}
private EntrySet _entrySet;
public Set entrySet()
{
if (_entrySet == null)
_entrySet = new EntrySet();
return _entrySet;
}
public class EntrySet extends AbstractSet {
public int size()
{
Enumeration e = _pageContext.getAttributeNamesInScope(_scope);
int i = 0;
while (e.hasMoreElements()) {
e.nextElement();
i++;
}
return i;
}
public Iterator iterator()
{
return new EntryIterator();
}
}
public class EntryIterator implements Iterator, Map.Entry {
Enumeration _e;
String _name;
Object _value;
EntryIterator()
{
_e = _pageContext.getAttributeNamesInScope(_scope);
}
public boolean hasNext()
{
return _e.hasMoreElements();
}
public Object next()
{
_name = (String) _e.nextElement();
_value = _pageContext.getAttribute(_name, _scope);
return this;
}
public void remove()
{
throw new UnsupportedOperationException();
}
public Object getKey()
{
return _name;
}
public Object getValue()
{
return _value;
}
public Object setValue(Object value)
{
_pageContext.setAttribute(_name, value, _scope);
Object oldValue = _value;
_value = value;
return oldValue;
}
public int hashCode()
{
return _name.hashCode();
}
public boolean equals(Object obj)
{
if (! (obj instanceof EntryIterator))
return false;
EntryIterator entry = (EntryIterator) obj;
return (_name.equals(entry._name) &&
(_value == null && entry._value == null ||
_value != null && _value.equals(entry._value)));
}
}
}
}